Owner’s Guide 0300198-03 Rev.
Important Notes 1. Please read all the information in this owner’s guide before installing the product. 2. The information in this owner's guide applies to hardware Series A and firmware version 1.0 or later. 3. This guide assumes that the reader has a full working knowledge of the relevant processor. Notice The products and services described in this owner's guide are useful in a wide variety of applications.
Table of Contents Preface ix Chapter 1 Module Overview 1 Who Should Use This Manual ..................................................................................................................... ix How to Use This Manual ........................................................................................ ix Related Documentation ........................................................................................... ix Conventions Used in This Manual ........................................
vi Compact IO™ Universal Input Module Chapter 4 Module Data, Status, and Channel Configuration 33 Chapter 5 Diagnostics and Troubleshooting 57 Appendix A 1769sc-IF8U Specifications Module Memory Map ............................................................................................ 33 Accessing Input Image File Data ........................................................................... 34 Input Data File .....................................................................................
Table of Contents Appendix D Using Thermocouple Junctions 95 Appendix E Module Configuration Using MicroLogix 1500 and RSLogix 500 101 Appendix F Configuring Your 1769sc-IF8U Module with the Generic Profile for CompactLogix Controllers in RSLogix 5000 107 vii Using a Grounded Junction Thermocouple ........................................................... 95 Using an Ungrounded (Isolated) Junction Thermocouple .................................... 97 Using an Exposed Junction Thermocouple .............
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Preface Read this preface to familiarize yourself with the rest of the manual.
x Compact™ I/O Universal Input Module · calling 1.800.963.9548 (USA/Canada) or 001.330.725.1574 (Outside USA/Canada) Conventions Used in This Manual The following conventions are used throughout this manual: · Bulleted lists (like this one) provide information not procedural steps. · Numbered lists provide sequential steps or hierarchical information. · Italic type is used for emphasis. · Text in this font indicates words or phrases you should type.
Chapter 1 Module Ov er vie w view Over This chapter describes the 1769-IF8u Universal Input Module and explains how the module reads current, voltage, RTD, Resistance and thermocouple/millivolt analog input data. Included is information about: · the module’s hardware and diagnostic features · an overview of the system and module operation · compatibility General Description The universal input module supports current, voltage, RTD, resistance, thermocouple and millivolt type inputs.
2 Compact IO™ Universal Input module Therm ocouple Type Tem perature Range Type B 300 to 1820C Type C 0 to 2315C Type E -270 to 1000C Type J -210 to 1200C Type K -270 to 1370C Type N 0 to 1300C Type R 0 to 1768C Type S 0 to 1768C Type T -270 to 400C Voltage Types ± 50 mV ± 100 mV ± 10 V 0 to 10 V 0 to 5 V 1 to 5 V Current Input Range 0 to 20mA 4mA to 20mA Da ta Data F or ma ts For mats Filter Fr equencies The data can be configured on board each module as: · engineering units x 1 · e
Chapter 1: Module Overview Hardware Fe at u r e s 3 The module contains a removable terminal block. Channels are wired as differential inputs with the exception of RTD and resistance type inputs. One cold junction compensation (CJC) sensor can be added to the terminal block to enable accurate readings when using thermocouple input types.
4 Compact IO™ Universal Input module 8b 9 10 10a 10b 11 lower DIN rail latch write-on label for user identification tags removable terminal block (RTB) with finger-safe cover RTB upper retaining screw RTB lower retaining screw CJC sensor General Diagnostic Features The module contains a diagnostic LED that helps you identify the source of problems that may occur during power-up or during normal channel operation. The LED indicates both status and power.
Chapter 1: Module Overview When the module receives the input from an analog device, the module’s circuitry multiplexes the input into an A/D converter. The converter reads the signal and converts it as required for the type of input. If thermocouples are being utilized, the module continuously samples the CJC sensor and compensates for temperature changes at the terminal block cold junction, between the thermocouple wire and the input channel. See the block diagram below.
6 Compact IO™ Universal Input module Thermocouple and RTD measurements are linearized using the specifications listed in the table below. Input Type 100? Pt 385 Specification 200Ω Pt 385 IEC-751, 1983 500Ω Pt 385 IEC-751, 1983 IEC-751, 1983 1000Ω Pt 385 IEC-751, 1983 100Ω Pt 3916 JIS C 1604, 1989 200Ω Pt 3916 IEC-751, 1983 500Ω Pt 3916 IEC-751, 1983 1000Ω Pt 3916 IEC-751, 1983 10Ω Cu 426 SAMA RC21-4-1966 120Ω Ni 618 120Ω Ni 672 DIN 43760 Sept.
Chapter 1: Module Overview Module Field Calibration 7 The module provides autocalibration, which compensates for offset and gain drift of the A/D converter caused by a temperature change within the module. An internal, high-precision, low drift voltage and system ground reference is used for this purpose. The input module performs autocalibration when a channel is initially enabled. In addition, you can program the module to perform a calibration cycle once every 5 minutes.
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Chapter 2 Quic k Star t Quick f or Experienced User s Users Before You Begin This chapter can help you to get started using the 1769sc-IF8u Universal input module. We base the procedures here on the assumption that you have an understanding of Allen-Bradley controllers. You should understand electronic process control and be able to interpret the ladder logic instructions required to generate the electronic signals that control your application.
10 Compact IO™ Universal Input module 3. Wiring the module 4. Configuring the module 5. Going through the startup procedure 6. Monitoring module operation Step 1: Ensure that your 1769 system power supply(1) has sufficient current output to support your system configuration. Reference Chapter 3 (Installation and Wiring) The modules maximum current draw is shown below 5V dc 24V dc 150 mA 45 mA NOTE The module cannot be located more than 8 modules away from the system power supply.
Chapter 2: Quick Start for Experienced Users ! 11 ATTENTION! Remove power before removing or inserting this module. If you remove or insert a module with power applied, an electrical arc may occur. 1. Check that the bus lever of the module to be installed is in the unlocked (fully right) position. 2. Use the upper and lower tongue-and-groove slots (1) to secure the modules together (or to a controller). 3.
12 Compact IO™ Universal Input module Step 3: Wire the module. Reference Chapter 3 (Installation and Wiring) Follow the guidelines below when wiring the module. General • Power and input wiring must be in accordance with Class 1, Division 2 wiring methods, Article 501-4(b) of the National Electric Code, NFPA 70, and in accordance with the authority having jurisdiction. • Channels are isolated from one another by ±10V dc maximum.
Chapter 2: Quick Start for Experienced Users 13 • To ensures optimum accuracy, limit overall cable impedance by keeping a cable as short as possible. Locate the module as close to input devices as the application permits. Grounding ! ATTENTION! The possibility exists that a grounded or exposed thermocouple can become shorted to a potential greater than that of the thermocouple itself. Due to possible shock hazard, take care when wiring grounded or exposed thermocouples.
14 Compact IO™ Universal Input module Step 4: Configure the module. Reference Chapter 4 (Module Data, Status, and Channel Configuration) Circuit jumpers are located on the module to change the input path from current to voltage. The configuration file is typically modified using the programming software compatible with your controller. It can also be modified through the control program, if supported by the controller. See Channel Configuration in chapter 4 for more information.
Chapter 2: Quick Start for Experienced Users 15
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Chapter 3 Installa tion and Wiring Installation This chapter tells you how to: · determine the power requirements for the module · avoid electrostatic damage · install the module · wire the module’s terminal block · wire input devices Compliance to European Union Directives This product is approved for installation within the European Union and EEA regions. It has been designed and tested to meet the following directives.
18 Compact IO™ Universal Input module Power Requirements The module receives power through the bus interface from the +5V dc/ +24V dc system power supply. The maximum current drawn by the module is shown in the table below. Module Current Draw General Considerations at 5V dc at 24V dc 150 mA 45 mA Compact I/O is suitable for use in an industrial environment when installed in accordance with these instructions.
Chapter 3: Installation and Wiring 19 Prevent Electrostatic Discharge ! ATTENTION! Electrostatic discharge can damage integrated circuits or semiconductors if you touch analog I/O module bus connector pins or the terminal block on the input module. Follow these guidelines when you handle the module: · Touch a grounded object to discharge static potential. · Wear an approved wrist-strap grounding device. · Do not touch the bus connector or connector pins.
20 Compact IO™ Universal Input module • away from sources of electrical noise such as hard-contact switches, relays, and AC motor drives • away from modules which generate significant radiated heat, such as the 1769-IA16. Refer to the module’s heat dissipation specification. In addition, route shielded, twisted-pair analog input wiring away from any high voltage I/O wiring. Power Supply Distance You can install as many modules as your power supply can support.
Chapter 3: Installation and Wiring 21 1. Disconnect power. 2. Check that the bus lever of the module to be installed is in the unlocked (fully right) position. NOTE: If the module is being installed to the left of an existing module, check that the right-side adjacent module’s bus lever is in the unlocked (fully right) position. 3. Use the upper and lower tongue-and-groove slots (1) to secure the modules together (or to a controller). 4.
22 Compact IO™ Universal Input module Mounting ! ATTENTION! During panel or DIN rail mounting of all devices, be sure that all debris (metal chips, wire strands, etc.) is kept from falling into the module. Debris that falls into the module could cause damage at power up. Minimum Spacing Maintain spacing from enclosure walls, wireways, adjacent equipment, etc. Allow 50 mm (2 in.
Chapter 3: Installation and Wiring 23 Panel Mounting Procedure Using Modules as a Template The following procedure allows you to use the assembled modules as a template for drilling holes in the panel. If you have sophisticated panel mounting equipment, you can use the dimensional template provided on the previous page. Due to module mounting hole tolerance, it is important to follow these procedures: 1. On a clean work surface, assemble no more than three modules. 2.
24 Compact IO™ Universal Input module Replacing a Single Module within a System The module can be replaced while the system is mounted to a panel (or DIN rail). Follow these steps in order: 1. Remove power. See important note at the beginning of this chapter. 2. On the module to be removed, remove the upper and lower mounting screws from the module (or open the DIN latches using a flat-blade or phillips-style screwdriver). 3. Move the bus lever to the right to disconnect (unlock) the bus. 4.
Chapter 3: Installation and Wiring Field Wiring Connections System Wiring Guidelines 25 Consider the following when wiring your system: General • Power and input wiring must be in accordance with Class 1, Division 2 wiring methods, Article 501-4(b) of the National Electric Code, NFPA 70, and in accordance with the authority having jurisdiction. • Channels are isolated from one another by ±10 Vdc maximum.
26 Compact IO™ Universal Input module Using the incorrect type of thermocouple extension wire or not following the correct polarity will cause invalid readings. • To ensures optimum accuracy, limit overall cable impedance by keeping a cable as short as possible. Locate the module as close to input devices as the application permits. Grounding ! ATTENTION! The possibility exists that a grounded or exposed thermocouple can become shorted to a potential greater than that of the thermocouple itself.
Chapter 3: Installation and Wiring 27 Terminal Door Label A removable, write-on label is provided with the module. Remove the label from the door, mark your unique identification of each terminal with permanent ink, and slide the label back into the door. Your markings (ID tag) will be visible when the module door is closed. Removing and Replacing the Terminal Block When wiring the module, you do not have to remove the terminal block.
28 Compact IO™ Universal Input module Wire Size and Terminal Screw Torque Each terminal accepts up to two wires with the following restrictions: Wire Type Wire Size Solid Cu-90°C (194°F) #14 to #22 AWG (1.63 to 0.65 mm) Stranded Cu-90°C (194°F) #16 to #22 AWG Terminal Screw Torque Retaining Screw Torque 0.68 Nm (6 in-lbs) 0.68 Nm (6 in-lbs) 0.46 Nm (4.1 in-lbs) 0.46 Nm (4.1 in-lbs) (1.63 to 0.65 mm) ! ATTENTION! Use supply wires suitable for 20°C above surrounding ambient.
Chapter 3: Installation and Wiring 29 3. At one end of the cable, twist the drain wire and foil shield together, bend them away from the cable, and apply shrink wrap. Then earth ground at the preferred location based on the type of sensor you are using. See Grounding for more details. 4. At the other end of the cable, cut the drain wire and foil shield back to the cable and apply shrink wrap. 5. Connect the signal wires to the terminal block. Connect the other end of the cable to the analog input device.
30 Compact IO™ Universal Input module NOTE: When using an ungrounded thermocouple, the shield must be connected to ground at the module end. ! IMPORTANT: When using grounded and/or exposed thermocouples that are touching electrically conductive material, the ground potential between any two channels cannot exceed ±10V dc, or temperature readings will be inaccurate.
Chapter 3: Installation and Wiring 31 terminal block. Do not mount the remote terminal block near heat sources, as it will cause inaccurate readings. ! ATTENTION! Do not remove or loosen the cold junction compensating thermistor assembly located between the two CJC terminals. The thermistor assembly must be installed to ensure accurate thermocouple input readings on channels configured for thermocouple.
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Chapter 4: Module Data, Status, and Configuration 33 Chapter 4 Module Data, Status, and Channel Configuration After installing the 1769-IF8u universal input module, you must configure it for operation, usually using the programming software compatible with the controller (for example, RSLogix 500 or RSLogix 5000). Once configuration is complete and reflected in the ladder logic, you need to operate the module and verify its configuration.
34 Compact IO™ Universal Input module Accessing Input Image File Data The input image file represents data words and status words. Input words 0 through 7 hold the input data that represents the value of the analog inputs for channels 0 through 7. These data words are valid only when the channel is enabled and there are no errors. Input words 8, 9 and 10 hold the status bits. To receive valid status information, the channel must be enabled.
Chapter 4: Module Data, Status, and Configuration 35 Input Data Not Valid Condition The general status bits S0 to S7 also indicate whether or not the input data for a particular channel, 0 through 7, is being properly converted (valid) by the module.
36 Compact IO™ Universal Input module operating range for the represented channel or sensor. The module automatically resets (0) the bit when the under-range condition is cleared and the data value is within the normal operating range. The Under-range bit for the CJC sensor is contained in word 10, bit 13. Note: The CJC temperature can be monitored using bits 0 through 11 in input word 10. See table 4.1 for details.
Chapter 4: Module Data, Status, and Configuration 37 Jumper setting for current type input This includes all current type inputs (i.e. 0 to 20 mA and 4 to 20 mA) Jumper setting for non-current type input Includes input types such as thermocouples, RTDs, resistance and all voltage ranges. Module Configuration (Word 0) Module configuration word C:e.0 contains the bits to enable or disable cyclic calibration and the CJC sensor, for the module.
38 Compact IO™ Universal Input module cycle occurs once for all enabled channels. If the function remains enabled, a calibration cycle occurs every five minutes thereafter. The calibration cycle of each enabled channel is staggered over several module scan cycles within the five minute period to limit impact on the system response speed. See Effects of Autocalibration on Module Update Time. Note: The configuration file can also be modified through the control program, if supported by the controller.
Chapter 4: Module Data, Status, and Configuration 39 CJC Display If enabled (default is disabled), all channel data is overridden with that channel’s CJC temperature. If disabled, channel data is presented in the input table as normal. Cyclic Calibration If enabled (default), the module’s internal calibration for the ADC is run once every 5 minutes. If disabled, it is executed only once at power on/ reset and not again.
40 Compact IO™ Universal Input module Channel Configuration (Words 2 to 9) The default value of the configuration data is represented by zeros in the data file. The structure of the channel configuration file is shown below. W ord/Bit 15 2 4 W ire RTD Enable 3 4 W ire RTD Enable 4 4 W ire RTD Enable 5 4 W ire RTD Enable 6 4 W ire RTD Enable 7 4 W ire RTD Enable 8 4 W ire RTD Enable 9 4 W ire RTD Enable 14 Cyclic Lead Comp. Disable Cyclic Lead Comp. Disable Cyclic Lead Comp.
Chapter 4: Module Data, Status, and Configuration To Select Make these bit settings 15 14 13 12 11 10 Enabled Disabled Filter Frequency 60 Hz 50 Hz 10 Hz 250 Hz 500 Hz 1 kHz Upscale Open Circuit Downscale Last State Zero 4 to 20 mA Input Type 0 to 20 mA -10 to 10 V 0 to 10 V 1 to 5 V 0 to 5 V +/-100 mV +/-50 mV Type J TC Type K TC Type T TC Type E TC Type R TC Type S TC Type B TC Type N TC Type C TC 100 Pt 385 200 Pt 385 500 Pt 385 1000 Pt 385 100 Pt 3916 200 Pt 3916 500 Pt 3916 1000 Pt 3916 10 Cu 426 12
42 Compact IO™ Universal Input module Enabling 2/4 Wire RTD (Bit 15) Setting bit 15 to a one enables 2/4 wire RTD on the associated channel. Note: Bits 14 and 15 are used for RTD and resistance modes only. They are used to specify 2, 3, or 4 wire RTD modes. 2-wire RTD mode is implemented when cyclic lead compensation (bit14) is disabled and 2/4wire(bit15) is enabled 3-wire RTD and resistance is implemented by enabling cyclic lead compensation and disabling 2/4 wire.
Chapter 4: Module Data, Status, and Configuration 43 Table 4.
44 Compact IO™ Universal Input module +32767. See Determining Effective Resolution and Range within this chapter. Engineering Units x 1 When using this data format, the module scales the input data to the actual engineering values for the selected input type. Values are expressed with an assumed decimal place. Refer to Table 4.2 for details. NOTE Use the engineering units x 10 setting to produce temperature readings in whole degrees Celsius or Fahrenheit.
Chapter 4: Module Data, Status, and Configuration 45 Selecting Input Type (Bits 10 through 6) Bits 10 through 6 in the channel configuration word indicate the type of input device. If channels 1, 3, 5, or 7 are configured for RTD or Resistance type, the configuration for the following even channels (2, 4, 6, 8) are ignored, respectively. It is recommended to set both channels identically (1 and 2, 3 and 4, 5 and 6, or 7 and 8) when setting a channel to RTD or Resistance mode.
46 Compact IO™ Universal Input module Selecting Input Filter Frequency (Bits 3 through 1) The input filter selection field allows you to select the filter frequency for each channel and provides system status of the input filter setting for channels 0 through 7.
Chapter 4: Module Data, Status, and Configuration 47 to reach 100% of its expected final value, given a full-scale step change in the input signal. This means that if an input signal changes faster than the channel step response, a portion of that signal will be attenuated by the channel filter. The channel step response is calculated by a settling time of 3 x (1/filter frequency). Table 4.
48 Compact IO™ Universal Input module Figure 4.1 Frequency Response Graphs The cut-off frequency for each channel is defined by its filter frequency selection.
Chapter 4: Module Data, Status, and Configuration 49 below that of the filter’s cut-off frequency. The cut-off frequency should not be confused with the update time. The cut-off frequency relates to how the digital filter attenuates frequency components of the input signal. The update time defines the rate at which an input channel is scanned and its channel data word is updated. Enabling or Disabling a Channel (Bit 0) You can enable or disable each of the six channels individually using bit 15.
50 Compact IO™ Universal Input module Deter mining Determining Effective Resolution and Range The effective resolution for an input channel depends upon the filter frequency selected for that channel. The following tables provide the effective resolution for each of the range selections at the six available frequencies. The tables do not include the affects of unfiltered input noise. Choose the frequency that most closely matches your requirements. Table 4.6a Effective Resolution(In counts) vs.
Chapter 4: Module Data, Status, and Configuration 51 Table 4.6b Effective Resolution(In units) vs. Input Filter Selection Input Type 4to20mA 0to20mA -10V to +10V 0to10V 1to5V 0to5V -100mV to +100mV -50mV to +50mV Type J-TC Type K-TC Type T-TC Type E-TC Type R-TC Type S-TC Type B-TC Type N-TC Type C-TC 100 Pt 385 200 Pt 385 500 Pt 385 1000 Pt 385 100 Pt 3916 200 Pt 3916 500 Pt 3916 1000 Pt 3916 10 Cu 426 120 Ni 618 120 Ni 672 604 NiFe 518 150 ohm 1000 ohm 3000 ohm 60Hz 0.000000 0.000000 0.000000 0.
52 Compact IO™ Universal Input module Deter mining Module Determining Update Time The module update time is defined as the time required for the module to sample and convert the input signals of all enabled input channels and provide the resulting data values to the processor. Module update time can be calculated by adding the sum of all enabled channel’s times. The module sequentially samples the enabled channels in a continuous loop. Channel update time is dependent upon the input filter selection.
Chapter 4: Module Data, Status, and Configuration 53 If you enable the cyclic autocalibration function, the module update time increases when the autocalibration occurs. To limit its impact on the module update time, the autocalibration function is divided over two module scans. The first part (offset/0) of a channel calibration adds 73 ms and the second part (gain/span) adds 101 ms to the module update. This takes place over two consecutive module scans.
54 Compact IO™ Universal Input module From Table 4.
Chapter 4: Module Data, Status, and Configuration 55 Impact of Autocalibration on Module Startup During Mode Change Regardless of the selection of the Enable/Disable Cyclic Calibration function, an autocalibration cycle occurs automatically on a mode change from Program-to-Run and on subsequent module startups/initialization for all configured channels. During module startup, input data is not updated by the module and the General Status bits (S0 to S7) are set to 1, indicating a Data Not Valid condition.
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Chapter 5: Diagnostics and Troubleshooting 57 Chapter 5 Diagnostics and Troubleshooting This chapter describes troubleshooting the universal input module. This chapter contains information on: safety considerations while troubleshooting internal diagnostics during module operation module errors contacting Spectrum Controls, Inc. for technical assistance Safety Considerations Safety considerations are an important element of proper troubleshooting procedures.
58 Compact IO™ Universal Input module (EMI), improper grounding, improper wiring connections, and unauthorized tampering. If you suspect a program has been altered, check it against a previously saved master program. Safety Circuits Circuits installed on the machine for safety reasons, like over-travel limit switches, stop push buttons, and interlocks, should always be hard-wired to the master control relay.
Chapter 5: Diagnostics and Troubleshooting If m odule status LED Indicated is: condition On Proper Operation Of f Channel Diagnostics Module Fault 59 Corrective action: No action required Cycle power. If condition persists, replace the module. Call your local distributor or Spectrum Controls for assistance. When an input channel is enabled, the module performs a diagnostic check to see that the channel has been properly configured.
60 Compact IO™ Universal Input module Open-Circuit Detection On every other module scan, the module performs an open-circuit test on all enabled channels. Whenever an open-circuit condition occurs, the open-circuit bit for that channel is set in input data word 8.
Chapter 5: Diagnostics and Troubleshooting Module Error Definition Table 61 Analog module errors are expressed in two fields as four-digit Hex format with the most significant digit as “don’t care” and irrelevant. The two fields are “Module Error” and “Extended Error Information”. The structure of the module error data is shown below. Table 5.
Compact IO™ Universal Input module 62 error field, the extended error information field can contain error codes that are module-specific or common to all 1769 analog modules. NOTE If no errors are present in the module error field, the extended error information field is set to zero. Hardware Errors General or module-specific hardware errors are indicated by module error code 001. See Table 5.3 Extended Error Codes.
Chapter 5: Diagnostics and Troubleshooting Module Inhibit Function Some controllers support the module inhibit function. See your controller manual for details. Whenever the 1769sc-IF8u module is inhibited, the module continues to provide information about changes at its inputs to the 1769 CompactBus master (for example, a CompactLogix controller).
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Appendix A 1769sc-IF8U Specifications This appendix lists the specifications for the 1769sc-IF8U Analog Input module.
66 Compact IO™ Universal Input Module Voltage Inputs Current Inputs RTD I nputs Resistance I nputs System accuracy at 2 5°C (10, 50, and 60 Hz filters): +/- 15 u V maximum for +/ - 50 mV inputs @ 25°C fo r 10 Hz, 50 Hz and 60 Hz filters. +/- 20 u V maximum for +/ - 100 mV inputs @ 25°C f or 10 Hz, 50 Hz and 60 Hz filters. +/- 2.5 mV maximum for 0-5V inputs @ 25°C for 10 Hz, 5 0 Hz and 60 Hz filters. +/- 2 mV maximum fo r 1-5V inputs @ 25° C for 10 Hz, 50 Hz and 60 Hz filte rs.
Appendix A: Specifications: Thermocouple Type B Thermocouple Type C Millivolt Inputs Voltage Inputs Current Inputs RTD/Resistance Platinum 385 Platinum 3916 Copper Nickel Nickel-Iron 0-150 ohm 0-1000 ohm 0-3000 ohm +/- 0.7 °C +/- 0.2 °C +/- 3 uV +/- 150 mV +/- 0.3 uA Temp. Coefficient Temperature compensation done by periodic calibration. Data formats Input Filter Eng units, Eng units X10, Scaled for PID, Prop.
68 Compact IO™ Universal Input Module Environmental Conditions Mechanical Vibration/Shock Unpack Shock & Vibration (op) Free Fall Unpackaged (non-op) Shock Unpackaged (op) Packaging Tests Temperature Temp Cycle (op) Standard Class/Limit IEC 68-2-6 FC ICCG-ES #001 A. IEC 68-2-32#1 IEC 68-2-27Ea ICCG-ES #002 A. NSTA Class III IEC 68-2-14Nb ICCG-ES #006 C.
Appendix B T w o’ s Complement Binar y o’s Number s The processor memory stores 16-bit binary numbers. Two’s complement binary is used when performing mathematical calculations internal to the processor. Analog input values from the analog modules are returned to the processor in 16-bit two’s complement binary format. For positive numbers, the binary notation and two’s complement binary notation are identical.
70 Compact IO™ Universal Input Modules Negative Decimal Values In two’s complement notation, the far left position is always 1 for negative values. The equivalent decimal value of the binary number is obtained by subtracting the value of the far left position, 32768, from the sum of the values of the other positions. In the figure below (all positions are 1), the value is 32767 - 32768 = -1.
Appendix B: Two’s Complement Binary Numbers 71
Appendix C T her mocouple Descriptions The information in this appendix was extracted from the NIST Monograph 175 issued in January 1990, which supersedes the IPTS-68 Monograph 125 issued in March 1974. NIST Monograph 175 is provided by the United States Department of Commerce, National Institute of Standards and Technology.
74 Compact IO™ Universal Input Module thermoelements will typically have significant impurities of elements such as palladium, iridium, iron, and silicon [38]. Studies by Ehringer [39], Walker et al. [25,26], and Glawe and Szaniszlo [24] have demonstrated that thermocouples, in which both legs are platinum-rhodium alloys, are suitable for reliable temperature measurements at high temperatures.
Appendix C: Thermocouple Descriptions 75 percent. Tolerances are not specified for type B thermocouples below 870°C. The suggested upper temperature limit of 1700°C given in the ASTM standard [7] for protected type B thermocouples applies to AWG 24 (0.51 mm) wire. This temperature limit applies to thermocouples used in conventional closed-end protecting tubes and it is intended only as a rough guide to the user. It does not apply to thermocouples having compacted mineral oxide insulation.
76 Compact IO™ Universal Input Module sulfurous, reducing, or alternately reducing and oxidizing atmospheres unless suitably protected with protecting tubes. They also should not be used in vacuum (at high temperatures) for extended times because the chromium in the positive thermoelement, a nickel-chromium alloy, vaporizes out of solution and alters the calibration. In addition, their use in atmospheres that promote “green-rot” corrosion of the positive thermoelement should be avoided.
Appendix C: Thermocouple Descriptions 77 are intended only as a rough guide to the user. They do not apply to thermocouples having compacted mineral oxide insulation. Type J Thermocouples This section discusses Iron Versus Copper-Nickel Alloy (SAMA) thermocouples, called type J thermocouples. A type J thermocouple is one of the most common types of industrial thermocouples, because of its relatively high Seebeck coefficient and low cost.
78 Compact IO™ Universal Input Module rusts in moist atmospheres and may become brittle, type J thermocouples are not recommended for use below 0°C. In addition, they should not be used unprotected in sulfurous atmospheres above 500°C. The positive thermoelement, iron, is relatively insensitive to composition changes under thermal neutron irradiation, but does exhibit a slight increase in manganese content.
Appendix C: Thermocouple Descriptions 79 above 500°C. The positive thermoelement, KP, which is the same as EP, is an alloy that typically contains about 89 to 90 percent nickel, 9 to about 9.5 percent chromium, both silicon and iron in amounts up to about 0.5 percent, plus smaller amounts of other constituents such as carbon, manganese, cobalt, and niobium. The negative thermoelement, KN, is typically composed of about 95 to 96 percent nickel, 1 to 1.5 percent silicon, 1 to 2.3 percent aluminum, 1.6 to 3.
80 Compact IO™ Universal Input Module Both thermoelements of type K thermocouples are reasonably stable, thermoelectrically, under neutron irradiation since the resulting changes in their chemical compositions due to transmutation are small. The KN thermoelements are somewhat less stable than the KP thermoelements in that they experience a small increase in the iron content accompanied by a slight decrease in the manganese and cobalt contents.
Appendix C: Thermocouple Descriptions 81 type E thermocouples which are the most suitable of the letter-designated thermocouples types for measurements down to 20K. Nevertheless, types NP and NN thermoelements do have a relatively low thermal conductivity and good resistance to corrosion in moist atmospheres at low temperatures. Type N thermocouples are best suited for use in oxidizing or inert atmospheres.
82 Compact IO™ Universal Input Module manganese content to achieve the most stable performance. The use of special Ni-Cr based alloys for sheathing to improve the chemical and physical compatibility with the thermoelements also has been investigated by Burley [54-56] and by Bentley [57-60]. Neither thermoelement of a type N thermocouple is extremely sensitive to minor differences in heat treatment (provided that the treatment does not violate any of the restrictions mentioned above).
Appendix C: Thermocouple Descriptions 83 applications and that meet the calibration tolerances described later in this section. It does not cover, however, the higher-purity, reference-grade materials that traditionally were used to construct thermocouples used as transfer standards and reference thermometers in various laboratory applications and to develop reference functions and tables [22,23].
84 Compact IO™ Universal Input Module positive thermoelement, which typically contains 10.00 ± 0.05 percent rhodium by weight. The consensus standard [21] describes the purity of commercial type S materials that are used in many industrial thermometry applications and that meet the calibration tolerances described later in this section.
Appendix C: Thermocouple Descriptions 85 contamination usually causes negative changes [25,26,29] in the thermoelectric voltage of the thermocouple with time, the extent of which will depend upon the type and amount of chemical contaminant. Such changes were shown to be due mainly to the platinum thermoelement [25,26,29].
86 Compact IO™ Universal Input Module Type T Thermocouples This section describes Copper Versus Copper-Nickel Alloy thermocouples, called type T thermocouples. This type is one of the oldest and most popular thermocouples for determining temperatures within the range from about 370°C down to the triple point of neon (-248.5939°C).
Appendix C: Thermocouple Descriptions 87 impurities present in these nearly pure materials. The high thermal conductivity of the type TP thermoelements can also be troublesome in precise applications. For these reasons, type T thermocouples are generally unsuitable for use below about 20K. Type E thermocouples are recommended as the most suitable of the letter-designated thermocouple types for general low-temperature use, since they offer the best overall combination of desirable properties.
88 Compact IO™ Universal Input Module 24 or 28 (0.51 mm or 0.33 mm), and 150°C for AWG 30 (0.25 mm). These temperature limits apply to thermocouples used in conventional closed-end protecting tubes and they are intended only as a rough guide to the user. They do not apply to thermocouples having compacted mineral oxide insulation. References [1] Preston-Thomas, H. The International Temperature Scale of 1990 (ITS-90). Metrologia 27, 3-10; 1990. ibid. p. 107.
Appendix C: Thermocouple Descriptions 89 letter-designated base-metal thermocouples. Temperature: Its Measurement and Control in Science and Industry; Vol. 5, Schooley, J. F., ed.; New York: American Institute of Physics; 1982. 1159-1166. [14] Potts, J. F. Jr.; McElroy, D. L. The effects of cold working, heat treatment, and oxidation on the thermal emf of nickel-base thermoelements. Herzfeld, C. M.; Brickwedde, F. G.; Dahl, A. I.; Hardy, J. D., ed.
90 Compact IO™ Universal Input Module Industry; Vol. 6; Schooley, J. F., ed.; New York: American Institute of Physics; 1992. 559-564. [24] Glawe, G. E.; Szaniszlo, A. J. Long-term drift of some noble- and refractory-metal thermocouples at 1600K in air, argon, and vacuum. Temperature: Its Measurement and Control in Science and Industry; Vol. 4; Plumb, H. H., ed.; Pittsburgh: Instrument Society of America; 1972. 1645-1662. [25] Walker, B. E.; Ewing, C. T.; Miller, R. R.
Appendix C: Thermocouple Descriptions 91 heat treatment on standard thermocouples. National Research Council of Canada Publication APH 2213/NRCC 17408; 1979. [33] McLaren, E. H.; Murdock, E. G. Properties of some noble and base metal thermocouples at fixed points in the range 0-1100°C. Temperature: Its Measurement and Control in Science and Industry; Vol. 5; Schooley, J. F., ed.; New York: American Institute of Physics; 1982. 953-975. [34] Bentley, R. E.; Jones, T. P.
92 Compact IO™ Universal Input Module reference data. Natl. Bur. Stand. (U.S.) Monogr. 161; 1978 April. 167p. [45] Burley, N. A.; Jones, T. P. Practical performance of nicrosil-nisil thermocouples. Temperature Measurement, 1975; Billing, B. F.; Quinn, T. J., ed.; London and Bristol: Institute of Physics; 1975. 172180. [46] Burley, N. A.; Hess, R. M.; Howie, C. F. Nicrosil and nisil: new nickel-based thermocouple alloys of ultra-high thermoelectric stability.
Appendix C: Thermocouple Descriptions 93 and Industry; Vol. 6; Schooley, J. F., ed.; New York: American Institute of Physics; 1992. 595-600. [54] Burley, N. A. N-CLAD-N: A novel advanced type N integrallysheathed thermocouple of ultra-high thermoelectric stability. High Temperatures- High Pressures 8, 609-616; 1986. [55] Burley, N. A. A novel advanced type N integrally-sheathed thermocouple of ultra-high thermoelectric stability. Thermal and Temperature Measurement in Science and Industry; 3rd Int.
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Appendix D Using T her mocouple J unctions Junctions This appendix describes the types of thermocouple junctions available, and explains the trade-offs in using them with the 1769-IF8u thermocouple/mV analog input module. ! ATTENTION Take care when choosing a thermocouple junction, and connecting it from the environment to the module. If you do not take adequate precautions for a given thermocouple type, the electrical isolation of the module might be compromised.
96 Compact IO™ Universal Input Module and sheath (sheaths are tied together). It should be noted that the isolation is removed even if the sheaths are connected to chassis ground at a location other than the module, since the module is connected to chassis ground.
Appendix D: Using Thermocouple Junctions 97 example, ceramic). An alternative is to float the metal sheath with respect to any path to chassis ground or to another thermocouple metal sheath. Thus, the metal sheath must be insulated from electrically conductive process material, and have all connections to chassis ground broken. Note that a floated sheath can result in a less noise-immune thermocouple signal.
98 Compact IO™ Universal Input Module To prevent violation of channel-to-channel isolation: · For multiple exposed junction thermocouples, do not allow the measuring junctions to make direct contact with electrically conductive process material. · Preferably use a single exposed junction thermocouple with multiple ungrounded junction thermocouples. · Consider using all ungrounded junction thermocouples instead of the exposed junction type.
Appendix D: Using Thermocouple Junctions 99
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Appendix E Module Configuration Using MicroLogix 1500 and RSLogix 500 This appendix examines the 1769sc-IF8U module’s addressing scheme and describes module configuration using RSLogix 500 and a MicroLogix 1500 controller. Module Addressing The following memory map shows the input and configuration image tables for the module. Detailed information on the image table is located in Chapter 4.
102 Compact IO™ Universal Input Module For example, to obtain the general status of channel 2 of the module located in slot e, use address I:e.6/2. NOTE The end cap does not use a slot address. 1769sc-IF8U Configuration File The configuration file contains information you use to define the way a specific channel functions. The configuration file is explained in more detail in Configuring Channels in chapter 4. The configuration file is modified using the programming software configuration screen.
Appendix E: Module Configuration Using MicroLogix 1500 and RSLogix 500 Configuring the 1769sc-IF8U in a MicroLogix 1500 System 103 This example takes you through configuring your 1769scIF8U universal analog input module with RSLogix 500 programming software, assumes your module is installed as expansion I/O in a MicroLogix 1500 system, and that RSLinx™ is properly configured and a communications link has been established between the MicroLogix processor and RSLogix 500.
104 Compact IO™ Universal Input Module This screen allows you to manually enter expansion modules into expansion slots, or to automatically read the configuration of the controller. To read the existing controller configuration, click on the Read IO Config button. A communications dialog appears, identifying the current communications configuration so that you can verify the target controller. If the communication settings are correct, click on Read IO Config. The actual I/O configuration is displayed.
Appendix E: Module Configuration Using MicroLogix 1500 and RSLogix 500 105 I/O is attached to the MicroLogix 1500 processor. The 1769sc-IF8U module is installed in slot 1. To configure the module, double-click on the module/slot. The general configuration screen appears.
106 Compact IO™ Universal Input Module ! When using the read IO configuration feature in RSLogix, you need to manualy enter 18 into the “extra data length” field. To configure the module select the Generic Extra Data Configuration tab. Enter the decimal equivalent of each configuration word. There are a total of 18 words that need to be configured altogether. The module default settings are used if all the configuration words are left at zero..
Appendix F Conf iguring Your 1769sc-IF8U Configuring Module for CompactLogix Controllers in RSLogix 5000 The 1769sc-IF8U module can be configured in RSLogix 5000 using either the AOP (Add On Profile) or the generic module profile depending on the level of firmware installed on the PLC. The AOP can be used on controllers running firmware version 15 or higher. The generic profile must be used on controllers running firmware level 14 or older.
108 Compact IO™ Universal Input Module In the Controller Organizer on the left of the screen, right click on “[0] CompactBus Local”, select New Module, and the following screen appears:
Appendix F: Configuring Your 1769sc-IF8U Module for CompactLogix Controllers in RSLogix 5000 109 This screen is used to narrow your search for I/O modules to configure into your system. With the initial release of the CompactLogix5320 controller, this screen only includes the “Generic 1769 Module”. Click the OK button and the following default Generic Profile screen appears: First, select the Comm Format (“Input Data – INT” for the 1769sc-IF8U), then fill in the name field.
110 Compact IO™ Universal Input Module the module type in the Controller Organizer. The Description field is optional and may be used to provide more details concerning this I/O module in your application. The slot number must be selected next, although it will begin with the first available slot number, 1, and increments automatically for each subsequent Generic Profile you configure. For this example, the 1769sc-IF8U Universal module is located in slot 1.
Appendix F: Configuring Your 1769sc-IF8U Module for CompactLogix Controllers in RSLogix 5000 Configuring I/O Modules 111 Once you have created a Generic Profile for 1769sc-IF8U Universal module, you must enter configuration information into the Tag database that is automatically created from the Generic Profile information you entered. This configuration information is downloaded to each module at program download, at power up, and when an inhibited module is uninhibited.
112 Compact IO™ Universal Input Module In order to configure an I/O module, you must open up the configuration tag for that module by clicking on the plus sign to the left of the configuration tag in the Controller Tag data base. Configuring a 1769sc-IF8U Universal Module To configure the 1769sc-IF8U module in slot 1, click on the plus sign left of Local:1:C. Configuration data is entered under the Local:1:C.Data tag. Click the plus sign to the left of Local:1:C.
Appendix F: Configuring Your 1769sc-IF8U Module for CompactLogix Controllers in RSLogix 5000 113 Once you have entered your configuration selections for each channel, enter your program logic, save your project, and download it to your CompactLogix Controller. Your module configuration data is downloaded to your I/O modules at this time. Your 1769sc-IF8U module input data is located in the following tag addresses when the controller is in Run mode. 1769sc-IF8U Channel Tag Address 0 Local:1:I.
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Getting Technical Assistance Note that your module contains electronic components which are susceptible to damage from electrostatic discharge (ESD). An electrostatic charge can accumulate on the surface of ordinary plastic wrapping or cushioning material. In the unlikely event that the module should need to be returned to Spectrum Controls, please ensure that the unit is enclosed in approved ESD packaging (such as static-shielding / metallized bag or black conductive container).
©2003, Spectrum Controls, Inc. All rights reserved. Specifications subject to change without notice. The Encompass logo and ControlLogix are trademarks of Rockwell Automation. Publication 0300198-03 Rev. B July 2012. Printed in U.S.A. Corporate Headquarters Spectrum Controls Inc. P.O. Box 6489 Bellevue, WA 98008 USA Fax: 425-641-9473 Tel: 425-746-9481 Web Site: www.spectrumcontrols.com E-mail: spectrum@spectrumcontrols.
