1. Manuals
  2. Brands
  3. Spectrum Controls Manuals
  4. Control Unit
  5. 1794sc-IRT8I
  6. User manual

Spectrum Controls 1794sc-IRT8I User Manual

1794 isolated rtd/thermocouple module
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
User's Manual Pub. 0300242‐01 Rev. A
1794 Isolated
RTD/Thermocouple Module
Catalog Number: 1794sc-IRT8I

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the 1794sc-IRT8I and is the answer not in the manual?

Questions and answers

Related Manuals for Spectrum Controls 1794sc-IRT8I

Summary of Contents for Spectrum Controls 1794sc-IRT8I

  • Page 1 User's Manual Pub. 0300242‐01 Rev. A 1794 Isolated RTD/Thermocouple Module Catalog Number: 1794sc-IRT8I...

  • Page 2: Notice

    No patent liability is assumed by Spectrum Controls with respect to the use of any of the information, products, circuits, programming, or services referenced herein.

  • Page 3: Table Of Contents

    Table of Contents   IMPORTANT NOTES  ............................ II   NOTICE ................................ II   LIMITED WARRANTY ............................ II   CHAPTER 1 MODULE OVERVIEW ........................ 1‐1     .......................... 1‐1 ECTION    ENERAL  ESCRIPTION    ......................... 1‐1 ECTION    NPUT  YPES AND  ANGES    ............................ 1‐2 ECTION    ATA  ORMATS    .......................... 1‐2 ECTION    ILTER   REQUENCIES  ...
  • Page 4 Flex™ IO Isolated RTD/Thermocouple Module   3.5.1 Input Data [Words 0 to 7] ........................ 3‐15   3.5.2 UnderRange Alarms [Word 8 (Bits 0 to 7)] ..................... 3‐15   3.5.3 OverRange Alarm [Word 8 (Bits 8 to 15)] .................... 3‐15   3.5.4 User Low Alarm [Word 9 (Bits 0 to 7)] .................... 3‐15   3.5.5 User High Alarm [Word 9 (Bits 8 to 15)] .................... 3‐15   3.5.6 Open Circuit Alarm [Word 10 (Bits 0 to 7)] ..................... 3‐15   3.5.7 CJC Alarm [Word 10 (Bits 8 & 9)] ...................... 3‐16   3.5.8 Diagnostics [Word 11 (Bits 0 to 7)] ...................... 3‐16   APPENDIX A MODULE SPECIFICATIONS  ...................... A‐1 User's Manual Pub. 0300242‐01 Rev. A...
  • Page 5 This Manual As much as possible, we organized this manual to explain, in a task-by-task manner, how to install, configure, program, operate and troubleshoot a control system using the 1794sc-IRT8I. Related Documentation The table below provides a listing of publications that contain important information about Allen-Bradley PLC systems.
  • Page 6 Flex™ IO Isolated RTD/Thermocouple Module 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 •...

  • Page 7: Chapter 1 Module Overview

    Chapter 1 Module Overview This chapter describes the 1794sc-IRT8I Isolated Universal input module and explains how the module reads current, voltage, RTD, resistance and thermocouple/millivolt analog input data. Included is information about: • General description • Input types and ranges •...

  • Page 8: Section 1.3 Data Formats

    Flex™ IO Isolated RTD/Thermocouple Module Input Type Range 120 Ω Ni α 0.672 -80 to 260 ˚C (-112 to 500 ˚F) 604 Ω NiFe α 0.518 -100 to 200 ˚C (-148 to 392 ˚F) 0 to 150 Ω Resistance 0 to 1000 Ω 0 to 3000 Ω...

  • Page 9: Section 1.6 System Overview

    Chapter 1: Module Overview program. In either case, the module configuration is stored in the memory of the controller. Refer to your controller’s user manual for more information. The illustration below shows the module’s hardware features. Figure 1-1 Item Description Module Catalog Number Module key-switch position Removable label...
  • Page 10 Flex™ IO Isolated RTD/Thermocouple Module channel. The converter reads the signal and converts it as required for the type of input selected. If thermocouples are being utilized, the module continuously samples each CJC sensor and compensates for temperature changes at the terminal base cold junction, between the thermocouple wire and the input terminal.

  • Page 11: Chapter 2 Installation And Wiring

    2.1.1 EMC Directive The 1794sc-IRT8I module is tested to meet Council Directive 89/336/EEC Electromagnetic Compatibility (EMC) and the following standards, in whole or in part, documented in a technical construction file: •...

  • Page 12: Section 2.2 General Considerations

    Flex™ IO Isolated RTD/Thermocouple Module Section 2.2 General Considerations Flex I/O is suitable for use in an industrial environment when installed in accordance with these instructions. Specifically, this equipment is intended for use in clean, dry environments Pollution degree 2 and to circuits not exceeding Over Voltage Category (IEC 60664-1) 2.2.1 Hazardous Location Considerations...

  • Page 13: Remove Power

    Chapter 2: Installation and Wiring 2.2.3 Remove Power Remove power before removing or inserting this module. When you remove or insert a module with power applied, an electrical arc may occur. An electrical arc can cause personal injury or property damage Attention •...

  • Page 14: Wiring The Terminal Base Units (1794-Tb3G Shown)

    Flex™ IO Isolated RTD/Thermocouple Module 2.3.1 Wiring the Terminal Base Units (1794-TB3G shown) Do not daisy chain power or ground from the terminal base unit to any ac or dc digital module terminal base unit. Attention Daisy-chaining IF8u IF8u Frequency Input Power Module Module...

  • Page 15: Section 2.4 Installing The Module

    Chapter 2: Installation and Wiring Wiring when total current draw is greater than 10A Combination Frequency Input IF8u Frequency Input Power Module Module Module 24 VDC 24 VDC Note: All modules powered by the same power supply must be frequency or IRT8I modules for this configuration.
  • Page 16 Flex™ IO Isolated RTD/Thermocouple Module 3) Position the terminal base on the 35 x 7.5mm DIN rail A (A-B pt.no. 199-DR1; 46277-3) at a slight angle with hook B on the left side of the terminal base hooked into the right side of the unit on the left. Proceed as follows: User's Manual Pub. 0300242‐01 Rev. A...

  • Page 17: Panel/Wall Mounting

    Chapter 2: Installation and Wiring 4) Repeat the above steps to install the next terminal base. 2.4.2 Panel/Wall Mounting Installation on a wall or panel consists of: • Laying out the drilling points on the wall or panel • Drilling the pilot holes for the mounting screws •...
  • Page 18 Flex™ IO Isolated RTD/Thermocouple Module To install the mounting plate on a wall or panel: 1) Lay out the required points on the wall/panel as shown in the drilling dimension drawing. Drilling Dimensions for Panel/Wall Mounting of Flex IO 2) Drill the necessary holes for the #6 self-tapping mounting screws. 3) Mount the mounting plate (1) for the adapter module using two#6 self-tapping screws (18 included for mounting up to 8 modules and the adapter).

  • Page 19: Mounting The Irt8I Module On The Terminal Base Unit

    Chapter 2: Installation and Wiring Note: The adapter is capable of addressing eight modules. Do not exceed a maximum of eight terminal base units in your system. 2.4.3 Mounting the IRT8I Module on the Terminal Base Unit The IRT8I isolated input module mounts on a 1794-TB3G or TB3GS terminal base unit. 1) Rotate the key-switch (1) on the terminal base unit (2) clockwise to position 3 as required for the IRT8I module.

  • Page 20: Section 2.5 Field Wiring Connections

    Module 1794-TB3G 1794-TB3GS 1794sc-IRT8I 2.5.1 Field Wiring using a 1794-TB3G and TB3GS Terminal Base 1) Connect the individual signal wiring to numbered terminals on the 0–15 row (A) and 17–32 row(B) on the terminal base unit. Connect the input devices as shown in the wiring table on page 2-11 .
  • Page 21 Chapter 2: Installation and Wiring 2-11 The IRT8I module does not receive power from the backplane. +24V dc power must be applied to your module before operation. If power is not applied, the module position will appear to the adapter as an Attention empty slot in your chassis.
  • Page 22 2-12 Flex™ IO Isolated RTD/Thermocouple Module RTD/Resistance 2-wire Jumper Numbers 0, 1, 2, and 3 are wiring numbers of the 3-wire sensor used. For terminal numbers corresponding to R, IN+, IN-, I, refer to Terminal Base Unit Wiring Connections below. Thermocouple mV Source Table 2-2...
  • Page 23 Chapter 2: Installation and Wiring 2-13 Total current draw through the terminal base unit is limited to 10A. Separate power connections to the terminal base unit may be necessary. Attention The following examples show how to wire the IF8U using the tables and diagrams listed above.
  • Page 24 2-14 Flex™ IO Isolated RTD/Thermocouple Module Figure 2-3 (Thermocouple Wiring Diagram) Figure 2-4 (Millivolt Wiring Diagram) Digital and analog power must be supplied by an Isolated Secondary Limited Energy Low Voltage source. Attention User's Manual Pub. 0300242‐01 Rev. A...

  • Page 25: Section 2.6 Module Indicators

    Chapter 2: Installation and Wiring 2-15 Section 2.6 Module Indicators The IRT8I module has one status indicator (OK) that is on when power is applied and no hardware faults are present. See figure below. Figure 2-5 Item Description Module Catalog Number Module key-switch position Removable label Power/Status LED...
  • Page 26 2-16 Flex™ IO Isolated RTD/Thermocouple Module User's Manual Pub. 0300242‐01 Rev. A...

  • Page 27: Chapter 3 Configuring The 1794Sc-Irt8I Using Rslogix 5000

    Chapter 3 Configuring the 1794sc-IRT8I Using RSLogix 5000 This chapter covers the following subjects: • Things you should know • Module memory map • Configure generic profile • Module configuration • Reading input/status data Section 3.1 Things You Should Know This chapter describes how to configure the IRT8I module for the ControlLogix and CompactLogix system.

  • Page 28: Section 3.3 Configure Generic Profile

    Flex™ IO Isolated RTD/Thermocouple Module Figure 3-1 (Module Memory Map) Read Input Image I:0 to I:7( 8 words) (Input Data) Read 1794sc-IRT8I Status Image S:0 to S:3 (4 Words) (Status Data) Write Configuration Image C:0 to C:32 (33 words) (Configuration Data) Section 3.3...

  • Page 29: Add A Local Ethernet Bridge Module

    Chapter 3: Configuring the 1794sc-IRT8I for ControlLogix/CompactLogix Net port in the local chassis. In this case, you don’t need to add a separate local communication module. Note: When you create a new RSLogix 5000 project with the CompactLogix 1769-L23E, 1769-L32E or L35E controller, The Controller Organizer creates a Ethernet port in the local chassis.

  • Page 30: Add A Remote Ethernet Flex Adapter

    Ethernet communication modules. A remote Ethernet module is a module that resides in a separate chassis from the controller. If you plan to use the Flex Control Net adapter, you will need to install the 1794sc-IRT8I EDS file before scheduling the network. The latest EDS files can be found at (www.spectrumcontrols.com). Attention 1.
  • Page 31 Chapter 3: Configuring the 1794sc-IRT8I for ControlLogix/CompactLogix Right-click on the local communication module Select New Module 2. Select the module type from the Select Module Type pop-up. Select the remote Ethernet communication module. Click OK 3. Configure the remote Ethernet communication module.

  • Page 32: Add The Generic Flex Module

    After adding the remote Ethernet communication module, the Generic Flex Module must be added. The Generic Flex Module is required because there is no custom profile for the 1794sc-IRT8I module. The following steps must be followed to add the Generic Flex Module.

  • Page 33: Section 3.4 Module Configuration

    Chapter 3: Configuring the 1794sc-IRT8I for ControlLogix/CompactLogix Select Generic Flex Module Click OK 3. Configure the Generic Flex Module (i.e. 1794sc-IRT8I) Name the module Enter “Input Data – INT” for Comm. Format Enter module slot # Enter the input size Enter the config.
  • Page 34 Figure 3-2 (Configuration Tags Example) Note: The slot number is “0” and the Image type is “C” for configuration. The following table describes the configuration settings for the 1794sc-IRT8I module. Table 3-1 (Configuration Table) Usage (16 bit words):...

  • Page 35: Fault Mode [Word 0 (Bits 2,3,4,5,10,11,12,13)]

    Chapter 3: Configuring the 1794sc-IRT8I for ControlLogix/CompactLogix Usage (16 bit words): 11 10 2 1 0 C:7 Temp Disable Open Data Input Input Units Circuit Format Filter Type C:8 Temp Disable Open Data Input Input Units Circuit Format Filter Type...

  • Page 36: Input Filter

    3-10 Flex™ IO Isolated RTD/Thermocouple Module Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Range: K Type Thermocouple N Type Thermocouple R Type Thermocouple S Type Thermocouple T Type Thermocouple 100 Ω Pt α 0.385 200 Ω Pt α 0.385 500 Ω...
  • Page 37 Chapter 3: Configuring the 1794sc-IRT8I for ControlLogix/CompactLogix 3-11 Table 3-5 (Data Format) Bit 10 Bit9 Bit 8 Format: Engineering Units Engineering Units X10 Raw/Proportional Counts Scaled for PID Percent of Full Scale CJC EU CJC Scaled for PID CJC Percent of Full Scale If selected, the CJC format will override all ranges/formats and report the indicated CJC value for this channel.

  • Page 38: Open Circuit Mode [Words 1 - 8 (Bits 12 & 13)]

    3-12 Flex™ IO Isolated RTD/Thermocouple Module 3.4.5 Open Circuit Mode [Words 1 – 8 (Bits 12 & 13)] The open circuit mode determines the fail-safe data value each channel is to default to in the event of an open circuit condition. The table below lists the available options. Table 3-7 (Open Circuit Mode) Bit 13 Bit 12...

  • Page 39: Section 3.5 Read Input & Status Data

    Chapter 3: Configuring the 1794sc-IRT8I for ControlLogix/CompactLogix 3-13 deadband. If any of these rules are violated, a configuration error is declared, and the alarm is disabled. The notable exception is when the “low” is equal to the “high” and both are set to zero.
  • Page 40 3-14 Flex™ IO Isolated RTD/Thermocouple Module Figure 3-4 (Input/Status Tags) Note: The slot number is “0” and the image type is “I”. User's Manual Pub. 0300242‐01 Rev. A...

  • Page 41: Input Data [Words 0 To 7]

    Chapter 3: Configuring the 1794sc-IRT8I for ControlLogix/CompactLogix 3-15 The table below describes the input and status mapping. Table 3-10 (Input & Status) Usage (16 bit words): I:0 Channel 0 input Data. I:1 Channel 1 input Data. I:2 Channel 2 input Data.

  • Page 42: Cjc Alarm [Word 10 (Bits 8 & 9)]

    3-16 Flex™ IO Isolated RTD/Thermocouple Module 3.5.7 CJC Alarm [Word 10 (Bits 8 & 9)] The CJC alarm indicates a broken wire condition for both CJC sensors. Refer to the table below. Table 3-11 (CJC Alarms) Bit 9 Bit 8 CJC Alarm: No Errors CJC1 is broken.
  • Page 43 Chapter 3: Configuring the 1794sc-IRT8I for ControlLogix/CompactLogix 3-17 Hex Error Code: Diagnostic: 0x51 CH1_OUT_OF_RANGE_ERROR 0x52 CH2_OUT_OF_RANGE_ERROR 0x53 CH3_OUT_OF_RANGE_ERROR 0x54 CH4_OUT_OF_RANGE_ERROR 0x55 CH5_OUT_OF_RANGE_ERROR 0x56 CH6_OUT_OF_RANGE_ERROR 0x57 CH7_OUT_OF_RANGE_ERROR 0x59 Unused module cfg bits set 0x5F MODULE_NOT_CONFIGURED 0x60 CH0 Cal Offset CFG Error...
  • Page 44 3-18 Flex™ IO Isolated RTD/Thermocouple Module User's Manual Pub. 0300242‐01 Rev. A...
  • Page 45 Appendix A Module Specifications Number of inputs 8 channels Module Location Cat. No. 1794-TB3G, 1794-TB3GS Terminal Base Units Nominal input voltage ranges ±50 mV, ±100 mV Supported thermocouple types Type °C Range °F Range 300…1820 °C (572…3308 °F) 0…2315 °C (32…4199 °F) -270…1000 °C (-454…1832 °F) -210…1200 °C (-346…2192 °F) -270…1370 °C (-454…2498 °F)
  • Page 46 Flex™ IO Isolated RTD/Thermocouple Module Data format Engineering Units X1 Engineering Units X10 Raw/Proportional Counts Scaled for PID Percent of full scale Input Impedance >1 M ohms for voltage, thermocouple, RTD and resistance inputs Common mode rejection 60 db @ 5V peak-to-peak, 50…60 Hz Isolation voltage (continuous voltage User power to Backplane:24 VDC continuous withstand rating)

  • Page 47: Appendix A: Module Specifications

    Appendix A: Module Specifications ±50 mV range ±20uV ±35uV ±10uV ±100 mV range ±40uV ±60uV ±13uV Repeatability Accuracy Accuracy Limit Resistance Accuracy Limit Limit At 0- At °25C & 4.17 with 4.17 Hz filter °25C °55C Hz filter ±0.15 0-150 ohms range ohms ±0.25 ohms ±10 milliohms 0-1000 ohms range...
  • Page 48 Flex™ IO Isolated RTD/Thermocouple Module IEC 61000-6-2: 10 V/m with 1 kHz sine-wave 80% AM from 30…2000 MHz Radiated RF immunity 10 V/m with 200 Hz 50% Pulse 100% AM at 900 MHz 10 V/m with 200 Hz 50% Pulse 100% AM at 1890 MHz IEC 61000-6-2: EFT/B immunity...
  • Page 49 Appendix A: Module Specifications Certifications (when product is UL Listed for Class I, Division 2 Group marked) A,B,C,D Hazardous Locations, certified for U.S. and Canada. See UL File E180101. UL Listed Industrial Control Equipment, certified for U.S. and Canada. See UL File E140954. EEx European Union 94/9/EEC ATEX Directive, compliant with: EN 60079-15;...
  • Page 50 Flex™ IO Isolated RTD/Thermocouple Module User's Manual Pub. 0300242‐01 Rev. A...
  • Page 51 Index 1  H  1794‐TB3G ∙ 2‐10  Hazardous Location ∙ 2‐2  1794‐TB3GS ∙ 2‐10  I  A  Input Data ∙ 3‐15  A/D converter ∙ 1‐3  Input Filter ∙ 3‐10  Input Type ∙ 1‐1, 3‐9  Installation ∙ 2‐5  B  K  Base Unit ∙ 2‐3  block diagram ∙ 1‐4  Broken Input Alarm ∙ 3‐15  key‐switch ∙ 1‐3, 2‐15  Broken Input Mode ∙ 3‐12  L  C  LED  CJC ∙ 2‐12, 3‐12  Module Status ∙ 2‐15  Configuration ∙ 3‐7  Low Voltage Directive ∙ 2‐1  D  M  Data Format ∙ 1‐2, 3‐10  Memory Map ∙ 3‐1  Data Ranges ∙ 3‐11  Deadband  N  User Alarm Deadband ∙ 3‐12  Diagnostics ∙ 3‐16  DIN Rail ∙ 2‐5  Noise ∙ 2‐3  Drilling Dimensions ∙ 2‐8  O  E ...
  • Page 52 Remote Ethernet  U  Ethernet Flex Adapter ∙ 3‐4  Under Range ∙ 3‐15  User High Alarm ∙ 3‐12, 3‐15  S  User Low Alarm ∙ 3‐12, 3‐15  Slot Number ∙ 3‐8, 3‐13  W  T  Wiring ∙ 2‐10  Temperature Units ∙ 3‐12  User's Manual Pub. 0300242‐01 Rev. A...
  • Page 53 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 / metalized bag or black conductive container).
  • Page 54 ©2009, Spectrum Controls, Inc. All rights reserved. Specifications subject to change without notice. The Encompass logo and ControlLogix are trademarks of Rockwell Automation. Corporate Headquarters Spectrum Controls Inc. P.O. Box 5533 Bellevue, WA 98006 USA Fax: 425-641-9473 Tel: 425-746-9481 Web Site: www.spectrumcontrols.com E-mail: spectrum@spectrumcontrols.com...

Table of Contents