Pico™ Controller (Catalog Numbers 1760-L12AWA, -L12AWA-NC, -L12AWA-ND, -L12BWB, -L12BWB-NC, and -L18AWA) User Manual
Important User Information Because of the variety of uses for the products described in this publication, those responsible for the application and use of this control equipment must satisfy themselves that all necessary steps have been taken to assure that each application and use meets all performance and safety requirements, including any applicable laws, regulations, codes and standards.
Table of Contents Preface Who Should Use this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Purpose of this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Related Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Common Techniques Used in this Manual . . . . . . . . . . . . . . . . . . . Rockwell Automation Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . Local Product Support . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents ii Chapter 3 Commissioning Powering On Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Setting the Menu Language . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Creating a Circuit Diagram (Program) . . . . . . . . . . . . . . . . . . . . . . Starting Point: Status Display . . . . . . . . . . . . . . . . . . . . . . . . . . Circuit Diagram Display. . . .
Table of Contents Negation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Permanent Contact (Unconditional Rung) . . . . . . . . . . . . . . . Series Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Parallel Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Exclusive OR Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Motor Start/Stop Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents iv Chapter 7 Retention What is Retention? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1 Pico Models with Data Retention . . . . . . . . . . . . . . . . . . . . . . . 7-1 Retentive Markers and Function Relays . . . . . . . . . . . . . . . . . . 7-1 Setting Retention . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2 Deleting Retentive Actual Values . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents v Appendix A Specifications Physical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1 Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2 Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3 1760-L12AWA, -L12AWA-NC, -L12AWA-ND, and 1760-L18AWA. . . . . . . . . . . . .
Table of Contents vi Publication 1760-UM001A-EN-P
Preface Read this preface to familiarize yourself with the rest of the manual. It provides information concerning: • who should use this manual • the purpose of this manual • related documentation • conventions used in this manual • Rockwell Automation support Who Should Use this Manual Use this manual if you are responsible for designing, installing, programming, or troubleshooting control systems that use Pico controllers.
Preface P-2 Common Techniques Used in this Manual The following conventions are used throughout this manual: • Bulleted lists such as this one provide information, not procedural steps. • Numbered lists provide sequential steps or hierarchical information. • Italic type is used for emphasis.
Chapter 1 System Overview Overview Pico is an electronic control relay with built-in logic, timer, counter, and real-time clock functions. Pico is a control and input device rolled into one that can perform many different tasks in building and machine applications. Pico is programmed using ladder diagrams, and each programming element is entered directly via the Pico display.
1-2 System Overview Hardware Versions 1 7 2 Del Alt 3 4 8 Esc 7 Del Ok 5 Alt 8 Esc 6 Ok 5 8 3 5 Item 1 2 3 4 5 6 7 8 Description Incoming Power Inputs Status LED Buttons Socket for memory module or PC interface cable Outputs LCD display Write-On Surface Pico controllers are available for both 120/240V ac and 24V dc operation and come in both 12-I/O and 18-I/O sizes. Pico is available with and without a real-time clock, and a version is available without a display and keypad.
System Overview Operating Principles 1-3 Operating Buttons Del Alt Esc Ok Button Del Alt Cursor Buttons Ok Esc Function Delete object in the circuit diagram Special functions in the circuit diagram Move cursor Select menu item Choose contact numbers, values, times, etc. Next menu level, store your entry Previous menu level, cancel your entry Using Menus to Choose Values Press Del To Show system menu and Alt together Ok • Go to next menu level. • Select menu item. • Store your entry.
1-4 System Overview Selecting the Main and System Menus Figure 1.1 1760-L12xxx Status Display Inputs I12345678 MO 12:50 Outputs Q1234 On RUN Weekday Time RUN/STOP Mode Off Figure 1.2 1760-L18AWA Status Display Inputs Weekday/Time Outputs 12........... MO 02:00 ..34.... RUN RUN/STOP Mode Inputs 1 and 2 ON Outputs 3 and 4 ON Figure 1.3 1760-L18AWAAdvanced Display 12...6.89..
System Overview 1-5 Menu Structure Figure 1.4 Main Menu Without Optional Password Protection STOP: Circuit diagram menu RUN: Power flow display PROGRAM... RUN PARAMETER SET CLOCK RUN Circuit Diagram STOP PROGRAM DELETE PROG CARD ... PROGRAM... RUN PARAMETER SET CLOCK PROGRAM... RUN PARAMETER SET CLOCK Parameters PROGRAM DELETE PROG CARD ... PROGRAM DELETE PROG CARD ... PROGRAM...
1-6 System Overview Figure 1.5 Main Menu with Password Protection Main Menu PASSWORD... Unlock Password Entry Password RUN PARAMETER SET CLOCK PASSWORD...
System Overview 1-7 Figure 1.6 System Menu Password Entry System PASSWORD... SYSTEM GB D F E I . Set Password Password Password Entry Change Password CHANGE PW ACTIVATE Password CHANGE PW ACTIVATE PASSWORD... SYSTEM GB D F E I . DEBOUNCE OFF P ON STOP MODE DEBOUNCE OFF DEBOUNCE ON DEBOUNCE OFF P ON STOP MODE P ON P OFF DEBOUNCE OFF P ON STOP MODE DEBOUNCE OFF P ON STOP MODE (2) RETENTION ON PASSWORD... SYSTEM GB D F E I .
1-8 System Overview Selecting or Toggling Between Menu Items Cursor up or down PROGRAM ... RUN PARAMETER SET CLOCK ..
Chapter 2 Installation Pico is installed in the following order: • Mounting • Using surge suppressors • Wiring the inputs • Wiring the outputs • Connecting the incoming power Prevent Electrical Shock ATTENTION Follow these guidelines when you handle the controller: ! • Remove power before working on any of the wiring to Pico. • Touch a grounded object to discharge static potential. • Wear an approved wrist-strap grounding device. • If available, use a static-safe work station.
2-2 Installation by EN 50178, see the appropriate sections in this publication, as well as the Allen-Bradley publication Industrial Automation Wiring and Grounding Guidelines For Noise Immunity, publication 1770-4.1. This equipment is classified as open equipment and must be mounted in an enclosure during operation to provide safety protection.
Installation 2-3 Using a Mounting Plate To install unit using mounting screws: 1. Snap the mounting feet in place. 2. Drill holes at the mounting feet positions, shown below. 3. Mount the controller. Click 1760-L12xxx 1760-L18AWA For mounting dimensions, see Dimensions on page A-8. Wiring Terminals Required Tools Slot-head screwdriver (width: 3.5 mm, torque: 0.57 to 0.
2-4 Installation Connecting the Incoming Power For technical specifications of incoming power, refer to Appendix A. Figure 2.1 1760-L12AWA, -L12AWA-NC, -L12AWA-ND, -L18AWA L1 L2 F1 L1 L2 I1 I2 120/240V ac 50/60Hz I3 I4 I5 I6 I7 I8 Inputs x 120/240V ac ELECTRICAL SHOCK HAZARD ATTENTION The memory module and PC-cable socket are at the potential of L2. There is a danger of electric shock if L2 is not grounded. Do not make contact with electrical components under the socket cover.
Installation 2-5 Wiring Protection Both AC and DC versions require wiring protection (F1) rated for at least 1 A (slow). When the unit is powered on for the first time, the power supply circuit draws a larger surge current than usual. Use an appropriate device for switching on the incoming power and do not use any reed relay contacts or proximity switches.
2-6 Installation characteristic of the particular inductive device. See the table on page 2-7 for recommended suppressors. Surge Suppression for Inductive ac Load Devices Output Device Varistor Output Device RC Network Output Device Surge Suppressor For inductive dc load devices, a diode is suitable. A 1N4004 diode is acceptable for most applications. A surge suppressor can also be used. See the table on page 2-7 for recommended suppressors.
Installation 2-7 Recommended Surge Suppressors Use the Allen-Bradley surge suppressors shown in the following table for use with relays, contactors, and starters.
2-8 Installation Connecting AC Inputs ATTENTION For Pico controllers with ac inputs, connect the inputs to the same phase as the power feed L1, in accordance with VDE, IEC, UL and CSA safety regulations. Otherwise, Pico may not detect the switching level or, it may be damaged by excess voltage. ! L1 L2 F1 L1 L2 120/240V ac 50/60Hz I1 I2 I3 I4 I5 I6 I7 I8 Inputs x 120/240V ac Connect inputs to push-buttons, switches, relays, or contacts.
Installation 2-9 Two-wire proximity sensors have a residual off-state leakage current. If this residual current is too high, the input may indicate the input is ON when the device is actually off. Use inputs I7 and I8 for these types of input devices. If more inputs are required, use a bleeder resistor or bleeder capacitor for inputs I1 through I6, and I9 through I12.
2-10 Installation Connecting DC Inputs Use input terminals I1 to I8 to connect push-button, switches, or 3 or 4-wire proximity switches. Given the high off-state leakage current, do not use 2-wire proximity switches. Input Specification Input Signal Voltage Range OFF signal: 0 to 5V dc ON signal: 15V to 28.8V dc Input Current I1 to I6: 3.3 mA at 24V dc I7 and I8: 2.
Installation 2-11 signals. In this case, only ground the cable at one end. Do not route signal lines parallel to power cables. Connect inductive loads to be switched via Pico outputs to a separate power feed, or use a suppressor circuit for motors and valves. If loads such as motors, solenoid valves or contactors are operated via the same power feed, switching may result in interference on the analog input signals. The following four circuits contain application examples for analog value processing.
2-12 Installation Figure 2.3 . Setpoint Potentiometers +24V 0V F1 ~ 0V +24 V COM I1 24V dc I2 I3 I4 I5 I6 I7 +12V I8 Inputs x 24V dc (I7,I8 0 to 10V) Use a potentiometer with a resistance of less than or equal to 1K Ω, e.g. 1K Ω, 0.25W. Figure 2.4 Light Intensity Sensors +24V 0V ~ 12V 0 to 10V F1 0V 0V +24 V COM I1 24V dc I2 I3 I4 I5 I6 I7 +12V I8 Inputs x 24V dc (I7,I8 0 to 10V) Figure 2.
Installation 2-13 Figure 2.6 20 mA Sensors . +24V 0V 1A 4 to 20 mA 500Ω +24 V COM 24V dc I1 I2 I3 I4 I5 I6 I7 I8 Inputs x 24V dc (I7,I8 0 to 10V) Connect 4 to 20 mA (0 to 20 mA) sensors using an external 500Ω resistor, as shown above. The resultant impedance to the sensor is then approximately 478 Ω. The following values result (Based on V = R x I = 478Ω x 10 mA = 4.8V dc): • 4 mA = 1.9V dc • 10 mA = 4.8V dc • 20 mA = 9.
2-14 Installation Connecting Relay Outputs Figure 2.7 1760-L12AWA-xx and 1760-L12BWB-xx . 1 2 Q1 10 000 000 1 2 1 2 Q3 Q2 1 2 L R Q4 24 V 120 V 240 V 8A 8A 8A 2A 2A 2A 1000 W 0V ,N 10 x 58 W 25.000 < 8 A / B 16 L1, L2, L3 (120/240V) + 24 V Figure 2.8 1760-L18AWA 1 2 Q1 10 000 000 1 2 Q2 1 2 Q3 1 2 1 2 Q4 Q5 1 2 Q6 R 8A 8A 8A 24 V 120 V 240 V 2A 2A 2A 1000 W 0V ,N 10 x 58 W 25.
Chapter 3 Commissioning Powering On Unit Before powering up Pico, check that you have connected the power supply terminals and inputs correctly: 24V dc version: • +24V terminal: +24V dc voltage • COM terminal: 0V voltage • terminals I1 to I8: actuation via +24V dc 120/240V ac version • terminal L1: phase conductor L1 • terminal L2: neutral conductor L2 (grounded) • terminals I1 to I12: actuation via phase conductor L1 If you have already integrated Pico into a system, secure any parts of the system con
3-2 Commissioning Press Ok to confirm your choice or press Esc to exit the menu. The unit then switches to the status display. You can also change the language setting at a later date, see Chapter 7 for more information. If you do not set the language, Pico displays this menu and waits for you to select a language every time the unit is powered up. Operating Modes Pico has two operating modes - Run and Stop.
Commissioning Creating a Circuit Diagram (Program) 3-3 The following small circuit diagram example takes you step-by-step through programming your first Pico circuit diagram. This example demonstrates most of the basic programming rules. As with conventional wiring, you use contacts and relays in the Pico circuit diagram. With Pico, however, you no longer have to connect components individually. With the push of a few buttons, the Pico circuit diagram produces all the wiring.
3-4 Commissioning Starting Point: Status Display When you power up the unit, it opens the status display immediately to show the state of the inputs and outputs. It also indicates whether Pico is already running a program. 1760-L12xxx 1760-L18AWA .............. I1 2 34 5 6 7 8 MO 13:24 Q1234 STOP MO 02:00 ......... STOP Press Ok to switch to the main menu. You can then press Ok to move forward to the next menu level or Esc to go back one level.
Commissioning 3-5 From the First Contact to the Output Coil With Pico, you work from the input to the output. 1. The first input contact is I1. Press Ok. Pico inserts the first contact I1 at the cursor position. I1 The “I” flashes and can be changed, for example, to a “P” for a button input using the up or down cursor buttons. However, nothing needs to be changed at this point. 2. Press Ok twice to move the cursor across the 1 to the next contact field.
3-6 Commissioning Wiring Inside of Your Program Pico displays a small arrow when creating a circuit connection. Pressing Alt activates the arrow and the cursor buttons to move it. Alt also has two other functions: • From the left contact field, press Alt to insert a new, empty circuit connection (rung). • Press Alt to set the contact currently under the cursor to either a make or break contact. The wiring arrow works between contacts and relays.
Commissioning 3-7 Testing the Circuit Diagram 1. Switch to the main menu and select the RUN menu option (press ESC to go back to the Main Menu and use the arrow keys to highlight RUN). 2. Toggle between RUN and STOP to set the operating mode required (use the OK button to toggle between RUN and STOP). PROGRAM... RUN PARAMETER SET CLOCK... Pico is in Run mode if the STOP menu option is displayed. Menu options that toggle between two functions always show the next possible setting.
3-8 Commissioning Deleting a Circuit Diagram 1. Switch Pico to Stop mode. The RUN option is displayed. Pico must be in Stop mode in order to extend, delete or modify the program. 2. Select “PROGRAM”. Press OK to switch from the main menu to the next menu level. 3. Select “DELETE PROG” Pico displays the prompt “DELETE?”. PROGRAM DELETE PROG 4. Press Ok to delete the program or Esc to cancel. 5. Press Esc to return to the Main Menu.
Chapter 4 Drawing a Circuit Diagram with Pico By working through the example, Creating a Circuit Diagram (Program) on page 3-3, you should now have gained an initial impression on how to create a program in Pico. This chapter describes the full range of Pico functions and provides further examples of how to use Pico. Pico Operation Buttons for Drawing Circuit Diagrams Press To Delete branch, contact, relay, or empty rung in the circuit diagram.
4-2 Drawing a Circuit Diagram with Pico Button Operation The cursor buttons in the Pico circuit diagram perform three functions. The current mode is indicated by the appearance of the flashing cursor: • Move • Enter • Connect In Move mode, you can use the arrow keys to move the cursor around the circuit diagram in order to select a branch, contact or relay coil. Use Ok to switch to Enter mode so that you can enter or change a value at the current cursor position.
Drawing a Circuit Diagram with Pico 4-3 Contacts Contacts are used to modify the flow of current in the circuit diagram. Make contacts carry are on when closed and off when open. Contacts in the circuit diagram are either make or break contacts.
4-4 Drawing a Circuit Diagram with Pico Relays Pico has nine different types of relay for use in a circuit diagram.
Drawing a Circuit Diagram with Pico Contact Fields Circuit connections/ rungs 4-5 Coil Field I1 -I2 -T1 -{Q1 Q1 - 1 Connections Connections are used to produce the electrical continuity between relay contacts and the coil. Connections can be created across several rungs. Each point of intersection is a connection.
4-6 Drawing a Circuit Diagram with Pico Working with Contacts and Relays In Pico circuit diagrams, the switches, buttons, and relays of conventional relay logic are connected using input contacts and relay coils. S1 CR1 Connect S1 to Pico input terminal I2 Connect S2 to Pico input terminal I3 Connect load M1 to Pico output Q4 S1 or S2 switches on M1. S2 I2----------{Q4 I3 M1 CR1 Pico Circuit Diagram First, specify which input and output terminals you wish to use in your circuit.
Drawing a Circuit Diagram with Pico 4-7 . Change I1 to I2 in the Change {Q1 to {Q8 in the coil contact field field I1 Q M or OK C T P D S : R I1 2 3 4 5 . . . 16 {Q1 I2 S R {Q1 {Q1 2 M 3 T or . OK C . D . S : 8 {Q8 or OK or OK Pico leaves the Enter mode when you press the left or right arrow keys or Ok. Deleting Contacts and Relay Coils 1. Move the cursor using the arrow buttons to a contact or coil field. 2. Press Del. The contact or the relay coil is deleted, together with any connections.
4-8 Drawing a Circuit Diagram with Pico Creating and Modifying Connections Relay contacts and relay coils are connected in Connect mode using the diagonal wiring arrow (available in this mode). Use the arrow buttons to move the cursor onto the contact field or coil field from which you wish to create a connection. Do not position the cursor on the first contact field. At this position, the Alt button has a different function (Insert circuit connection). 1. Press Alt to switch to Connect mode. 2.
Drawing a Circuit Diagram with Pico 4-9 Inserting and Deleting a Circuit Connection The LCD display shows four of the 41 or 121 circuit connections in the display at the same time. Pico automatically scrolls the display up or down to show hidden circuit connections—even empty ones—if you move the cursor past the top or bottom of the display. A new circuit connection is added below the last connection or inserted above the cursor position: 1.
4-10 Drawing a Circuit Diagram with Pico Example 2 Input “I1” is used to control output “Q1”. Input I5 switches to Cursor button mode and deactivates circuit connection I1 via M1. IMPORTANT I5---------{M1 I1-M1------{Q1 P1-M1 The P-Buttons are only recognized as switch contacts in the Status menu, and not in the any other display. The Status menu display shows whether the P-Buttons are used in the circuit diagram. I12345678 P2 MO Q1234 Display P P2 P- 01:00 STOP .............. P2 MO 02:00 .......
Drawing a Circuit Diagram with Pico 4-11 Switch on I3. I2---------{Q4 In the power flow display, current-carrying connections are thicker than those that are not powered. I3--- You can follow a current-carrying connection across all circuit connections by scrolling the display up and down. The power flow display will not show signal fluctuations in the millisecond range. This is due to the inherent delay factor of LCD displays.
4-12 Drawing a Circuit Diagram with Pico Rules for Wiring Relay Coils Use the output energize or “flip-flop” function once only for each relay coil. Use the “latch” and “unlatch” functions to control each relay coil - the first to set it (S) and the second to reset it (R). Figure 4.1 Relays with Output Energize Function The output signal follows immediately after the input signal, and the relay acts as a contactor.
Drawing a Circuit Diagram with Pico 4-13 Representation in Pico: Instruction Type Output Relay Q: Representation in Pico Q1… Q6 (depending on type) Marker Relay M: M1… M16 Text Display Relay D: D1… D8 (1760-L18AWA) Marker Relay (S marker): S1… S8 (1760-L18AWA) A coil automatically turns off if the power fails or if Pico is in Stop mode. Exception: Retentive coils retain signal 1 (see Chapter 7). Figure 4.3 Latching Relay The “latch” and “unlatch” relay functions are used in pairs.
4-14 Drawing a Circuit Diagram with Pico IMPORTANT Function Relay Types A latched relay is automatically switched off if the power fails or if the device is in Stop mode. Exception: Retentive coils retain signal 1 (see Retention on page 7-1). The function relays are used to simulate some of the devices used in conventional relay control systems.
Drawing a Circuit Diagram with Pico Example with Timing and Counter Relays 4-15 A warning light flashes when the counter reaches 10. Hard-Wiring with Relays CNTR1 Count S1 S2 Reset T1 CNTR1 2.00 sec PL1 T1 R +24V 0V F1 S1 S2 I5---------CC1 I6---------RC1 +24 V C1---------TT1 T1---------{Q1 1 com I5 I6 2 Q1 M1 0V Using Circuit Diagram Forms You can use the circuit diagram form on page B-1of this manual for planning and preparing your Pico circuit diagrams.
4-16 Drawing a Circuit Diagram with Pico Customer: Date: J. Smith Ltd.
Drawing a Circuit Diagram with Pico J. Smith Ltd.
4-18 Drawing a Circuit Diagram with Pico 1. Enter the circuit diagram up to “C1” in the third circuit connection. I5----------CC1 I6----------RC1 C1 is the contact of counter relay 1. If the cursor is on the contact number, Pico will call up the parameter display when you press Ok. C1 2. Move the cursor onto the 1 in C1 and press Ok. The parameter set for the counter is displayed. 3. Change the counter setpoint to 10: Use the left and right buttons to move the cursor onto the tens digit.
Drawing a Circuit Diagram with Pico 4-19 If the actual and setpoint values are the same, the timing relay switches the warning light on and off every 2 seconds. Doubling the flashing frequency: • Select T1 in the power flow display and change the setpoint time to 01.00. When you press Ok, the warning light flashes at twice the frequency. S { 01.23 01.00 TRG RES T1 + Protecting Timer and Counter Settings You can also modify parameter settings via the PARAMETER menu option.
4-20 Drawing a Circuit Diagram with Pico At least two elements are needed in the circuit diagram for a timing relay: • A relay contact in the contact field, in this case T2. Task: Turn on output Q1 1.5 min. after actuation via I1. Disable T2 via I2. • A trigger coil in the coil field, in this case TT2. Circuit Diagram: You can also wire up the reset coil RT2 if you wish to use an external reset signal. Enter the number of the relay contact T2 and press Ok.
Drawing a Circuit Diagram with Pico 4-21 Minimum time setting with 1760-L12xxx: 40 ms and 1760-L18AWA: 80 ms. A time value less than the maximum scan time of the Pico controllers may cause uncontrolled switching states. Time units and setpoint time parameters S 00.00 Seconds 10 x milliseconds, 00.00 to 99.99 M:S 00:00 Minutes: seconds, 00:00 to 99:59 H:M 00:00 Hours: minutes, 00:00 to 99:59 Resolution 10 ms 1s 1 min.
4-22 Drawing a Circuit Diagram with Pico Timing Relays, Off-Delayed With and Without Random Switching The relay switches a contact immediately and then resets it after the setpoint delay has elapsed. With random switching, the relay contact switches randomly at any time up to the specified time value (shown shaded in figure). ? Figure 4.5 Timing Diagram Trigger Reset On On On Output t A B t C The trigger coil switches the contact.
Drawing a Circuit Diagram with Pico 4-23 Timing Relays, Single Pulse The relay switches a contact for a time equal to the delay time set, regardless of the length of the trigger signal. Figure 4.6 Signal Diagram : On Trigger On Reset On Output t t The reset coil has priority over the trigger coil and resets the relay contact before the time has elapsed. If the time is set to zero, the contact is set for the duration of one program scan.
4-24 Drawing a Circuit Diagram with Pico Figure 4.7 Signal Diagram : On Trigger On Reset On Output t t t The trigger coil enables the flashing on and off. The flashing period starts with switch position “off”. The reset coil has priority over the trigger coil and always resets the relay contact. If the time is set to zero, the flash frequency changes with the cycle time. The cycle time varies according to the length of the circuit diagram.
Drawing a Circuit Diagram with Pico 4-25 Figure 4.8 Signal Diagram: Count On CCx On Direction DCx A Reset RCx 8 6 4 2 0 Output B C D On 7 5 3 1 On The relay contact of a counter with setpoint value 6 switches when the actual value is 6 (A). If the counting direction is reversed (B), the contact switches off when the actual value is 5. Without a counting pulse, the actual value is retained (C). The reset coil resets the counter to 0 (D).
4-26 Drawing a Circuit Diagram with Pico You can wire up coils RC1 and DC1 as required. Select relay contact C1, move the cursor to 1 and press Ok. The parameter set for counter relay C1 is displayed. I1---------CC1 I3---------DC1 I2---------RC1 C 1 --------{Q1 Determining Counter Frequency The maximum counter frequency depends on the length of the circuit diagram in Pico.
Drawing a Circuit Diagram with Pico 4-27 Values between 0000 and 9999 are possible. Parameter DIR Coil function D CNT RES C R Meaning Counting direction DCx=0: count up DCx=1: count down Counting pulse Reset The symbol “{” before DIR, CNT and RES indicates whether the coil function is programmed in the circuit diagram. Parameters displayed via the PARAMETER menu option + Access enabled Access disabled The actual value is only displayed in Run mode.
4-28 Drawing a Circuit Diagram with Pico Example 1 Time switch 1 turns on Monday through Friday between 6:30 am and 9:00 am and between 5:00 pm and 10:30 pm. MO-FR MO-FR ON OFF 1 A + 06:30 09:00 ON OFF 1 B 17:00 22:30 + Figure 4.9 Signal Diagram: MO TU WE TH FR SA SU A on B on Output on Example 2 Time switch 2 turns on at 4:00 pm on Friday and switches off at 6:00 am on Monday. MO FR ON OFF 2 A 16:00 --:-- + ON OFF --:-06:00 Figure 4.
Drawing a Circuit Diagram with Pico 4-29 Example 3 Time switch 3 turns on overnight at 10:00 pm on Monday and switches off at 6:00 am on Tuesday. MO 3 D 22:00 06:00 ON OFF + Figure 4.11 Signal Diagram: MO TU D on on Output IMPORTANT If the Off time is before the On time, Pico will switch off on the following day. Example 4 The time settings of a time switch can overlap. The clock turns on at 4:00 pm on Monday, whereas on Tuesday and Wednesday it turns on at 10:00 am.
4-30 Drawing a Circuit Diagram with Pico Example 5 The power to Pico is removed between 3:00 pm and 5:00 pm. The relay drops out and remains off, even after the power returns, since the first switch-off time was at 4:00 pm. MO-SU MO-SU ON OFF 12:00 16:00 4 A + ON OFF 12:00 18:00 4 B + When it is powered on, Pico always updates the switching state on the basis of all the available switching time settings. Example 6 The time switch is to operate for 24 hours.
Drawing a Circuit Diagram with Pico 4-31 Parameters for Time Switch A time switch has four sets of parameters, one for each channel (A, B, C and D). These are used to set the day of the week and the turn-on and turn-off times for the desired channels and to enable or disable parameter access. Changing the switching times is described under Chapter 7. You can only change the “+”/“–” setting for displaying the parameters via the PARAMETER menu option when you are editing the circuit diagram.
4-32 Drawing a Circuit Diagram with Pico Both the setpoint value and the actual value correspond to the measured voltages. The resolution of the voltage values from 0.0 to 10.0V dc is in 0.1V steps. If the voltage at the input terminal is in the range of 10 to 24V dc, the comparator value stays at 10.0V dc. You can enter the setpoint values for a comparison while you are creating the circuit diagram or in the parameter display in Run mode. Typical application: • Evaluating the analog values of sensors, e.
Drawing a Circuit Diagram with Pico IMPORTANT 4-33 Analog signals of sensors typically fluctuate by several millivolts. For stable set and reset switching, the setpoints should differ by at least 0.2V (switching hysteresis). ATTENTION ! To prevent the uncontrolled switching of the relay coils only use the Set and Reset functions with the analog comparators. Programming Analog Comparators You integrate an analog comparator into your program in the form of a contact.
4-34 Drawing a Circuit Diagram with Pico Parameter Sets for Analog Comparators The parameter display for analog comparators can be used to set the comparison greater than or equal to, or less than or equal to, and to enable or disable the parameter access. ANALOG Input I7 I7 Compare Function Input I8 Current I7 Value 8.0 V A1 I8 4.2 V + Relay Number Parameter Display Current I8 Value If you want to compare an input with a setpoint value, you must also set the setpoint value.
Drawing a Circuit Diagram with Pico 4-35 Circuit Diagram Elements Text Display Contacts Make contact D Break contact D Numbers 1 to 8 Coils D Numbers 1 to 8 Coil functions {, S, R LCD Display Up to 12 characters per line and up to 4 lines can be displayed. Variables Actual values and setpoints of timing relays and counters, as well as the current time, can be displayed in lines 2 or 3, characters 5 to 8 (characters 5 to 9 for time display).
4-36 Drawing a Circuit Diagram with Pico The following applies to D1: D1 is designed as an alarm text and takes precedence over all other text displays. If D1 is activated, the text assigned to it is displayed until: • The coil D1 is reset to 0 • Stop mode is selected • The Pico power supply is switched off • The Ok or Del + Alt buttons are used to switch to a menu Text Entry Text entry is only possible using PicoSoft version 2.1 and higher.
Drawing a Circuit Diagram with Pico Jumps 4-37 The 1760-L18AWA allows the use of jumps. Jumps can be used to optimize the structure of a program or to implement the function of a selector switch. Jumps can be used for example to select whether manual/automatic operation or other machine programs are to be set. Jumps consist of a jump location and a jump destination (label).
4-38 Drawing a Circuit Diagram with Pico Power Flow Display Jumped ranges are indicated by the coils in the power flow display. All coils after the jump coil are shown with the symbol of the jump coil. Example A selector switch allows two different sequences to be set. • Sequence 1: Switch on Motor 1 immediately. • Sequence 2: Switch on Guard 2, Wait time, then switch on Motor 1.
Drawing a Circuit Diagram with Pico Example Programs 4-39 The Pico circuit diagram is created using ladder logic. This section contains a few programs intended to demonstrate possibilities for your own circuit diagrams.
4-40 Drawing a Circuit Diagram with Pico Logic Table I1 0 1 0 1 0 1 0 1 I2 0 0 1 1 0 0 1 1 I3 0 0 0 0 1 1 1 1 Q1 0 0 0 0 0 0 0 1 Q2 1 0 0 0 0 0 0 0 Parallel Connection Q1 is controlled by a parallel circuit consisting of three make contacts (OR circuit). I1----------{Q1 A parallel circuit of break contacts controls Q2.
Drawing a Circuit Diagram with Pico 4-41 Motor Start/Stop Circuit A combination of a series and parallel connection is used to wire a latching circuit. Latching is established by contact Q1 which is parallel to I1. If I1 is actuated and reopened, the current flows via contact Q1 until I2 is actuated.
4-42 Drawing a Circuit Diagram with Pico Make sure that both coils are wired up in the correct order in the Pico circuit diagram: first wire the “S” coil and then the “R” coil. This means that the machine will be switched off when I2 is actuated, even if I1 is switched on. Flip-Flop Relay A flip-flop relay is often used for controlling lighting such as for staircase lighting. Press the push button wired to I1 once and the lights turn on. Press the push button again and the lights turn off.
Drawing a Circuit Diagram with Pico 4-43 Count Up Counter The count up counter keeps track of a given number of events. Once its preset number of counts is reached, the counter energizes an output. This can be used for keeping track of reject parts. Once the reject parts bin contains 20 parts, the bin is emptied by energizing an output. The counter is reset by a second input. Each time I1 is energized, counter C1 adds one to its counter. I1 must be de-energized before C1 recognizes another count.
4-44 Drawing a Circuit Diagram with Pico Function Pulse 1 2 3 4 5 Reset = 1 Value Storage location 1 0 0 1 0 1 1 0 0 1 0 0 2 0 1 0 0 1 0 3 0 0 1 0 0 0 4 0 0 0 1 0 0 Assign the meaning “bad part” to the value 0. This ensures that no bad parts will be reused if the shift register is accidentally deleted.
Drawing a Circuit Diagram with Pico 4-45 How Does the Shift Register Work? The shift pulse is switched on for exactly one cycle. To do this, the shift pulse is generated by evaluating the change from I1 “off” to I1 “on” - the rising edge. This allows the shift register to only shift once regardless of how long I1 remains true. When I1 is switched on for the first time, marker relay contact M7 is off and the break contact is closed during the first pass through the program.
4-46 Drawing a Circuit Diagram with Pico How can the value of a storage position be transferred? Use the make or break contact of storage positions M1 to M4 and program them to an output relay or in the circuit diagram according to the task required. Running Light An automatic running light can be created by slightly modifying the shift register circuit. One output is always switched on. It starts at Q1, runs through to Q4 and then starts again at Q1.
Drawing a Circuit Diagram with Pico 4-47 The enhanced version of this program turns the lights off again after 4 hours if the push button was held for more than 2 seconds rather than leaving them on indefinitely. Activation Button pressed briefly Effect on Lighting Light ON or OFF. Lights will turn off automatically after 6 minutes.
4-48 Drawing a Circuit Diagram with Pico Publication 1760-UM001A-EN-P
Chapter 5 Saving and Loading Circuit Diagrams Interface to Memory Module and Programming Cable The Pico controller has a covered interface. You can either use the Pico interface to save programs to a memory module or use PicoSoft programming software and the interface cable to transfer them to a PC. A Pico controller without a display (1760-L12AWA-ND) can be loaded with a program via PicoSoft or automatically from a memory module every time power is applied.
5-2 Saving and Loading Circuit Diagrams Memory Module The following memory modules are available as Pico accessories. Pico Controller 1760-L12xxx 1760-L18AWA Memory Module 1760-MM1 1760-MM2 Programs including all relevant data can be transferred from the 1760-MM1 memory module to the 1760-L18AWA. It is not possible to transfer a program from the 1760-L18AWA to the 1760-MM1. The 1760-MM2 does not fit in any of the 1760-L12xxx controllers. Each memory module can hold one Pico program.
Saving and Loading Circuit Diagrams 5-3 Loading or Storing Programs You can only transfer programs in Stop mode. NOTE The no-display model, 1760-L12AWA-ND, can be loaded with a program automatically from the memory module every time it is powered up. Simply insert a memory module into the interface of a 1760-L12AWA-ND and apply power to the controller. Pico will automatically read the program from the memory module and go into the RUN mode.
5-4 Saving and Loading Circuit Diagrams Loading a Circuit Diagram from the Memory Module 1. Select the “CARD-> DEVICE” menu option. > CARD -> DEVICE 2. Press Ok if you want to delete the Pico program and replace it with the memory module program. DEVICE - 3. Press Esc to cancel. DELETE CARD If a problem occurs during the operation, Pico displays the message “INVALID PROG”.
Saving and Loading Circuit Diagrams 5-5 Connecting Pico to the PC ATTENTION ELECTRICAL SHOCK HAZARD ! Only use the 1760-CBL-PM02 cable with the Pico units. Use of another cable may place the user in danger of electrical shock. 1. Connect the PC cable to the serial PC interface. 2. Insert the Pico plug in the open interface. 3. Activate the status display on the Pico. Pico cannot exchange data with the PC while in any other display mode.
5-6 Saving and Loading Circuit Diagrams IMPORTANT If the power fails during communication with the PC, repeat the last procedure. It is possible that not all the data was transferred between the PC and Pico. • After transmission, remove the cable and close the cover.
Chapter 6 Pico System Settings You can modify system settings on Pico models equipped with keypad and an LCD display, or by using PicoSoft (v2.1 and higher). Password Protection The Pico circuit diagram, function relay settings, and system parameters can be password protected. In this case, the password consists of a value between 0001 and 9999. The number combination 0000 is used to delete a password.
6-2 Pico System Settings Setting the Password Passwords can be set in the System menu in both Run or Stop operating modes. If, however, a password is already activated, you cannot change to the System menu. 1. Press Del and Alt to call up the System menu. 2. Select the menu item “PASSWORD...” to enter the password. If a password has not been entered already, Pico will switch directly to the password display and show four dashes: no password set. ENTER PW ---- 3.
Pico System Settings IMPORTANT 6-3 Make a note of the password before you activate it. If the password entry is no longer known, Pico can still be unlocked, however, the circuit diagram and other settings are deleted. 3. Select “ACTIVATE” and press Ok. The password is now active. Pico automatically returns to the Status display. You must unlock Pico using the password before you can edit a circuit diagram or enter the System menu. Unlocking Pico Unlocking Pico deactivates the password.
6-4 Pico System Settings Changing or Deleting a Password 1. Press Del and Alt to call up the System menu. 2. Open the password menu via the menu item “PASSWORD...”. 3. The “CHANGE PW” entry flashes. Pico only shows this menu if a password is present. CHANGE PW ACTIVATE 1. Press Ok to enter password entry menu. 2. Use the left or right arrow to move to the 4-digit entry field. 3. Modify the four password digits using the cursor buttons. ENTER PW ---- 4. Confirm with Ok. 5.
Pico System Settings Changing the Menu Language 6-5 Catalog numbers 1760-L12xxx provide five menu languages and catalog number 1760-L18AWA provides ten. These can be set as required via the System menu.
6-6 Pico System Settings The following requirements must be fulfilled for a parameter set to be displayed: • a function relay must have been included in the circuit diagram • the parameter set has been enabled for access, indicated by the “+” character at the bottom right of the display. Use the PARAMETER menu to access and modify accessible parameter sets. Parameter sets for which access is not enabled are not displayed. Pico therefore allows you to protect parameters with the use of a password.
Pico System Settings 6-7 Example: Modifying Switching Times for Outside Lighting The outside lighting of a building is automatically switched on from 19:00 to 23:30 (7:00 pm to 11:30 pm) Mondays to Fridays in the Pico program. The parameter set for the time switch function relay 1 is saved in channel “A” and looks like this. The outside lighting is now required to also turn on between 19:00 and 22:00 on Saturdays. MO-FR ON OFF 15:20 19:00 23:30 1 A + 1. Select PARAMETER from the main menu.
6-8 Pico System Settings Setting the Time If the clock is not set yet or if Pico is powered on after the battery backup time has been exceeded, the clock will start with the setting MO and the number of the current operating system, in this case 01:40 for catalog numbers 1760-L12xxx and 02:30 for catalog number 1760-L18AWA. I12345678 ............ MO 01:40 Q1234 STOP MO 02:30 1.........STOP The Pico clock has a one-week cycle so that weekdays and times have to be set.
Pico System Settings 6-9 Changing to Winter Time Pico displays “SUMMER TIME” as the next possible option if winter time is already set. Otherwise select “WINTER TIME” and press Ok. Pico sets the clock one hour back, e.g. from 17:43 Sunday to 16:43 Sunday. The display then shows “SUMMER TIME”. Changing to Summer Time Select “SUMMER TIME” and press Ok. Pico sets the clock one hour forward, e.g. from 12:30 Wednesday to 13:30 Wednesday. SET CLOCK SUMMER TIME The display then shows “WINTER TIME”.
6-10 Pico System Settings Activating Debounce (Input Delay) Select “DEBOUNCE ON” and press Ok. If Debounce mode is activated the display shows “DEBOUNCE OFF”. Press Esc to return to the status display. How Pico input and output signals are processed internally is explained in Delay Times for Inputs and Outputs on page 8-7.
Pico System Settings Start-Up Behavior 6-11 The start-up behavior is an important feature during the commissioning phase. The circuit diagram which Pico contains may not be completed or the system or machine may be in a state which Pico is not permitted to control. The outputs should not be activated when Pico is powered on. Setting the Start-Up Behavior The 1760-L12AWA-ND model can only be started in Run mode. Requirement: Requirement Pico must contain a valid circuit diagram. Enter the System menu.
6-12 Pico System Settings Possible Faults Pico will not start in Run mode 1. Pico does not contain a circuit diagram. 2. You have selected MODE: STOP in the MODE RUN/STOP menu (the menu displayed is thus MODE: RUN).
Chapter 7 Retention What is Retention? Some system and machine controllers for operating states or actual values require retentive settings. What this means is that values are retained even after power to a machine or system has been turned off and are retained until the actual value is overwritten. Pico Models with Data Retention Retentive values can be set with 1760-L12BWB-xx (via the SYSTEM menu) as well as 1760-L18AWA for the following markers and function relays.
7-2 Retention Setting Retention Requirement: Requirement Pico must be in Stop mode Switch to the System menu. If Pico is protected by a password, the System menu is not available until Pico is unlocked (see Unlocking Pico on page 6-3). Enable the Retention function (see figure on previous page). The menu item RETENTION ON/OFF is a toggle menu. The menu always displays the operating mode into which you can change. The default setting of Pico is the display RETENTION ON.
Retention Transfer Retentive Behavior 7-3 The setting for retentive behavior is a circuit diagram setting; in other words, the setting of the retention menu may also under certain circumstances be transferred to the memory card or during uploading or down loading from the PC. Circuit Diagram Transfer (Behavior) 1760-L12BWB-xx and 1760-L18AWA ➞ Memory Module When transfer is in this direction, the actual values are retained in Pico. The retention setting is transferred to the card.
7-4 Retention Retentive Auxiliary Relays (Markers) How the Retention Works The retentive markers M13, M14, M15, M16, D1 to D8 should be used in conjunction with the following coil functions. Instruction Type Set Impulse Relay Representation in Pico S M…, D… M…, D… Reset R M…, D… . NOTE When the condition for resetting the marker is satisfied, the marker is reset.
Retention 7-5 Circuit diagram (part): M8-M14------{Q2 I3------SM14 M9---------RM14 Signal diagram: It is always the contact state 'Make contact' which is displayed U M8 Q2 I3 M9 M14 U = Supply voltage The break contact of the retentive marker M14 is used. No enabling time is required for output Q2. Impulse Relay Task: After a power failure, the lights in a stairwell should resume their previous state.
7-6 Retention Circuit Diagram: Parameter Display: -----------TT2 I1-------- M15 M15-T2-----{Q1 X S 00.10 TRG { T2 RES + Signal diagram: U I1 M15 Q1 T2 t A t t B C U = Supply voltage Range A: Q1 was on prior to losing power. When power is re-applied and the T2 timer expires, Q1 turns back on. Range B: Q1 was on prior to losing power. When power is re-applied, switch I1 is on, so Q1 stays off. A brief flicker is avoided by using timer T2.
Retention 7-7 S/R Function Task: After a power failure the lights in a stairwell should resume their previous switching state. (This is another method to solve the same task.) Contacts and relays used: Coil T2 I1 M1 M2 Q1 Function Enable after first cycle Push-button Push-button pulse (rising edge detection) Pulse limitation (one shot) Lamp output M15 Impulse relay (retentive) -----------TT2 I1-M2------{M1 --------{M2 X S { M1-M15----SM15 00.
7-8 Retention The circuit above functions in the same way as an impulse relay switch. The make contact remains switched on in the first Pico cycle if • a coil is actuated by the make contact of a retentive marker (series and parallel connection both apply here too) and • when the power is switched on, the reset condition for this retentive marker is on. The enable time T2 prevents Q1 from flickering.
Retention 7-9 Examples On-Delayed, Switching On-Delayed with Random Range, Retentive Task 1 (on-delayed): A motor must start up 30 seconds after an enable signal is given. This task is implemented using an input device which retains its '1' state on power-up. Contacts and relays used: Coil I1 Q2 T8 Function Motor Enable Motor Delay time Circuit Diagram: Parameter Display: I1---------TT8 T8------{Q2 X S 30.
7-10 Retention Contacts and relays used: Coil T6/T7 I2 Q1 I3 M16 T8 Function One shot timers Start conveyor belt Conveyor belt motor Stop conveyor belt Stop selected Remaining time Circuit Diagram: Parameters Entered: I2---------TT6 T6---------SQ1 M16 I3----------TT1 X S { 30.00 TRG T8 RES + T1---------SM16 M16---------TT8 T8----------RQ1 Time setting for T6, T7 00.00 s RM16 I2 and I3 are converted to one-shot pulses by T6 / T7. Only the actuation of the push-button is recognized.
Retention 7-11 Off-Delayed, Off-Delayed Switching with Random Time Range, Retentive Task: No-load running of a conveyor belt. (Same as previous example except implemented using an off-delay timer) Contacts and relays used: Coil T6/T7 I2 Q1 I3 M16 Function Single pulse Start conveyor belt Conveyor belt motor Stop conveyor belt Stop selected T8 Remaining time Circuit Diagram: Parameters Entered: I2---------TT6 T6-T8------SQ1 M16 I3---------TT7 T7--------SM16 M16---------TT8 T8---------RQ1 S { 30.
7-12 Retention Single-Pulse Timing Relays, Retentive Single-pulse timing relays are suitable for metering adhesives, liquids etc. Task: A lubricating device is to always dispense the same quantity of oil. Contacts and relays used: Coil I1 Q1 T8 Function Start lubrication Oil valve Oil time Circuit Diagram: Parameters entered: I1---------TT8 T8---------{Q1 S { 30.
Retention 7-13 Flashing Switch Operation, Retentive Task: A flasher function is used to lower an ink stamp at identical time intervals to print an area and then to raise the stamp to prepare for the next hit. Contacts and relays used: Coil Q1 T8 Function Valve Time Parameters entered: -----------TT8 T8---------{Q1 S { 10.00 TRG RES T8 + Signal diagram: U T8 Q1 t t1 A t2 t t1 + t2 = t U = Supply voltage Range A: Within this range the power is turned off.
7-14 Retention Retentive Up/Down Counters C7, C8 How the Retention Works The actual value of counter C7, C8 is retentive. When the condition for resetting the counter is satisfied, the actual value of the counter will be reset. Examples Counting Parts Task 1 Parts are packed automatically in a shipping carton. Even if there is a power outage, the correct number should still be packed into the carton. When the carton is full, the carton is removed manually and the counter reset.
Retention 7-15 Operating Hours Counter for Maintenance Intervals Task 2 Every 1000 hours, the system or machine must have preventive maintenance performed. Filters and transmission oil must be changed and the bearings lubricated. Contacts and relays used: Coil T8 M16 Q4 C8 I1 Function Clock pulse Block double pulse Warning light, 1000 h reached Up counter Reset -----------TT8 T8-M16-----CC8 -------SM16 T8--------RM16 18:38 M:S { { 30.
7-16 Retention Signal diagram: U T8 M16 Q4 I1 A U = Supply voltage Range A: Value before power outage: 107 Value after switching back on: 107 Automatic Lubrication at Constant Intervals and With a Constant Quantity of Lubricant Task 3: After every 60 minutes of machine run time, the bearings of the machine must be lubricated for 30 seconds.
Retention Circuit Diagram:. 7-17 Parameters entered: -----------TT1 T1-M15-----CC8 C8--------SM15 S { M15--------TT8 00.50 TRG RES T1 + RC8 M15-T8-----{Q1 Parameter Display: T8--------RM15 { { 3600 DIR CNT RES C8 + Parameters entered: X S { 30.00 TRG RES T8 + Function of the Pico circuit diagram: T1 provides the clock pulse. When a time of t = 0.5 seconds is selected the counting period amounts to 2 x t = 1 s. One pulse is counted every second.
7-18 Retention Signal diagram: U T1 C8 M15 Q1 T8 t1 U = Supply voltage Publication 1760-UM001A-EN-P t2 t 1 + t 2 = 30 s
Chapter 8 Inside Pico Circuit Diagram Cycle In conventional control systems, relay control processes all the circuit connections in parallel. The speed with which a relay switches is thus dependent on the components used, and ranges from 15 to 40 ms for relay pick-up and drop-out. With Pico, the circuit diagram is processed with a microprocessor that simulates the contacts and coils of the relay logic and thus processes all switching operations considerably faster.
8-2 Inside Pico How Does This Affect Creation of the Circuit Diagram? Pico evaluates the circuit diagram in these five segments in order. You should therefore remember two points when you create your circuit diagrams: • The changeover of a relay coil does not change the switching state of an associated contact until the next cycle starts. • Always wire forward or from top to bottom. Never work backward. Example: Switching One Cycle Later This is the circuit diagram of a self-latching circuit.
Inside Pico Determining Cycle Time of Circuit Diagrams 8-3 The maximum cycle time of a circuit diagram must be known in order to determine the maximum counter frequency or reaction time of Pico. Blank Cycle Time Calculation Tables can be found on page A-7 of this manual.
8-4 Inside Pico Example: Parallel Circuit I2----------{Q4 Calculate the maximum cycle time for the following circuit diagram: I3 Function Basic pulse Refresh Contacts and bridged contact fields Coils Total rungs from the first one to the last one, with empty ones in between Number 1 1 4 1 2 Time Duration in µs 210 3500 20 20 50 Total 210 3500 80 20 100 Connecting lines (only – 20 – – – – – – – – – – 3910 Function Basic pulse Refresh Contacts and bridged contact fields Coils Total rungs from
Inside Pico 8-5 Example: Operating Hours Counter -----------TT8 T8-M16-----CC8 -------SM16 T8--------RM16 C8---------{Q4 I1---------RC8 RT8 Function Basic pulse Refresh Contacts and bridged contact fields Coils Total rungs from the first one to the last one, with empty ones in between Number 1 1 17 7 7 Time Duration in µs 210 3500 20 20 50 Total 210 3500 340 140 350 Connecting lines (only 2 20 40 1 1 – 20 20 – 20 20 – 4620 , , ) Timing relays Counters Analog value function relays Total 176
8-6 Inside Pico List of Times for Processing Function Relays Number Timing relays in µs Counters in µs Analog value processors in µs 1 40 40 120 2 120 100 180 3 160 160 220 4 220 230 260 5 300 300 300 6 370 380 360 7 440 460 420 8 540 560 500 Example: Operating Hours Counter -----------TT8 T8-M16-----CC8 -------SM16 T8--------RM16 C8---------{Q4 I1---------RC8 RT8 Function Basic pulse Refresh Contacts and bridged contact fields Coils Total rungs from the first one to the last one, with empty one
Inside Pico Delay Times for Inputs and Outputs The time from an input physically energizing to the time Pico actually reads the input is called the input delay time, and can be set in Pico. This function is useful, for example, in order to ensure a clean input signal despite contact bounce. 8-7 S1 0V I1 Pico DC and Pico AC units function with different input voltages and therefore also have different evaluation methods and delay times.
8-8 Inside Pico Delay times for Pico AC Units (1760-AWA, -L12AWA-NC, -L12AWA-ND, -L18AWA) The input delay with AC voltage signals depends on the frequency: • On-delay: – 66 ms at 60 Hz, 80 ms at 50 Hz • Off-delay: – I1 to I6 and I9 to I12: 66 ms at 60 Hz, 80 ms at 50 Hz – I7 and I8: 150 ms at 60 Hz, 160 ms at 50 Hz (1760-L12AWA-xx) – I7 and I8: 66 ms at 60 Hz, 80 ms at 50 Hz (1760-L18AWA) S1 1. 2. 1. A 2.
Inside Pico 8-9 S1 1. 1. A B Pico switches the contact as soon as it detects a pulse (A). If no pulse is detected, Pico switches off the contact (B). The procedure for changing the delay times is described in Activating Debounce (Input Delay) on page 6-9.
8-10 Inside Pico Publication 1760-UM001A-EN-P
Chapter 9 Troubleshooting You may sometimes find that Pico does not do exactly what you expect. If this happens, read through the following notes which are intended to help you solve some of the problems you may encounter. Use the power flow display in Pico to check the logic operations in the Pico circuit diagrams with reference to the switching states of contacts and relays. Only qualified persons should test Pico voltages while the device is in operation.
9-2 Troubleshooting Possible Situations When Creating Circuit Diagrams Possible Situations when Creating Circuit Diagrams Cannot enter contact or relay in circuit diagram Time switch switches at wrong times Cannot select analog comparator “Ax” Explanation Remedy Pico is in Run mode Select Stop mode Incorrect time or time switch parameters Pico ac versions have no analog inputs Cannot select time switch contacts When using a memory module Pico will display the message “PROG INVALID” Pico has no clo
Troubleshooting Event Event Explanation The actual values are not being Retention has not been stored retentively. enabled. Pico 1760-L12Axx does not recognize the function. The RETENTION ON/OFF menu This Pico model does not have is not displayed in the SYSTEM this function. menu. Pico is in Run mode The SYSTEM menu is not Pico is password protected displayed. Pico starts only in Stop mode No circuit diagram in Pico Start-up behavior is set to the function “Start-up in operating mode STOP”.
9-4 Troubleshooting Publication 1760-UM001A-EN-P
Chapter 10 DC Simulator Description The DC Simulator, catalog number 1760-SIM, can be used to simulate Pico inputs and outputs to test and troubleshoot programs. The simulator contains three components: Input simulator board, output simulator board, and wall-mount power supply. The illustration on page 10-2 shows how to connect the simulator to Pico. The input simulator board contains 8 maintained push buttons connected to the 8 inputs of Pico as well as 2 potentiometers connected to Inputs 7 and 8.
10-2 DC Simulator Installation Guidelines ATTENTION ! Be sure that power is not applied when installing the input and output simulator boards. Follow the installation procedure below. Identifying Components Installation Procedure A. Digital Inputs 1. Connect inputs. B. I7 and I8 Analog Inputs 2. Connect outputs. C. Power Supply Unit 3. Plug in connection cable D. Connection Cable 4. Connect power supply. E. Output LEDs 5. Plug in power supply unit.
Appendix A Specifications Physical Specifications Environmental Specifications Specification Dimensions W x H x D 1760-L12xxx 1760-L18AWA 71.5 mm (2.82 in.) x 90 mm (3.55 107.5 mm (4.24 in.) x 90 mm in.) x 58 mm (2.28 in.) (3.55 in.) x 58 mm (2.28 in.) Weight [g] 200g (7 oz.) 300g (10.6 oz) Mounting DIN Rail 50022, 35 mm or screw mounting with 3 or 4 mounting feet Solid/Stranded AWG 22 to AWG 12 Slot-head screwdriver, width 3.5 x 0.8 mm Tightening torque 0.57 to 0.
A-2 Specifications Electrical Specifications Publication 1760-UM001A-EN-P Ambient mechanical conditions Specification Value Standard Pollution degree 2 – Protection class IP 20 EN 50178, IEC 60529, VBG4 Vibration 10 to 57 Hz IEC 60068-2-6 (constant amplitude 0.15 mm) 57 to 150 Hz (constant acceleration 2G) Shock 18 shocks IEC 60068-2-27 (semi-sinusoidal 15G/11 ms) Drop 50 mm (1.97 in) IEC 60068-2-31 Drop, packaged 1m (39.
Specifications Power Supply A-3 1760-L12AWA, -L12AWA-NC, -L12AWA-ND, and 1760-L18AWA Incoming Power Rated value (sinusoidal) Range Frequency, rated value, tolerance Line Current at 115/120V ac 60 Hz at 230/240V ac 50 Hz 1760-L12AWA-xx 110 to 240V ac +10/-15% 90 to 264V ac 50/60 Hz, ±5% 1760-L18AWA 100 to 240V ac +10/-15% 85 to 264V ac 50/60 Hz, ±5% Nominal 40 mA Nominal 20 mA Nominal 70 mA Nominal 35 mA Voltage dips Power Consumption at 115/120V ac at 230/240V ac 20 ms, EN 61131-2 20 ms, EN 61131-
A-4 Specifications Specification 1760-L12AWA-xx 1760-L18AWA Delay time I1 to I6 and I9 to I12, From 0 to 1 and from 1 to 0 Debounce ON 80 ms (50 Hz), 66.66 ms (60 Hz) Debounce OFF 20 ms (50 Hz), 16.66 ms (60 Hz) Delay time I7, I8 from 1 to 0 Debounce ON 160 ms (50 Hz), 80 ms (50 Hz), 150 ms (60 Hz) 66.66 ms (60 Hz) Debounce OFF 100 ms (50 Hz/60 Hz) 20 ms (50 Hz), 16.66 ms (60 Hz) Delay time I7, I8 from 0 to 1 Debounce ON 80 ms (50 Hz), 66.66 ms (60 Hz) Debounce OFF 20 ms (50 Hz), 16.66 ms (60 Hz) Max.
Specifications Specification Analog inputs Number Electrical isolation To power supply To the digital inputs to the outputs Input type Signal range Resolution analog Input impedance Accuracy of Two Pico devices within a single device (I7, I8) Conversion time, analog/digital 1760-L12BWB, -L12BWB-NC 2 No No Yes dc voltage 0 to 10V dc 0.1V 11.2K Ω ±3% of actual value ±2% of actual value ±0.
A-6 Specifications Specification Making capacity AC-15 cos φ= 0.4, 250V ac, 3A (600 Ops/h) DC-13 L/R≤ 150 ms, 24V dc, 1A (500 Ops/h) Breaking capacity AC-15 cos φ= 0.
Specifications Cycle Time A-7 1760-L12AWA, -L12AWA-NC, -L12AWA-ND, -L12BWB, and -L12BWB-NC Function Basic pulse Refresh Contacts and bridged contact fields Coils Circuit connections from the first one to the last one, with empty ones in between Connecting lines, only Number 1 1 Time Duration in µs Total 210 3500 20 20 0 20 Timing relays (see Table below) Counters (see Table below) Analog value function relays (see Table below) Total Number Timing relays in µs Counters in µs Analog value processors in
A-8 Specifications Dimensions 1760-L12AWA, -L12AWA-NC, -L12AWA-ND, -L12BWB, and -L12BWB-NC 10.75 mm (0.423 in) 50 mm (1.97 in) 90 mm (3.54 in) 45 mm (1.77 in) 110 mm (4.33 in) 102 mm (4.02 in) 4.5 mm (0.177 in) 47.5 mm (1.87 in) 56.5 mm (2.22 in) 58 mm (2.28 in) M4 35.75 mm (1.41 in) 71.5 mm (2.81 in) 1760-L18AWA 16.25 mm (0.640 in) 16.25 mm (0.640 in) 75 mm (2.96 in) M4 45 mm (1.77 in) 110 mm 90 mm (4.33 in) (3.54 in) 102 mm (4.02 in) 4.5 mm (0.177 in) 47.5 mm (1.87 in) 56.5 mm (2.
Appendix B Circuit Diagram Form See page 4-15 for an example that shows how to use these forms for planning and preparing your Pico circuit diagrams.
B-2 Circuit Diagram Form Customer: Program: Date: Page: Timing relays : : : TRG T : TRG RES : T : TRG RES T RES Analog comparators ANALOG ANALOG ANALOG A A A Timing switches - - - ON : ON : ON : OFF : OFF : OFF : Up/down counters DIR CNT RES Publication 1760-UM001A-EN-P DIR C CNT RES DIR C CNT RES C
Glossary The following terms are used throughout this manual. Refer to the Allen-Bradley Industrial Automation Glossary, Publication Number AG-7.1, for a complete guide to Allen-Bradley technical terms. Analog input - The DC versions of Pico have analog inputs I7 and I8. The input voltage range is 0 V to 10 V. Input data is evaluated by built-in analog comparator function relays. Circuit connections - Every line in the circuit diagram display represents a circuit connection.
Glossary 2 Operating buttons - Pico has eight operating buttons. These are used to select menu functions and create circuit diagrams. The large round button in the middle is used to move the cursor. DEL, ALT, ESC and OK all perform additional functions. Operating mode - Pico has two operating modes: RUN and STOP. RUN mode is used to process your circuit diagram (with the controller running continuously). In STOP mode you can create your circuit diagrams.
Index Numerics 20 mA sensors 2-13 A Actual values 4-14 Allen-Bradley contacting for assistance P-2 support P-2 Analog comparators Parameters 4-34 AND circuit 4-39 B Basic circuit Changeover circuit 4-40 Latching circuit 4-41 Parallel connection 4-40 Permanent contact 4-39 Series connection 4-39 Break contact 4-3, 4-7 Button ALT 3-6 OK 3-4 Buttons 1-3 OK 4-2 C Cable lengths 2-8 Cable protection 2-5 Changeover circuit 4-40 Changing menu level 3-4 Changing to summer time 6-9 Changing to winter time 6-9 Circ
2 Index Delay times for “easy”-AC 8-7, 8-8 Deleting retentive actual values 7-2 Deletion, retentive actual values 7-2 Determining counter frequency 4-26 Determining the cycle time 8-3 Dimensions, “easy” A-1 E Overview of “easy” 1-2 Entry Contact 3-5 Error handling 9-1 Example programs 4-39 Examples Impulse relay 7-5 S/R coil (break contact) 7-4 S/R function 7-7 Timing relay on-delayed 7-9 Timing relay, off-delayed 7-11 Timing relay, single-pulse 7-12 F Flicker effect 7-4 Function relays Counter relays 4
Index Time switches 4-31 Timing relays 4-20 Parameters Changing 6-5 Changing the switching time 6-7 Display 6-6 Power flow display 4-18 Password Activating 6-2 Changing 6-4 Deleting 6-4 Remove protection 6-4 Setting 6-2 Unlocking “easy” 6-3 Password incorrect or not known 6-4 P-Buttons 4-9 PC connection 5-4 PicoSoft software 5-4 Power failure 3-2 Power flow display 3-7, 4-10, 4-18 Program examples 4-39 Protecting timer and counter settings 4-19 publications, related P-1 Purpose of this Manual P-1 R Reed r
4 Index W Wiring Backwards 8-2 Relays 4-12 Rules 4-12 Publication 1760-UM001A-EN-P X XOR circuit 4-40
Back Cover Publication 1760-UM001A-EN-P - June 2000 2 Supersedes Publication 1764-6.1 - February 1999 and 1764-6.1-DU1 - September 1999 PN 40072-084-01(A) © 2000 Rockwell International Corporation. Printed in the U.S.A.
