ZETRON Models 1708 and 1716 Remote Terminal Units Installation and Operation Manual Part No. 025-9209J Copyright © 2004 by Zetron, Inc.
Statements WARRANTY Zetron’s warranty is published in the current Zetron United States Price Book. LIMITATION OF LIABILITY Zetron makes no representation with respect to the contents of this document and/or the contents, performance, and function of any accompanying software and specifically disclaims any warranties, expressed or implied, as to merchantability, fitness for purpose sold, description, or quality.
Statements FEDERAL COMMUNICATIONS COMMISSION (FCC) REGULATIONS This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment.
Statements 025-9209 v
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Contents WARRANTY ......................................................................................................iii LIMITATION OF LIABILITY ...........................................................................iii COPYRIGHT.......................................................................................................iii TRADEMARKS ..................................................................................................iii FEDERAL COMMUNICATIONS COMMISSION (FCC) REGULATIONS...
Contents Replacement Destination Address ...........................................................14 Next slot ...................................................................................................14 Example ...................................................................................................14 DIGITAL INPUT DEFINITION.........................................................................15 Enable Input ..........................................................................
Contents RS-232 Watchdog Configuration ............................................................28 CONFIGURING THE RTUs...............................................................................28 Assign Addresses .....................................................................................28 MODBUS Version of the RTU Menu .....................................................29 CONFIGURING THE MASTER PC (OR PLC).................................................29 BASIC MODBUS I/O ADDRESSING ..
Contents APPENDIX B MODEL 1730/1732 COMMUNICATIONS AND I/O TEST PROGRAM........59 STARTING THE PROGRAM ............................................................................59 SETTING OPTIONS ...........................................................................................60 THE POLL MENU ..............................................................................................61 THE SET MENU.................................................................................................
INTRODUCTION GENERAL A Model 1708 or 1716 Remote Terminal Unit (RTU) is one part of a wireless SCADAi telemetry system. A SCADA system typically consists of a PC with software connected to a Controller and one or more RTUs at multiple distant locations. The Controller and RTU are both microprocessor controlled and, along with the user’s radio link, make up the communications network necessary for monitoring and controlling equipment at remote sites.
Introduction Table 1. Digital and Analog I/O Capability I/O 1708 1716 1700 Digital In Digital Out Analog In Analog Out 8 8 4 0 16 16 8 4 0 4 0 0 The RTU is initialized through the RS-232 port, which allows the user to customize the parameters for each RTU to best fit the application.
Introduction A MODBUS SCADA system with a Model 1700 controller is shown in Figure 2. In a MODBUS system, the PC can communicate with up to 150 Model 1708 or Model 1716 RTUs over radio or wireline through a single Model 1700 controller. A system can be expanded beyond 150 RTUs by adding additional controllers and using additional serial ports on the PC. The total number of RTUs in a system is limited only by the number of serial ports available on the PC, and by the MODBUS slave address limit of 247.
Introduction There are a variety of other status points that may be monitored: open door or window, high water alarm, high temperature, main power, panic button for man at site, etc. The RTU analog input range is 0 to 5 Vdc, and the levels being monitored should be electrically scaled to fall within this voltage range. Many sensing devices output 0 to 5 Vdc. However, some sensor outputs are 4 to 20 mA current loops, or an input may be using a 12volt power supply.
SPECIFICATIONS PHYSICAL SPECIFICATIONS Power 10.5-16 Vdc Current 75 mA typical, 150 mA maximum Temperature 0 to +60 degrees C Size 7.25"W x 10.5"L x 2.25"H Weight 2 pounds RS-232 INTERFACE Baud Rate 4800 Parity None Bits 8 Stop Bits 1 RADIO INTERFACE Audio Output 20 mV to 2 V p-p (mic level audio), 1 kΩ Audio Input 100 mV to 4 V p-p, 50 kΩ Channel Busy Input Low: 0 to 0.7 Vdc, <100 Ω to ground High: 3.
Specifications Signal Integrity Required Signal Strength 95% success at 12 dB SINAD Probability of False Data 1 in 109 (0.0000001%) I/O SPECIFICATIONS External Inputs Contact Closure Inputs Model 1708: 8 inputs Model 1716: 16 inputs Contact closure to ground or 0-5 V or 5-0 V voltage change Logic low: <500 Ω or <0.8 Vdc Logic high: >2.5 kΩ or >2.
OPERATION GENERAL OPERATION The Model 1708 and Model 1716 Remote Terminal Units (RTUs) perform two basic tasks: 1. RTUs report changes in input/output to the Controller 2. RTUs respond to commands from the Controller. Analog and digital inputs may be configured to report changes as they occur without being polled by the Controller (report by exception). When the RTU recognizes an alarm condition, it will check to see if the radio channel is busy.
Operation ADDRESSING THE RTU The RTU is DIP switch addressable from 1 to 255. This is done by using the 8-position DIP switch labeled SW1. Position #1 is the LSB and position #8 is the MSB. All switches off corresponds to 0, and all switches on is 255. The count is binary: #1 → 1 #2 → 2 #3 → 4 #4 → 8 #5 → 16 #6 → 32 #7 → 64 #8 → 128 Each unit on a system must have a different ID in order to respond.
Operation CONFIGURATION Each RTU will need to be configured prior to its use unless the factory default initialization values are satisfactory for the application. To configure an RTU, you will need: 1. A “dumb terminal” or a PC running in the dumb terminal mode. Software programs such as CrossTalk, Kermit, ZCU, Procomm, and others will provide terminal emulation on a PC. 2.
Operation MAIN MENU Table 2. RTU Main Menu Menu Selections Range Factory Settings {P}rekey time 0-40 (x0.1 second) 5 (0.5 second) {C}hannel busy detect Low or High Low (inhibit on logic low) Channel {B}usy Timeout 0-40 (x0.1 second) 0.
Operation Channel Busy Detect To identify when the channel is in use, the carrier must be set to inhibit transmission on either High (+5 or open) or Low (0 V). The level entered here will PREVENT transmission. For trunked operation, this is used the same way to inhibit transmission. The proper name for this parameter should be “channel-acquired indication” when a trunked system is being used.
Operation All RTUs in a system can have the same group call address, or you can achieve a zoning effect by assigning one address to one group of RTUs and another address to a different group. The group call address should not be the same as the RTUs DIP switch address. Factory Defaults This menu selection will allow the user to reset all configurable parameters to the defaults set at the factory including input/output definitions.
Operation WARNING Do NOT enable the Communication Failure feature if you are using a Model 17 or Model 1700 Controller with a software version lower than 3.10. Doing so can cause permanent loss of communications between the RTU and the Controller and require a trip into the field to cycle power on the RTU. Channel Use Limits Failure of a transducer or other device attached to the inputs of an RTU may cause random alarm transmissions that tie up the radio channel.
Operation Slot No. There are up to 16 slots to configure. Source Address Input the address of the transmitting unit. Destination Address Input the address of the unit that the transmitting unit is trying to reach. Replacement Source Address Input the new address of the transmitting unit. Replacement Destination Address Input the new destination address of the transmitting unit. Next slot Go to the next slot. Exit This selection will take the user back to the main menu.
Operation We have configured RTU #5 to act as the store and forward unit between Controller Unit #0 and RTU #150. If Controller Unit #0 tries to poll RTU #10 (a fake address for RTU #150), the transmissions listed in Table 6 will occur. Table 6. Store and Forward Traffic Flow Transmission From To Description No. 1 #0 #10 Controller Unit #0 polls RTU #10. No. 2 #5 #150 RTU #5 has been configured in Slot #1 to recognize and re-send all transmissions of 0-to-10 as 5-to-150. No.
Operation Disable Input If the input is disabled, its status will still be sent during a poll response, but any change in the state of the input will not cause the RTU to transmit an alarm. N/O Input In the normally open mode, the input will cause an alarm transmission whenever it detects a change from high to low or open to closed (closure to ground). N/C Input In the normally closed mode, the input will cause an alarm transmission whenever it detects a change from low to high or closed to open.
Operation DIGITAL OUTPUT DEFINITION Table 8. RTU Digital Output Definition Menu Menu Selections Range {L}atched mode {M}omentary mode Factory Settings Latched 0-255 seconds 0 seconds {O}utput ON {F}orce output OFF {N}ext output E{x}it Latched Mode When latched mode is selected, if the output is commanded on, it will remain in that position until it is commanded off (or power is removed).
Operation ANALOG INPUT DEFINITION Table 9. RTU Analog Input Definition Menu Menu Selections Range {E}nable Input Factory Settings Enabled {D}isable Input {H}igh Threshold Value 0-5.00 volts 5.00 volts {L}ow Threshold Value 0-5.00 volts 0.00 volts High {R}eset Value 0-5.00 volts 5.00 volts Lo{w} Reset Value 0-5.00 volts 0.00 volts Accumulator {S}ampling Rate 1 to 65535 (x0.1 second) 10 (1 sample per second) % {C}hange alert 0 to 100% 1.9% % Change de{B}ounce 0 to 250 (x0.1 second) 0.
Operation High Reset To provide for hysteresis, set this value slightly below the high threshold value. The voltage being measured must drop below the High Reset value before another alarm can be initiated. This prevents chattering when a voltage hovers right at the threshold value. Low Reset To provide for hysteresis, set this value slightly above the low threshold value. The voltage being measured must rise above the Low Reset value before another alarm can be initiated.
Operation SYSTEM OPERATIONAL LIMITS Inputs Chatter Chattering occurs when a status being monitored changes rapidly, that is, more than once every few seconds. Chattering can cause the RTU to send multiple reports using excessive airtime. The debounce time and hog time in the RTU should be used to prevent excessive transmissions. Broken Connection Analog Input - The voltage read by the analog input would float, following the voltage of the previous analog input.
Operation Power Brown Power There is a low power reset circuit in the RTU which will disconnect power when supply voltage drops below 9.35 volts ±5%. Power Up Conditions The RTU performs a self-test on power up. If there are errors detected during the self-test, operation is suspended. The digital and analog output states are designed to be in a high impedance and 0 Vdc state respectively. If the self-test fails, these default values may not be valid.
Operation Radio System A radio stuck in transmit for any reason (PTT held in, electronic failure, chattering PTT, etc.) will prevent or interfere with other transmissions. Radios should provide a PTT timer that prevents continuous transmission for extended periods, usually three minutes. This only helps if the radios are functioning properly. It will not prevent all cases of transmit lock-out. RS-232 Transmit or receive data failure will cause loss of communications between the PC and the Controller.
MODBUS SYSTEM SET UP This section describes the functioning of the Model 1700 controller and Model 1708/1716 RTUs in a MODBUS system. MODBUS OPTION The Model 1700 controller has an optional implementation of the industry standard MODBUS protocol. This option is provided by means of a replacement EPROM containing code to support the MODBUS protocol when communicating with the PC running the MODBUS application.
MODBUS System Set Up COMMUNICATIONS In a MODBUS system using radio or wireline communications, only the controller speaks MODBUS. For queries addressed to RTUs, the controller translates back and forth between the MODBUS protocol and the RTU radio protocol. There are two ways to set up a MODBUS system using the Model 1700 controller with the MODBUS option: Polled-only and report-by-exception. Polled-Only System In a polled-only system, the “master” PC or PLC controls all communication in the system.
MODBUS System Set Up RTUs. In a large system with lots of I/O activity, this can result in frequent communications failures. Which Is Better - Polled-Only or Report-By-Exception? A polled-only system is easier to configure. Problems in a polled-only system can be much easier to diagnose. For example, if a communications failure occurs, it can not be due to data collisions, but is probably a true indication of a problem with the RTU, radio or communications path.
MODBUS System Set Up CONFIGURING THE 1700 CONTROLLER When using the MODBUS option, the Model 1700 controller address is usually set to “1” (DIP switch 1 ON, DIP switches 2 through 6 OFF). Any address in the range of “1” to “63” could be used. It should never be set to “0”.ii The Model 1700 controller has built-in configuration menus that can be accessed through a PC with a terminal program.
MODBUS System Set Up 4. From the MODBUS menu, type “A” to open the Autopoll menu. 5. From the Autopoll menu, type “I” to open the Interval item. 6. At the Autopoll Interval prompt, type in zero (0) and then press ENTER to disable the autopoll feature. 7. At the Autopoll menu, type “X” to return to the MODBUS menu. At the MODBUS menu, type “X” to return to the controller main menu.
MODBUS System Set Up You may now exit the programming mode or continue with any other configuration programming that you need to perform on this controller. Note The RTU Response Timeout sets the period for which the controller will wait for a response whenever it polls an individual RTU. A period of 5 to 10 seconds will normally be adequate; however, if the store-and-forward method is being used, the timeout period might have to be set to a larger value.
MODBUS System Set Up MODBUS Version of the RTU Menu When you access the program mode for a Model 1708/1716 that has been equipped with the MODBUS version of the RTU firmware, a shortened version of the main menu appears. Table 13 lists this modified menu. Basically, all the menu items dealing with radio communication or the controller addressing have been removed. Table 13.
MODBUS System Set Up rapidly changing signals could be polled more often than less important or slowly changing signals. Timeout Periods The timeout period should be the same for both poll-only and report-by-exception systems. The period should be set to minimum time that it takes for a poll to go out over the radio to an RTU and for the response to return to the master. A typical value is five seconds.
MODBUS System Set Up Within the MODBUS protocol, the Input Status and Input Register signal types (digital and analog inputs) are read-only. The Coil and Holding Register signal types (digital and analog outputs) may be both read from and written to. When configuring the MODBUS master, the MODBUS addresses and value ranges must be used. Table 15 lists the allowable range values in relation to the signal types. Table 15.
MODBUS System Set Up There is one digital input counter for each input of the Model 1708 or Model 1716 RTU. Each counter consists of two values: the count and the time period since the counter was last cleared. The count value increments each time the input activates. When the input is set up as status mode, the count increments every time the input changes state. If the input is set up as normally open or normally closed, the count increments when the input is grounded or disconnected respectively.
MODBUS System Set Up An illegal data address exception will be returned to queries beginning at unused addresses, 40005 - 41010, 41088 - 42010, and 42167 - 99999. Only one accumulator or counter can be polled at a time. Table 17.
MODBUS System Set Up V×I MH − ML A= − SL × + ML N × 256 SH − SL The sample rate is returned in 10ths of a second. The default sample rate is 10, or 1 sample per second. The time period (in seconds) over which the accumulation took place can be calculated as: P = N × R ÷ 10 Once the scaled average value and time period are known, the total can be calculated by multiplying the average value by the time period.
MODBUS System Set Up T= 67.13gal / min × 130864Sec 60Sec / min T = 146415gal Table 18 shows the MODBUS holding register addresses used for digital input counters. Table 18.
MODBUS System Set Up SOFTWARE PRODUCTS FOR THE MODBUS PROTOCOL The following list contains some of the software packages known to work with the Model 1700 Controller MODBUS option. Please note that Zetron does not sell or support these packages. For sales and support, please contact the manufacturer directly. FIX Lookout Intellution One Edgewater Drive Norwood, MA 02062 National Instruments Corporation 11500 North Mopac Expressway Austin, TX 78759 Tel: 781-769-8878 Fax: 781-769-1990 www.intellution.
SET UP AND INSTALLATION INSTALLATION The Model 1708/1716 may be wall-mounted or mounted within a standard industrial enclosure. See the Model 1700 series enclosure outline (024-0057, page 52) and instructions (024-0056, page 53) for details on mounting the unit. Power Connection The power connection is made on the same connector as the radio connections. The RTU operates from 10.5-16 Vdc. Since it requires less than 150 mA, the radio power supply (if it provides 10.5-16 Vdc) is often used to power the RTU.
Setup and Installation Radio Connection The Radio Connector P3 on the RTU requires a minimum of six connections to interface with the radio. The shaded rows in Table 19 indicate that those connections are optional. Table 19.
Setup and Installation If your radio provides a logic change of 5-0 Vdc when channel is busy, install JP1 in the A position and leave the RTU setting for Carrier detect as the factory default setting of low. If your radio provides a relay contact closure to ground or open collector output, install JP1 in the B position and leave the RTU setting for Carrier detect as the factory default setting of low. You may wish to refer to “Channel Busy Detect” (on page 11) which discusses the carrier detect setting.
Setup and Installation TP1 (Audio in) Set to 1V P-P using RXAUD pot. Repeat Step 3 but for transmit audio on RTU #2 and receive audio on RTU #1. CAUTION Remove the jumpers when finished testing. Do not to leave the radios transmitting continuously as this can harm some radios. MODEL 1708 JUMPERS AND I/O The jumper and I/O connector information in this subsection applies to the Model 1708 (Part No. 901-9260). For similar information applying to the 1716, see page 42.
Setup and Installation Model 1708 I/O Connections J2 DB9-S(9-pin RS-232 Port) Pin # Connection 1 N/C 2 N/C 3 Transmit from RTU (TXD) 4 Receive from external device (RXD) 5 Ground 6 +12Vdc (fused) - JP2 enable jumper 7 N/C 8 N/C 9 DTR J1 Pin # Connection Pin # Connection 1 Ground 10 Ground 2 Digital Input #1 11 Analog Input #1 3 Digital Input #2 12 Analog Input #2 4 Digital Input #3 13 Analog Input #3 5 Digital Input #4 14 Analog Input #4 6 Digital Input #5 15 E
Setup and Installation MODEL 1716 JUMPERS AND I/O The jumper and I/O connector information in this subsection applies to the Model 1716 (Part No. 901-9261). For similar information applying to the 1708, see page 40. Model 1716 Jumper Settings Jumper Description JP1 Carrier Detect A = 47kΩ pull-down to ground B = 47kΩ pull-up to +12 Vdc JP2 Serial Port Power Connects +12 VDC (fused) to J2 Pin 6 of RS-232 Connector (DB9) JP3 Push-To-Talk A = PTT completes the connection between P3 Pin 3 and Pin 4.
Setup and Installation Model 1716 I/O CONNECTIONS The I/O connector information in this subsection applies ONLY to the Model 1716 (Part No. 901-9261). For similar information applying to the 1708, see page 40.
Setup and Installation J5 Pin # Connection Pin # Connection 1 Ground 10 Ground 2 Digital Output #1 11 Digital Output #9 3 Digital Output #2 12 Digital Output #10 4 Digital Output #3 13 Digital Output #11 5 Digital Output #4 14 Digital Output #12 6 Digital Output #5 15 Digital Output #13 7 Digital Output #6 16 Digital Output #14 8 Digital Output #7 17 Digital Output #15 9 Digital Output #8 18 Digital Output #16 CONNECTION OF LOCAL RTU TO MODEL 1700 CONTROLLER When a lo
Setup and Installation 50-PIN INDUSTRIAL I/O BOARD CONNECTOR The 50-Pin Industrial I/O Board Connector P6 is designed for connection to many industrial I/O and signal conditioning boards available from a variety of manufacturers. This allows connection to these boards using a standard 50-conductor ribbon cable. The jumpers JP21 to JP36 allow the modular I/O connections to be configured as inputs or outputs. Digital Output #1 I/O Board Connection Digital Input #1 1 2 3 Figure 6.
Setup and Installation P6 Pin # 46 Connection Pin # Connection 1 Module I/O 24 26 Ground 2 Ground 27 Module I/O 11 3 Module I/O 23 28 Ground 4 Ground 29 Module I/O 10 5 Module I/O 22 30 Ground 6 Ground 31 Module I/O 9 7 Module I/O 21 32 Ground 8 Ground 33 Module I/O 8 9 Module I/O 20 34 Ground 10 Ground 35 Module I/O 7 11 Module I/O 19 36 Ground 12 Ground 37 Module I/O 6 13 Module I/O 18 38 Ground 14 Ground 39 Module I/O 5 15 Module I/O 17 40 G
THEORY OF OPERATION BASIC FUNCTIONAL DESCRIPTION The Models 1708 and 1716 Remote Terminal Units are microprocessor-based systems with a software intensive architecture that greatly enhances the versatility of the RTUs and allows them to be quickly adapted to varied tasks. The microprocessor controls all internal operations, radio audio path control, RS-232 serial port and external input/output interface operations.
Theory of Operation 48 025-9209
TROUBLESHOOTING GUIDE OVERVIEW In case of installation or operational difficulty, call Zetron at (425) 820-6363. Please have the serial number of the unit and/or the Zetron order number. If the call is made from the installation site by the installer or radio technician, the problem can usually be solved over the telephone. Some commonly encountered problems can be solved by following the recommendations below. Problem: Unit will not communicate with PC or dumb terminal.
Troubleshooting Guide Problem: Units will not communicate. Recommendations: Check address on RTU and Controller. Verify setting of DIP switch 7 and 8 on Controller.
REPAIR MODEL 1708/1716 COVER REMOVAL AND REPLACEMENT To remove the cover of the unit, rotate the cover up and off the cover centering-pin at the top. To replace the cover, position the cover over the centering pin and rotate the cover down to cover the unit. See the following diagrams for details.
Repair MODEL 1700 SERIES ENCLOSURE OUTLINE (024-0057B) 52 025-9209
Repair MODEL 1700 SERIES ENCLOSURE INSTRUCTIONS (024-0056D) (Sheet 1 of 2) 025-9209 53
Repair 024-0056D (Sheet 2 of 2) 54 025-9209
Repair MODEL 1708 REMOTE TERMINAL UNIT SILKSCREEN (702-9439F) 025-9209 55
Repair MODEL 1716 REMOTE TERMINAL UNIT SILKSCREEN (702-9440F) 56 025-9209
APPENDIX A COMMUNICATING OVER TWO-WIRE BALANCED LINE (600Ω) Zetron’s Model 1700, 1708, and 1716 RTUs all have similar data transmission circuitry. That circuitry is designed to operate with most makes and models of two-way radios. This applications note is designed to assist in connecting the Model 17xx units over wireline for data transmission over long distances.
Appendix A Simple copper-pair wire will require line drivers over long distances since attenuation is high. Leased lines from the phone company should not require external amplification devices. Collisions There is no data flow control provided in the transformer coupling. If a busy indication is available, it can be connected to the COR input P3-6 of the unit.
APPENDIX B MODEL 1730/1732 COMMUNICATIONS AND I/O TEST PROGRAM The Model 1730 - Model 1732 Communications And I/O Test program is a troubleshooting tool for the Model 1730 Controller and Model 1732, Model 1716 and Model 1708 RTUs.
Appendix B 1730 has the MODBUS option, it must be configured to use the ULTRAc protocol so that it will pass all messages received from RTUs through to the Communications And I/O Test program. When connected to the Model 1732 RTU, you will be able to test only the I/O points on that particular RTU. All functions of the program are accessed through the menus. The center of the main window is where messages received from the controller and/or RTUs are displayed.
Appendix B THE POLL MENU The Poll selection in the main menu is used to poll the Controller or RTU for current I/O status, logic register values (Model 1732 RTU only) or hardware information. Figure 11. The Poll Menu For menu items that end in an ellipsis (...), additional information such as the module or register number must be entered the before poll is sent. Examples of the dialogs for this are shown in Figure 12. Figure 12.
Appendix B THE SET MENU The Set option in the main menu is used to control outputs and change logic registers. Figure 13. The Set Menu When one of the Set menu items is selected, a dialog box always pops up requesting additional information such as the module number, output number and output value. Figure 14. Entering Output Control Information For setting logic registers, the register number, register type and new value are requested as shown in Figure 15. Figure 15.
Appendix B THE CLEAR MENU The Clear menu provides options for clearing the message window and for clearing counters, runtimes and accumulators. Figure 16. The Clear Menu On the Model 1730 Controller and Model 1732 RTU, you can select one or more counters, runtimes or accumulators to clear at the same time. Figure 17 shows how this is done for counters. Figure 17.
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GLOSSARY AC power module The module that connects a device to an AC power source. Accumulator See analog input accumulator. Acquisition timeout The timeout for the first two steps of radio transmission: radio contention via the TXREQ signal and channel busy detect via the COR signal. Address See module address. Analog input accumulator Analog input accumulators keep a running total of the analog input value over time. They are often used to keep a running total of some flow through a system.
Glossary Controller In this manual, the word “controller” refers to the device that interfaces between the computer controlling the SCADA system and a radio transceiver. Controller Address The device address of a Controller. Counter The counter value is a count of the number of times the digital input on the core module activates. Data address exception An error indication in the MODBUS protocol that occurs when a query is sent to an illegal data address.
Glossary Exception Report Channel The communications method used by a device for exception reports to a Controller. The choices are Radio, Phone, and Direct Serial. Exception reporting The ability of an RTU or Controller to report changes in I/O status to the master without being polled. Form C relay Relay with both normally open and normally closed contacts. Group Call Address An additional address assigned to an RTU (besides its own device address) to which the RTU responds.
Glossary Interpreter A method of computer programming where an intermediate language is used. Key Down Delay Delay between the end of a radio transmission and the time the radio is unkeyed. Key Up Delay Delay between the time the radio is keyed up and the start of data transmission. Leased line Permanent wireline connection between Controller and an RTU. Also called “private line.” Low Threshold A value used with analog inputs or outputs to determine when to report an exception or log data.
Glossary Outbound Address Range High Parameter used for store and forward radio communications. Outbound Address Range Low Parameter used for store and forward radio communications. Percent Change Delay A value used with analog inputs or outputs to determine when to report an exception or log data. Percent Change Threshold A value used with analog inputs or outputs to determine when to report an exception or log data. Phone line A dial-up telephone line.
Glossary Radio modem See radio interface module. Relay Output Module The module that connects a device to equipment to be controlled by the SCADA system. The equipment must have on/off controls. Report by exception See exception reporting. Retry For autopolling and exception reporting, an additional attempt to communicate with a device that fails to respond.
Glossary RTU Type A configuration setting. An RTU can be a Model 1708 or a Model 1716. SCADA Supervisory Control And Data Acquisition. General term for an industrial measurement, data gathering, and control system. The system usually consists of a central host or master, one or more field data gathering and control devices, called remote terminal units, and software used to monitor and control the remotely located field data gathering and control devices.
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INDEX % % change alert, % change debounce, 19 19 A accumulator sampling rate, address extension, addressing failure, addressing the RTU, analog input definition % change alert, % change debounce, accumulator sampling rate, disable input, enable input, high reset value, high threshold, low reset value, low threshold, next input, analog input scaling circuits, autopoll, 19 11 21 8 19 19 19 18 18 19 18 19 18 19 4 26 B basic functional description, basic MODBUS I/O addressing, buffer full, 47 30 22 C car
Index E enable input, 15, 18 enable/disable exception reports, 13 enclosure instructions, 1700 series, 53 enclosure outline, 1700 series, 52 EPROMs, 23 F factory defaults, fail safe set up menu, channel use limits, communication failure enable, enable/disable exception reports, force single coil, force output off, functional block diagram, 12 12 13 12 13 23 17 47 1 37 22 11 H high reset value, high threshold, holding register, 19 18 23 I I/O 1708, 1716, analog input definition menu, capability, digital
Index analog input definition, 18 digital input definition, 15 digital output definition, 17 fail safe set up, 12 main, 10 main, RTU with MODBUS option, 29 MODBUS, 26, 29 store and forward, 13 MODBUS, 2, 3, 23 autopoll, 26 basic I/O addressing, 30 comunications, 24 configuring 1700, 26 configuring 1708/1716, 28 master requirements, 25 menu for 1700, 26 menu for 1708/1716, 29 polled-only system, 24, 26 report-by-exception system, 24, 27 RTU status storage, 26 signal values, 31 software products supporting, 3
Index 1716, RTU radio protocol, RTU response timeout, RTU status storage, 56 24 28 26 S SCADA, scaling circuits, analog inputs, serial ports, signal values, MODBUS, silkscreen, RTU main PCB 1708, 1716, slaves, slot address, slot no.
