User's Manual Pub. 0300242‐01 Rev.
ii Flex™ IO Isolated RTD/Thermocouple Module 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.
iii Table of Contents IMPORTANT NOTES............................................................................................................................................ II NOTICE .............................................................................................................................................................. II LIMITED WARRANTY ..........................................................................................................................................
iv 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.
v PREFACE Read this preface to familiarize yourself with the rest of the manual.
vi 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 • Bold type identifies headings and sub-headings ! • Attention Are used to identify critical information to the reader User's Manual Pub. 0300242‐01 Rev.
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 • Data Formats and filter frequencies • Hardware Features • System overview and module operation • Auto-calibration Section 1.
1-2 Flex™ IO Isolated RTD/Thermocouple Module Input Type 120 Ω Ni α 0.672 604 Ω NiFe α 0.518 Resistance Voltage Range -80 to 260 ˚C -100 to 200 ˚C 0 to 150 Ω 0 to 1000 Ω 0 to 3000 Ω +/- 50 mV +/- 100 mV (-112 to 500 ˚F) (-148 to 392 ˚F) Section 1.
Chapter 1: Module Overview 1-3 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 1 2 4 Item Description 1 Module Catalog Number 2 Module key-switch position 3 Removable label 4 Power/Status LED 3 Section 1.6 System Overview The module communicates to the controller through the base unit bus interface.
1-4 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. See the block diagram below.
Chapter 2 Installation and Wiring This chapter will cover: • Compliance to European union directives • General considerations • Power requirements • Installing the module • Field wiring connections Section 2.1 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. 2.1.
2-2 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 21 and to circuits not exceeding Over Voltage Category II2(IEC 60664-1)3. 2.2.1 Hazardous Location Considerations This equipment is suitable for use in Class I, Division 2, Groups A, B, C, D or nonhazardous locations only.
Chapter 2: Installation and Wiring 2-3 2.2.3 Remove Power ! Attention Remove power before removing or inserting this module. When you remove or insert a module with power applied, an electrical arc may occur.
2-4 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 Power IF8u Module IF8u Module Frequency Input Module 24 VDC Note: All modules must be frequency or IRT8I modules for this configuration.
Chapter 2: Installation and Wiring 2-5 Wiring when total current draw is greater than 10A Combination Power Frequency Input Module IF8u Module Frequency Input Module 24 VDC 24 VDC Note: All modules powered by the same power supply must be frequency or IRT8I modules for this configuration. Total current draw through any base unit must not be greater than 10A Section 2.
2-6 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.
Chapter 2: Installation and Wiring 4) Repeat the above steps to install the next terminal base. 2.4.
2-8 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).
Chapter 2: Installation and Wiring 2-9 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.
2-10 Flex™ IO Isolated RTD/Thermocouple Module is seated when the latching mechanism (7) is locked into the module. 6) Repeat the above steps to install the next module in its terminal base unit. Section 2.5 Field Wiring Connections Wiring to the IRT8I module is made through the terminal base unit on which the module mounts. Compatible terminal base units are: Module 1794sc-IRT8I 1794-TB3G 1794-TB3GS Yes Yes 2.5.
Chapter 2: Installation and Wiring ! Attention ! 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 empty slot in your chassis. If the adapter does not recognize your module after installation is completed, cycle power to the adapter. Use supply wire for 10˚C above surrounding ambient.
2-12 Flex™ IO Isolated RTD/Thermocouple Module RTD/Resistance 2-wire 1 Jumper 0 2 3-wire 1 0 2 Thermocouple + - mV Source Numbers 0, 1, 2, and 3 are wiring numbers of the sensor used. For terminal numbers corresponding to R, IN+, IN-, I, refer to Terminal Base Unit Wiring Connections below.
Chapter 2: Installation and Wiring ! Attention 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. The following examples show how to wire the IF8U using the tables and diagrams listed above. Figure 2-2 (RTD & Resistance Wiring Diagram) R User's Manual Pub. 0300242‐01 Rev.
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.
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 1 2 4 Item 3 Description 1 Module Catalog Number 2 Module key-switch position 3 Removable label 4 Power/Status LED Table 2-4 (Module Status LED) Module State New Not Config Idle Active Fault Fatal Fault Condition Power up initialized complete and passed Self-Test.
2-16 Flex™ IO Isolated RTD/Thermocouple Module User's Manual Pub. 0300242‐01 Rev.
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.
3-2 Flex™ IO Isolated RTD/Thermocouple Module Figure 3-1 (Module Memory Map) Input Image I:0 to I:7( 8 words) (Input Data) Status Image S:0 to S:3 (4 Words) (Status Data) Read Read 1794sc-IRT8I Write Configuration Image C:0 to C:32 (33 words) (Configuration Data) Section 3.3 Configure Generic Profile The generic Flex module profile is used to represent the IRT8I module within RSLogix 5000 since there’s no custom profile available.
Chapter 3: Configuring the 1794sc-IRT8I for ControlLogix/CompactLogix 3-3 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. In this case, you don’t need to add a separate local communication module. 3.3.
3-4 Flex™ IO Isolated RTD/Thermocouple Module 3. Configure the local Ethernet bridge module. Name the module Enter IP address of ENBT Select the module’s slot number Select the module’s revision level Select electronic keying level Click OK 3.3.2 Add a Remote Ethernet Flex Adapter After you have added the local Ethernet communication module, you must add remote Ethernet communication modules. A remote Ethernet module is a module that resides in a separate chassis from the controller.
Chapter 3: Configuring the 1794sc-IRT8I for ControlLogix/CompactLogix 3-5 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. User's Manual Pub. 0300242‐01 Rev.
3-6 Flex™ IO Isolated RTD/Thermocouple Module Name the module Enter IP address of ENBT Select the comm. format Select the chassis size Select the module revision level Select electronic keying level Click OK 3.3.3 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.
Chapter 3: Configuring the 1794sc-IRT8I for ControlLogix/CompactLogix 3-7 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 (Always 8 for the IRT8I) Enter the config. size (Always 49 for the IRT8I) Enter the status size (Always 4 for the IRT8I) Click OK Section 3.
3-8 Flex™ IO Isolated RTD/Thermocouple Module [Name of remote communication module]:e:x.Data[0 to 184] e = IRT8I slot number x = Image Type (i.e. C, I, or O) Note: 185 words are allocated by the Generic Flex Module profile, but only 49 are actually used by the IRT8I module for configuration. In the example above, the configuration tags for the first IRT8I module would appear as shown in the image below.
Chapter 3: Configuring the 1794sc-IRT8I for ControlLogix/CompactLogix Usage (16 bit words): 15 14 13 12 11 C:7 Temp Disable Open Units CJC Circuit R1 Ch6 Ch6 Ch6 C:8 Temp Disable Open Units CJC Circuit R1 Ch7 Ch7 Ch7 C:9 CH0 User Low Alarm Threshold C:10 CH0 User High Alarm Threshold C:11 CH0 User Alarm Deadband C:12 CH1 User Low Alarm Threshold C:13 CH1 User High Alarm Threshold C:14 CH1 User Alarm Deadband C:15 CH2 User Low Alarm Threshold C:16 CH2 User High Alarm Threshold C:17 CH2 User Alarm Deadband C
3-10 Flex™ IO Isolated RTD/Thermocouple Module Bit 4 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 Bit 3 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 Bit 2 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 Bit 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 Bit 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 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 Pt α 0.385 1000 Ω Pt α 0.385 100 Ω Pt α 0.3916 200 Ω Pt α 0.
Chapter 3: Configuring the 1794sc-IRT8I for ControlLogix/CompactLogix 3-11 Table 3-5 (Data Format) Bit 10 Bit9 Bit 8 Format: 0 0 0 Engineering Units 0 0 1 Engineering Units X10 0 1 0 Raw/Proportional Counts 0 1 1 Scaled for PID 1 0 0 Percent of Full Scale 1 1 0 1 CJC EU 1 1 1 0 CJC Scaled for PID 1 1 1 1 CJC Percent of Full Scale 1 If selected, the CJC format will override all ranges/formats and report the indicated CJC value for this channel. Channel zero will report CJC0 directly.
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 Open Circuit Mode: 0 0 Zero analog value on broken input. 0 1 Set analog value to Max scale on broken input. 1 0 Set analog value to Min scale on broken input. 1 1 Previous Value 3.4.
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. In this case, user alarms are disabled, the deadband is ignored, and no fault is declared. Note: The data range is determined by the data format selected. The alarm deadband allows the user to define hysteresis for alarms.
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.
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. I:3 Channel 3 input Data. I:4 Channel 4 input Data. I:5 Channel 5 input Data. I:6 Channel 6 input Data. I:7 Channel 7 input Data.
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: 0 0 No Errors 0 1 CJC1 is broken. 1 0 CJC2 is broken. 1 1 Both CJC1 and CJC2 are broken. 3.5.8 Diagnostics [Word 11 (Bits 0 to 7)] The diagnostic byte is used to indicate module faults. Refer to the table below for more information.
Chapter 3: Configuring the 1794sc-IRT8I for ControlLogix/CompactLogix Hex Error Code: 0x51 0x52 0x53 0x54 0x55 0x56 0x57 0x59 0x5F 0x60 0x61 0x62 0x63 0x64 0x65 0x66 0x67 0x70 0x71 0x72 0x73 0x74 0x75 0x76 0x77 0x80 0x90 0x91 0x92 0x93 0x94 0x95 0x96 0x97 0xA0 0xA1 0xA2 0xA3 0xA4 0xA5 0xA6 0xA7 0xB0 0xB1 0xB2 0xB3 0xB4 0xB5 0xB6 0xB7 0xC0 0xC1 0xC2 User's Manual Pub. 0300242‐01 Rev.
3-18 Flex™ IO Isolated RTD/Thermocouple Module User's Manual Pub. 0300242‐01 Rev.
Appendix A Module Specifications Number of inputs Module Location Nominal input voltage ranges Supported thermocouple types Supported RTD/Resistance types Resolution User's Manual Pub. 0300242‐01 Rev. A 8 channels Cat. No.
A-2 Flex™ IO Isolated RTD/Thermocouple Module Data format Input Impedance Common mode rejection Isolation voltage (continuous voltage withstand rating) Open circuit protection Overvoltage capability Engineering Units X1 Engineering Units X10 Raw/Proportional Counts Scaled for PID Percent of full scale >1 M ohms for voltage, thermocouple, RTD and resistance inputs 60 db @ 5V peak-to-peak, 50…60 Hz User power to Backplane:24 VDC continuous Channel to Backplane: 24 VDC continuous Channel to Channel: 24 VD
Appendix A: Module Specifications ±50 mV range ±100 mV range Resistance Accuracy with 4.17 Hz filter 0-150 ohms range 0-1000 ohms range 0-3000 ohms range RTD Accuracy With 4.17 Hz filters Platinum 385 (100, 200, 500 and 1000 ohms) (IEC751 1983, Amend 2 1995; JISC 1604 1997) Platinum 3916 (100, 200, 500 and 1000 ohms) (JISC 1604: 1981) Nickel 618 (100 ohms) (DIN 43760 Sept. 1987) Nickel 672(120 ohms) (DIN 43760 Sept.
A-4 Flex™ IO Isolated RTD/Thermocouple Module Radiated RF immunity EFT/B immunity Surge transient immunity Conducted RF immunity Enclosure type rating Signal conductors Thermocouple Millivolt Category7 Power conductors Wire size Category7 Terminal screw torque for cage-clamp terminal base 7 IEC 61000-6-2: 10 V/m with 1 kHz sine-wave 80% AM from 30…2000 MHz 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: ±2 kV at 5 kHz on signal ports IEC
Appendix A: Module Specifications Certifications (when product is marked) User's Manual Pub. 0300242‐01 Rev. A A-5 UL Listed for Class I, Division 2 Group 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.
A-6 Flex™ IO Isolated RTD/Thermocouple Module User's Manual Pub. 0300242‐01 Rev.
Index 1 H 1794‐TB3G ∙ 2‐10 1794‐TB3GS ∙ 2‐10 Hazardous Location ∙ 2‐2 A A/D converter ∙ 1‐3 I Input Data ∙ 3‐15 Input Filter ∙ 3‐10 Input Type ∙ 1‐1, 3‐9 Installation ∙ 2‐5 B Base Unit ∙ 2‐3 block diagram ∙ 1‐4 Broken Input Alarm ∙ 3‐15 Broken Input Mode ∙ 3‐12 C K key‐switch ∙ 1‐3, 2‐15 L CJC ∙ 2‐12, 3‐12 Configuration ∙ 3‐7 LED Module Status ∙ 2‐15 Low Voltage Directive ∙ 2‐1 D M Data Format ∙ 1‐2, 3‐10 Data Ranges ∙ 3‐11 Deadband User Alarm Deadband ∙ 3‐12 Diagnostics ∙ 3‐16 DIN Rail ∙ 2‐5
Remote Ethernet Ethernet Flex Adapter ∙ 3‐4 U S Under Range ∙ 3‐15 User High Alarm ∙ 3‐12, 3‐15 User Low Alarm ∙ 3‐12, 3‐15 Slot Number ∙ 3‐8, 3‐13 W T Temperature Units ∙ 3‐12 User's Manual Pub. 0300242‐01 Rev.
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 / metalized bag or black conductive container).
©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 User's Manual Pub. 0300242‐01 Rev.
