Rockwell Automation 1746-NR8 User Manual

SLC 500™ RTD/Resistance Input Module
(Catalog Number 1746-NR8)
User Manual

Important User Information

Because of the variety of uses for the products described in this publication, those responsible for the application and use of this control equipment must satisfy themselves that all necessary steps have been taken to assure that each application and use meets all performance and safety requirements, including any applicable laws, regulations, codes and standards.
The illustrations, charts, sample programs and layout examples shown in this guide are intended solely for purposes of example. Since there are many variables and requirements associated with any particular installation, Allen-Bradley does not assume responsibility or liability (to include intellectual property liability) for actual use based upon the examples shown in this publication.
Allen-Bradley publication SGI-1.1, Safety Guidelines for the Application, Installation and Maintenance of Solid-State Control (available from your local Allen-Bradley office), describes some important differences between solid-state equipment and electromechanical devices that should be taken into consideration when applying products such as those described in this publication.
Reproduction of the contents of this copyrighted publication, in whole or part, without written permission of Rockwell Automation, is prohibited.
Throughout this manual we use notes to make you aware of safety considerations:
ATTENTION
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IMPORTANT
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Table of Contents

Preface
Overview
Installation and Wiring
Who Should Use This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1
Purpose of This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1
Related Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-2
Common Techniques Used in this Manual. . . . . . . . . . . . . . . . . . . P-3
Rockwell Automation Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-3
Local Product Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-3
Technical Product Assistance. . . . . . . . . . . . . . . . . . . . . . . . . . . P-3
Your Questions or Comments on this Manual . . . . . . . . . . . . . P-3
Chapter 1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
RTD Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Resistance Device Compatibility . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Hardware Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
General Diagnostic Features . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
System Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
System Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Module to Processor Communication. . . . . . . . . . . . . . . . . . . 1-10
Chapter 2
Compliance to Europe Union Directives. . . . . . . . . . . . . . . . . . . . . 2-1
EMC Directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Electrostatic Damage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Hazardous Location Considerations . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Module Location in Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Modular Chassis Considerations . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Fixed Expansion Chassis Considerations . . . . . . . . . . . . . . . . . . 2-4
General Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Module Installation and Removal . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Removing the Terminal Block. . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Installing the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Removing the Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Terminal Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Wiring Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Wiring Resistance Devices (Potentiometers) to the Module . . 2-11
Wiring Input Devices to the Module. . . . . . . . . . . . . . . . . . . . 2-14
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
Factory Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
Autocalibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
Single-Point Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
i Publication 1746-UM003A-EN-P
Table of Contents ii
Preliminary Operating Considerations
Channel Configuration, Data, and Status
Chapter 3
Module ID Code. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Module Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Output Image - Configuration Words. . . . . . . . . . . . . . . . . . . . 3-4
Input Image - Data Words and Status Words . . . . . . . . . . . . . . 3-4
Channel Filter Frequency Selection. . . . . . . . . . . . . . . . . . . . . . . . . 3-5
1746-NR8 Channel Step Response . . . . . . . . . . . . . . . . . . . . . . 3-5
Effective Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Channel Cut-Off Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Channel Autocalibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Update Time and Scanning Process . . . . . . . . . . . . . . . . . . . . 3-10
Input Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
Output Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
Chapter 4
Channel Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Channel Configuration Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Configure Each Channel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Enter the Configuration Data . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Input Type Selection (Bits 0 through 3) . . . . . . . . . . . . . . . . . . 4-6
Data Format Selection (Bits 4 and 5) . . . . . . . . . . . . . . . . . . . . 4-6
Broken Input Selection (Bits 6 and 7) . . . . . . . . . . . . . . . . . . . 4-16
Temperature Units Selection (Bit 8) . . . . . . . . . . . . . . . . . . . . 4-17
Filter Frequency Selection (Bits 9 and 10). . . . . . . . . . . . . . . . 4-17
Channel Enable Selection (Bit 11). . . . . . . . . . . . . . . . . . . . . . 4-17
Excitation Current Selection (Bit 12) . . . . . . . . . . . . . . . . . . . 4-18
Calibration Disable (Bit 13) . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18
Lead Resistance Measurement Enable (Bits 14 and 15) . . . . . . 4-18
Channel Data Word . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19
Channel Status Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19
Input Type Status (Bits 0 through 3). . . . . . . . . . . . . . . . . . . . 4-22
Data Format Status (Bits 4 and 5) . . . . . . . . . . . . . . . . . . . . . . 4-22
Broken Input Status (Bits 6 and 7) . . . . . . . . . . . . . . . . . . . . . 4-22
Temperature Units Status (Bit 8) . . . . . . . . . . . . . . . . . . . . . . 4-22
Channel Filter Frequency (Bits 9 and 10) . . . . . . . . . . . . . . . . 4-23
Channel Enable Status (Bit 11) . . . . . . . . . . . . . . . . . . . . . . . . 4-23
Calibration Error (Bit 12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23
Broken Input Error (Bit 13) . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23
Out-Of-Range Error (Bit 14) . . . . . . . . . . . . . . . . . . . . . . . . . 4-24
Configuration Error (Bit 15) . . . . . . . . . . . . . . . . . . . . . . . . . . 4-24
Publication 1746-UM003A-EN-P
Ladder Programming Examples
Module Diagnostics and Troubleshooting
Table of Contents iii
Chapter 5
Device Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Initial Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Dynamic Programming. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
Verifying Channel Configuration Changes . . . . . . . . . . . . . . . . . . . 5-4
Interfacing to the PID Instruction. . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
Using the Proportional Counts Data Format
with the User-set Scaling (Class 3). . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Monitoring Channel Status Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
Invoking Autocalibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10
Chapter 6
Module Operation vs. Channel Operation . . . . . . . . . . . . . . . . . . . 6-1
Power-Up Diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Channel Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Error Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
Channel Status LEDs (Green). . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
Module Status LED (Green) . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
Replacement Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
Contacting Rockwell Automation . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
Application Examples
Specifications
Chapter 7
Basic Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Channel Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Program Listing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Supplementary Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
Channel Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4
Program Setup and Operation Summary. . . . . . . . . . . . . . . . . . 7-6
Program Listing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6
Appendix A
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Physical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
Input Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
Module Accuracy
RTD Temperature Ranges, Resolution, and Repeatability . . . . . . . A-3
RTD Accuracy and Temperature Drift Specifications . . . . . . . . . . . A-4
Resistance Device Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5
Cable Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5
RTD Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5
Publication 1746-UM003A-EN-P
Table of Contents iv
Configuration Worksheet for RTD/ Resistance Module
Appendix B
Glossary
Index
Publication 1746-UM003A-EN-P

Preface

Read this preface to familiarize yourself with the rest of the manual. This preface covers the following topics:
who should use this manual
the purpose of this manual
terms and abbreviations
conventions used in this manual
Allen-Bradley support

Who Should Use This Manual

Purpose of This Manual

Use this manual if you are responsible for designing, installing, programming, or troubleshooting control systems that use Allen-Bradley small logic controllers.
You should have a basic understanding of SLC 500™ products. You should understand programmable controllers and be able to interpret the ladder logic instructions required to control your application. If you do not, contact your local Allen-Bradley representative for information on available training courses before using this product.
This manual is a reference guide for the 1746-NR8 RTD/Resistance Input Module. The manual:
gives you an overview of system operation
explains the procedures you need to install and wire the module at the
customer site
provides ladder programming examples
provides an application example of how this input module can be used
to control a process
1 Publication 1746-UM003A-EN-P
Preface 2

Related Documentation

The following documents contain information that may be helpful to you as you use Allen-Bradley SLC™ products. To obtain a copy of any of the Allen-Bradley documents listed, contact your local Allen-Bradley office or distributor.
For Read this Document Document Number
An overview of the SLC 500 family of products SLC 500 System Overview 1747-SO001A-US-P A description on how to install and use your Modular SLC 500
programmable controller
A description on how to install and use your Fixed SLC 500 programmable controller
A reference manual that contains status file data, instruction set, and troubleshooting information about APS
A procedural and reference manual for technical personnel who use an HHT to develop control applications
An introduction to HHT for first-time users, containing basic concepts but focusing on simple tasks and exercises, and allowing the reader to begin programming in the shortest time possible
A resource manual and user’s guide containing information about the analog modules used in your SLC 500 system.
In-depth information on grounding and wiring Allen-Bradley programmable controllers
A description of important differences between solid-state programmable controller products and hard-wired electromechanical devices
A complete listing of current Allen-Bradley documentation, including ordering instructions. Also indicates whether the documents are available on CD-ROM or in multi-languages.
A glossary of industrial automation terms and abbreviations Allen-Bradley Industrial Automation Glossary AG-7.1 An article on wire sizes and types for grounding electrical equipment National Electrical Code Published by the
Installation and Operation Manual for Modular Hardware Style Programmable Controllers
Installation & Operation Manual for Fixed Hardware Style Programmable Controllers
SLC 500
and MicroLogix™ 1000 Instruction
Set Reference Manual Allen-Bradley Hand-Held Terminal User’s
Manual Getting Started Guide for HHT 1747-NM009
SLC 500 Analog I/O Modules User’s Manual 1746-6.4
Allen-Bradley Programmable Controller Grounding and Wiring Guidelines
Application Considerations for Solid-State Controls
Allen-Bradley Publication Index SD499
1747-6.2
1747-6.21
1747-6.15
1747-NP002
1770-4.1
SGI-1.1
National Fire Protection Association of Boston, MA.
Publication 1746-UM003A-EN-P
Preface 3

Common Techniques Used in this Manual

Rockwell Automation Support

The following conventions are used throughout this manual:
Bulleted lists such as this one provide information, not procedural steps.
Numbered lists provide sequential steps or hierarchical information.
Italic type is used for emphasis.
Rockwell Automation offers support services worldwide, with over 75 Sales/ Support Offices, 512 authorized Distributors and 260 authorized Systems Integrators located throughout the United States alone, plus Rockwell Automation representatives in every major country in the world.

Local Product Support

Contact your local Rockwell Automation representative for:
sales and order support
product technical training
warranty support
support service agreements

Technical Product Assistance

If you need to contact Rockwell Automation for technical assistance, please review the information in the Module Diagnostics and Troubleshooting chapter first. Then call your local Rockwell Automation representative.

Your Questions or Comments on this Manual

If you have any suggestions for how this manual could be made more useful to you, please contact us at the address below:
Rockwell Automation Control and Information Group Technical Communication, Dept. A602V P.O. Box 2086 Milwaukee, WI 53201-2086
Publication 1746-UM003A-EN-P
Preface 4
Publication 1746-UM003A-EN-P
Overview
Chapter
1

Description

This chapter describes the 8-channel 1746-NR8 RTD/Resistance Input Module
Module and explains how the SLC controller gathers RTD (Resistance
Module Module Temperature Detector) temperature or resistance-initiated analog input from the module. Included is:
a general description of the module’s hardware and software features
an overview of system operation
For the rest of the manual, the 1746-NR8 RTD/Resistance Input Module referred to as simply the RTD module
The RTD module receives and stores digitally converted analog data from RTDs or other resistance inputs such as potentiometers into its image table for retrieval by all fixed and modular SLC 500 processors. An RTD consists of a temperature-sensing element connected by 2, 3, or 4 wires that provide input to the RTD module. The module supports connections from any combination of up to eight RTDs of various types (for example: platinum, nickel, copper, or nickel-iron) or other resistance inputs.
The RTD module supplies a small current to each RTD connected to the module inputs (up to 8 input channels). The module provides on-board scaling and converts RTD input to temperature ( input in ohms.
RTD module.
RTD moduleRTD module
1746-NR8 RTD/Resistance Input
1746-NR8 RTD/Resistance Input 1746-NR8 RTD/Resistance Input
1746-NR8 RTD/Resistance Input Module is
1746-NR8 RTD/Resistance Input Module1746-NR8 RTD/Resistance Input Module
°C°F
or reports resistance
Each input channel is individually configurable for a specific input device. Broken sensor detection (open- or short-circuit) is provided for each input channel. In addition, the module provides indication if the input signal is out-of-range. For more detail on module functionality, refer to the subsection entitled System Overview
1 Publication 1746-UM003A-EN-P
System Overview later in this chapter.
System OverviewSystem Overview
1-2 Overview
Figure 1.1 Simplified RTD Module Circuit
Constant Current Source
Ic=0.25 or
1.0 mA
RTD
Sense
RTD Module
Backplane
RTD 0
RTD 1
RTD 2
RTD 3
RTD 4
Return
RTD
Sense
Return
RTD Sense
Return
RTD
Sense
Return
RTD
Sense
Return
A/D
Conversion
Digital Data
Digital
µP Circuit
Digital Data
Publication 1746-UM003A-EN-P
RTD 5
RTD 6
RTD 7
RTD
Sense
Return
RTD
Sense
Return
RTD
Sense
Return
Overview 1-3

RTD Compatibility

The following table lists the RTD types used with the RTD module and gives each type’s associated temperature range, resolution, and repeatability specifications. The next table shows the accuracy and temperature drift specifications for the RTDs.
Table 1.1 RTD Temperature Ranges, Resolution, and Repeatability
Input Type Temp. Range
(0.25 mA Excitation)
Platinum (385)
(2)
100 -200°C to +850°C
(-328°F to +1562°F)
200 -200°C to +850°C
(-328°F to +1562°F)
-200°C to +850°C
500
(-328°F to +1562°F)
-200°C to +850°C
1000
(-328°F to +1562°F)
Platinum (3916)
(2)
100 -200°C to +630°C
(-328°F to +1166°F)
-200°C to +630°C
200
(-328°F to +1166°F)
-200°C to +630°C
500
(-328°F to +1166°F)
1000 -200°C to +630°C
(-328°F to +1166°F)
Copper (426)
(2) (3)
10 -100°C to +260°C
(-328°F to +500°F)
Nickel (618)
(2) (4)
120 -100°C to +260°C
(-328°F to +500°F)
Nickel (672)
(2)
120 -80°C to +260°C
(-328°F to +500°F)
Nickel Iron (518)
(2)
604 -200°C to +200°C
(-328°F to +392°F)
(1) The temperature range for the 1000Ω, 500Ω, and 604RTD is dependent on the excitation current. (2) The digits following the RTD type represent the tem perature coefficient of resistance (α), which is defined as the resistance change per ohm per  C. For instance, Platinum
385 refers to a platinum RTD with α = 0.00385 ohms/ohm · C or simply 0.00385 / C. (3) Actual value at 0C is 9.042per SAMA standard RC21-4-1966. (4) Actual value at 0C is 100per DIN standard.
Temp. Range
(1)
(1.0 mA Excitation)
-200°C to +850°C (-328°F to +1562°F)
-200°C to +850°C (-328°F to +1562°F)
-200°C to +390°C (-328°F to +698°F)
-200°C to +50°C (-328°F to +122°F)
-200°C to +630°C (-328°F to +1166°F)
-200°C to +630°C (-328°F to +1166°F)
-200°C to +380°C (-328°F to +698°F)
-200°C to +50°C (-328°F to +122°F)
-100°C to +260°C (-328°F to +500°F)
-100°C to +260°C (-328°F to +500°F)
-80°C to +260°C (-328°F to +500°F)
-200°C to +180°C (-328°F to +338°F)
(1)
0.1°C (0.1°F)
0.1°C (0.1°F)
0.1°C (0.1°F)
0.1°C (0.1°F)
0.1°C (0.1°F)
0.1°C (0.1°F)
0.1°C (0.1°F)
0.1°C (0.1°F)
0.1°C (0.1°F)
0.1°C (0.1°F)
0.1°C (0.1°F)
0.1°C (0.1°F)
(28 Hz, 50/60 Hz)
± 0.2°C (± 0.4°F)
± 0.2°C (± 0.4°F)
± 0.2°C (± 0.4°F)
± 0.2°C (± 0.4°F)
± 0.2°C (± 0.4°F)
± 0.2°C (± 0.4°F)
± 0.2°C (± 0.4°F)
± 0.2°C (± 0.4°F)
± 0.2°C (± 0.4°F)
± 0.1°C (± 0.2°F)
± 0.1°C (± 0.2°F)
± 0.1°C (± 0.2°F)
Resolution Repeatability
IMPORTANT
The exact signal range valid for each input type is dependent upon the excitation current magnitude that you select when configuring the module. For details on excitation current, refer to Appendix A.
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1-4 Overview
Table 1.2 RTD Accuracy and Temperature Drift Specifications
Input Type 0.25 mA Excitation 1.0 mA Excitation
Accuracy Temperature Drift Accuracy Temperature Drift
Platinum (385)
Platinum (3916)
Copper (426)
Nickel (618)
±0.5°C
100
200
±0.6°C
500
±0.7°C
1000
±1.2°C
10
±0.4°C
200
±0.5°C
500
±0.6°C
1000
±0.9°C
10
±0.5°C
120
± 0.2°C
(±0.9°F)
(±1.1°F)
(±1.3°F)
(±2.2°F)
(±0.7°F)
(±0.9°F)
(±1.1°F)
(±1.6°F)
(±0.9°F)
(±0.4°F)
±0.012°C/°C (±0.012°F/°F)
±0.015°C/°C (± 0.015°F/°F)
±0.020°C/°C (±0.020°F/°F)
±0.035°C/°C (±0.035°F/°F)
±0.010°C/°C (± 0.010°F/°F)
±0.011°C/°C (±0.011°F/°F)
±0.015°C/°C (± 0.015°F/°F)
±0.026°C/°C (±0.026°F/°F)
±0.008°C/°C (±0.008°F/F)
±0.003°C/°C (±0.003°F/°F)
±0.7°C (±1.3°F)
±0.7°C (±1.3°F)
±0.5°C (± 0.9°F)
±0.4°C (±0.7°F)
±0.6°C (±1.1°F)
±0.6°C (±1.1°F)
±0.4°C (±0.7°F)
±0.3°C (±0.6°F)
±0.8°C (±1.4°F)
±0.2°C (±0.4°F)
±0.020°C/°C (±0.020°F/°F)
±0.020°C/°C (±0.020°F/°F)
±0.012°C/°C (±0.012°F/°F)
±0.010°C/°C (±0.010°F/°F)
±0.015°C/°C (±0.015°F/°F)
±0.015°C/°C (±0.015°F/°F)
±0.012°C/°C (±0.012°F/°F)
±0.010°C/°C (±0.010°F/°F)
±0.008°C/°C (±0.008°F/°F)
±0.005°C/°C (±0.005°F/°F)
Nickel
120
(672)
Nickel Iron
604
(518)
Resistance 150
500
1000 ±1.0 ±0.025/°C
3000 ±1.5 ±0.040/°C
±0.2°C
(±0.4°F)
±0.3°C
(±0.5°F)
±0.2 ±0.004/°C
±0.5 ±0.012/°C
±0.003°C/°C (±0.003°F/°F)
±0.008°C/°C (±0.008°F/°F)
(±0.002
/°F)
(±0.007
/°F)
(±0.014
/°F)
(±0.023
/°F)
±0.2°C (±0.4°F)
±0.3°C (± 0.5°F)
±0.003/°C
±0.15
±0.005°C/°C (±0.005°F/°F)
±0.008°C/°C (±0.008°F/°F)
(± 0.002
±0.012/°C
±0.5
(±0.007
±0.025/°C
±1.0
(±0.014
±0.040/°C
±1.2
(±0.023
/°F)
/°F)
/°F)
/°F)
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Resistance Device Compatibility

The table below lists the resistance input types you can use with the RTD module and gives each type’s associated specifications.
Table 1.3 Resistance Input Specifications
Input Type Resistance Range
(0.25 mA Excitation)
Resistance 150
(1) The accuracy values assume that the module was calibrated within the specified temperature range of 0°C to 60°C (32°F to 140°F). (2) The accuracy for 150
(3) The temperature drift for 150
0to 150 0 to 150
500 0to 500 0 to 500 0.5 ± 0.012/°C
1000 0to 1000 0Ω to 1000Ω  1.0  0.025Ω/ C
3000 0to 3000 0Ω to 1200Ω
is dependent on the excitation current: 0.2 Ω at 0.25 mA and 0.15Ω at 1.0 mA
is dependent on the excitation current: 0.006Ω/°C at 0.25 mA and 0.004Ω at 1.0 mA
Resistance Range (1.0 mA Excitation)
Accuracy
(2)
1.5
(1)
Temperature Drift
±0.004/°C
(±0.002
(± 0.007
(
0.014/F)
(
0.023/F)
/°F)
/°F)
0.040/C
(3)
Overview 1-5
Resolution Repeatability
0.01 0.04
0.2
0.1
0.2
0.1
0.2
0.1

Hardware Overview

The RTD module occupies one slot in an SLC 500:
modular system, except the processor slot (0)
fixed system expansion chassis (1746-A2)
The module uses eight input words and eight output words for Class 1 and 16 input words and 24 output words for Class 3.
IMPORTANT
As shown in the illustration below and table that follows, the module contains a removable terminal block (item 3) providing connection for any mix of eight RTD sensors or resistance input devices. There are no output channels on the module. Module configuration is done via the user program. There are no DIP switches.
If the RTD module resides in a remote configuration with a SLC 500 Remote I/O Adapter Module (1747-ASB), use block transfer for configuration and data retrieval. Block transfer requires a 1747-SN Remote I/O Scanner (Series B)
or PLC
®
processor.
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1-6 Overview
1
2
3
INPUT
CHANNEL ST ATUS
MODULE
RTD / resistance
0 4 1 2 3
5 6 7
Figure 1.2 RTD Module Hardware
5
RTD 0 Sense 0 Return 0 RTD 1 Sense 1 Return 1 RTD 2 Sense 2 Return 2 RTD 3 Sense 3 Return 3 RTD 4 Sense 4 Return 4 RTD 5 Sense 5 Return 5 RTD 6 Sense 6 Return 6 RTD 7 Sense 7 Return 7
1746-NR8
6
WIN (21) 1G0AA2ZT
1746-NR8 A 1.00
(21) 1G0AA2ZT
SLC 500
RTD / resistance INPUT MODULE
FRNSERCAT
U
®
L
CL I, DIV2 GP ABCD
IND CONT EQ.
FOR HAZ LOC
LISTED
1P00
55mA @ 24VDC, 100mA @ 5VDC
BACKPLANE REQUIREMENTS:
MADE IN U.S.A
C
U
®
L
SC P/N: 9060018-01
SC S/N: 167076
SC MFD: 0020
RESISTANCE (OHMS):
150, 500, 1000, 3000
NICKEL, NICKEL - IRON
RTD TYPES:
PLATINUM, COPPER
INPUT SIGNAL RANGES
150
4
7
Table 1.4 Hardware Features
Item Description Function
1 Channel Status LED
Indicators (green)
Displays operating and fault status of
channels 0, 1, 2, 3, 4, 5, 6, and 7 2 Module Status LED (green) Displays module operating and fault status 3 Removable Terminal Block Provides physical connection to input devices
(Catalog # 1746-RT35) 4 Cable Tie Slots Secures wiring from module 5 Door Label Provides terminal identification 6 Side Label (Nameplate) Provides module information 7 Self-Locking Tabs Secures module in chassis slot

General Diagnostic Features

The RTD module contains diagnostic features that can be used to help you identify the source of problems that may occur during power up or during normal channel operation. These power-up and channel diagnostics are explained in Chapter 6, Module Diagnostics and Troubleshooting.
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The RTD module communicates to the SLC 500 processor through the parallel backplane interface and receives +5V dc and +24V dc power from the SLC 500 power supply through the backplane. No external power supply is required. You may install as many RTD modules in your system as the power supply can support, as shown in the illustration below.
Overview 1-7

System Overview

Figure 1.3 RTD Configuration
RTD Modules
SLC Processor
Each individual channel on the RTD module can receive input signals from 2, 3 or 4-wire RTD sensors or from resistance input devices. You configure each channel to accept either input. When configured for RTD input types, the module converts the RTD readings into linearized, digital temperature readings in °C or °F. When configured for resistance inputs, the module provides a linear resistance value in ohms.
IMPORTANT
The RTD module is designed to accept input from RTD sensors with up to 3 wires. When using 4-wire RTD sensors, one of the 2 lead compensation wires is not used and the 4-wire sensor is treated like a 3-wire sensor. Lead wire compensation is provided via the third wire. Refer to Wiring Considerations on page 2-8 for more information.

System Operation

The RTD module has 3 operational states:
power-up
module operation
error (module error and channel error)
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1-8 Overview
Power-up
At power-up, the RTD module checks its internal circuits, memory, and basic functions via hardware and software diagnostics. During this time, the module status LED remains off, and the channel status LEDs are turned on. If no faults are found during the power-up diagnostics, the module status LED is turned on, and the channel status LEDs are turned off.
After power-up checks are complete, the RTD module waits for valid channel configuration data from your SLC ladder logic program (channel status LEDs off). After configuration data is written to one or more channel configuration words and their channel enable bits are set by the user program, the channel status LEDs go on and the module continuously converts the RTD or resistance input to a value within the range you selected for the enabled channels. The module is now operating in its normal state.
Each time a channel is read by the module, that data value is tested by the module for a fault condition, for example, open-circuit, short-circuit, over­range, and under range. If such a condition is detected, a unique bit is set in the channel status word and the channel status LED flashes, indicating a channel error condition.
The SLC processor reads the converted RTD or resistance data from the module at the end of the program scan or when commanded by the ladder program. The processor and RTD module determine that the backplane data transfer was made without error and the data is used in your ladder program.
Module Operation
Each input channel consists of an RTD connection, which provides:
excitation current
a sense connection, which detects lead-wire resistance
a return connection, which reads the RTD or resistance value
Each of these analog inputs are multiplexed to an analog converter.
The A/D converter cycles between reading the RTD or resistance value, the lead wire resistance, and the excitation current. From these readings, an accurate temperature or resistance is returned to the user program.
The RTD module is isolated from the chassis backplane and chassis ground. The isolation is limited to 500V ac. Optocouplers are used to communicate across the isolation barrier. Channel-to-channel common-mode isolation is limited to ± 5 volts.
LED Status
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The illustration below shows the RTD module LED panel consisting of nine LEDs. The state of the LEDs (for example, off, on, or flashing) depends on the operational state of the module (see table on page 1-9).
Overview 1-9
Figure 1.4 LED Indicators
INPUT
RTD Module
CHANNEL ST ATUS
MODULE
RTD / resistance
0 4 1 2 3
5 6 7
The purpose of the LEDs is as follows:
Channel Status - One LED for each of the 8 input channels indicates if the
channel is enabled, disabled, or is not operating as configured, due to an error.
Module Status - If OFF or flashing at any time, other than at powerup, this
LED indicates that non-recoverable module errors (for example, diagnostic or operating errors) have occurred. The LED is ON if there are no module errors.
The status of each LED, during each of the operational states (for example, powerup, module operation and error), is depicted in the following table.
LED
Power-up
Ch 0 to 7 Status On On/Off
Mod. Status Off On Flashes/Off On
(1) Module is disabled during powerup. (2) Channel status LED is On if the respective channel is enabled and Off if the channel is disabled. (3) Error if channel is enabled.
(1)
Module Operation (No Error)
(2)
(3)
Off
Error
Flashes
Module Error Channel
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1-10 Overview

Module to Processor Communication

As shown in the following illustration, the RTD module communicates with the SLC processor through the backplane of the chassis. The RTD module transfers data to/receives data from the processor by means of an image table. The image table consists of eight input words and eight output words when configured for Class 1 operation; 16 input words and 24 output words when configured for Class 3 operation. Data transmitted from the module to the processor is called the input image (for example, Channel Data Words and Channel Status Words). Conversely, data transmitted from the processor to the module is called the output image (for example, Channel Configuration Words and Scaling Limit Words). Details about the input and output images are found in “Module Addressing” on page 3-2.
Figure 1.5 Communication Flow
Channel Data Words
RTD/Resistance Analog Signals
1746-NR8
Input
Module
Channel Status Words
Scaling Limit Words
SLC 500
Processor
Channel Configuration Words
Chassis Backplane
The Channel Configuration Words (output image) contain user-defined configuration information for the specified input channel. This information is used by the module to configure and operate each channel. The Channel Status Words (input image) contain status information about the channel’s current configuration and operational state. The input data values of the analog input channel are contained in the Channel Data Word (input image), which is valid only when the channel is enabled and there are no channel errors (for example, broken sensor or overrange.)
The user-set Scaling Limit Words (output image) provide a user-definable scaling range for the temperature resistance data when using the proportional counts data type.
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Chapter
2
Installation and Wiring
This chapter tells you how to:
comply to European union directives
avoid electrostatic damage
determine the RTD module’s chassis power requirement
choose a location for the RTD module in the SLC chassis
install the RTD module
wire the RTD module’s terminal block
This product is approved for installation within the European Union and EEA regions. It has been designed and tested to meet the following directives.

Compliance to Europe Union Directives

EMC Directive

This product 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:
EN 50081-2
EMC - Generic Emission Standard, Part 2 - Industrial Environment
EN 50082-2
EMC - Generic Immunity Standard, Part 2 - Industrial Environment
This product is intended for use in an industrial environment.
1 Publication 1746-UM003A-EN-P
2-2 Installation and Wiring

Safety Considerations

Electrostatic Damage

Electrostatic discharge can damage semiconductor devices inside this module if you touch backplane connector pins or other sensitive areas. Guard against electrostatic damage by observing the precautions listed next.
ATTENTION
!!!!
Electrostatic discharge can degrade performance or cause permanent damage. Handle the module as stated below.
Wear an approved wrist strap grounding device when
handling the module.
Touch a grounded object to rid yourself of electrostatic
charge before handling the module.
Handle the module from the front, away from the
backplane connector. Do not touch backplane connector pins.
Keep the module in its static-shield bag when not in use, or
during shipment.

Hazardous Location Considerations

         ! "  #  $%!&''      
EXPLOSION HAZARD
Substitution of components may impair suitability for
Class I, Division 2.
Do not replace components or disconnect equipment
unless power has been switched off.
Do not connect or disconnect components unless power
has been switched off.
All wiring must comply with N.E.C. article 501-4(b).
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Installation and Wiring 2-3

Power Requirements

The RTD module receives its power through the SLC500 chassis backplane from the fixed or modular +5V dc/+24V dc chassis power supply. The maximum current drawn by the module is shown in the table below.
5V dc 24V dc
0.100A 0.055A
When you are using a modular system configuration, add the values shown in the table above to the requirements of all other modules in the SLC chassis to prevent overloading the chassis power supply.
When you are using a fixed system controller, refer to the Important note about module compatibility in a 2-slot expansion chassis on page 2-4.
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2-4 Installation and Wiring

Module Location in Chassis

Fixed Controller Compatibility Table
NR8 5V dc 24V dc
IA4 • 0.035 ­IA8 • 0.050 ­IA16 • 0.085 ­IM4 • 0.035 ­IM8 • 0.050 ­IM16 • 0.085 ­OA8 0.185 ­OA16 0.370 ­OAP12 0.370 ­IB8 0.050 ­IB16 0.085 ­IB32 0.050 ­ITB16 0.085 ­IV8 0.050 ­IV16 0.085 ­IV32 0.085 ­ITV16 0.085 ­IC16 0.085 ­IG16 • 0.140 ­IH16 • 0.085 ­OB8 • 0.135 ­OB16 • 0.280 ­OB32 Series D or later • 0.190 ­OB16E • 0.135 ­OBP8 • 0.135 ­OBP16 • 0.250 ­OG16 • 0.180 ­OVP16 • 0.250 ­OV8 • 0.135 ­OV16 0.270 ­OV32 Series D or later • 0.190 ­IN16 • 0.085 ­OW4 0.045 0.045 OW8 0.085 0.090 OW16 0.170 0.180 OX8 • 0.085 0.090 IO4 • 0.030 0.025 IO8 • 0.060 0.045 IO12 0.090 0.070 NI4 • 0.025 0.085 NI8 0.200 0.100 NI16I 0.125 0.075 NI16V • 0.125 0.075 NIO4I 0.055 0.145 NIO4V 0.055 0.115 FIO4I 0.055 0.150 FIO4V • 0.055 0.120 NO4I 0.055 0.195 NO4V 0.055 0.195 NT4 • 0.060 0.040 NT8 • 0.120 0.070 INT4 • 0.110 0.085 NR4 0.050 0.050 HSCE • 0.320 ­HSCE2 • 0.250 ­BAS 0.150 0.040 BASn • 0.150 0.125 KE • 0.150 0.040 KEn 0.150 0.145 HS • 0.300 ­HSTP1 • 0.200 -

Modular Chassis Considerations

Place your RTD module in any slot of an SLC 500 modular chassis (except slot
0) or a modular expansion chassis. Slot 0 is reserved for the modular processor or adapter modules.

Fixed Expansion Chassis Considerations

IMPORTANT
IMPORTANT
The 2-slot, SLC 500 fixed I/O expansion chassis (1746-A2) supports only specific combinations of modules. If you are using the RTD module in a 2-slot expansion chassis with another SLC I/O or communication module, refer to the table at the left to determine whether the combination can be supported.
When using the table, be aware that there are certain conditions that affect the compatibility characteristics of the BASIC module (BAS) and the DH-485/RS-232C module (KE). When you use the BAS module or the KE module to supply power to a 1747-AIC Link Coupler, the link coupler draws its power through the module. The higher current drawn by the AIC at 24V dc is calculated and recorded in the table for the modules identified as BASn (BAS networked) or KEn (KE networked). Make sure to refer to these modules if your application uses the BAS or KE module in this way.
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Installation and Wiring 2-5

General Considerations

Most applications require installation in an industrial enclosure to reduce the effects of electrical interference. RTD inputs are susceptible to electrical noises due to the small amplitudes of their signal.
Group your modules to minimize adverse effects from radiated electrical noise and heat. Consider the following conditions when selecting a slot for the RTD module. Position the module in a slot:
away from power lines, load lines and other 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
32-point I/O modules

Module Installation and Removal

When installing the module in a chassis, it is not necessary to remove the terminal block from the module. However, if the terminal block is removed, use the write-on label located on the side of the terminal block, as shown below, to identify the module location and type.
SLOT
____
MODULE
RACK
____
_______________
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2-6 Installation and Wiring

Removing the Terminal Block

ATTENTION
Never install, remove, or wire modules with power applied to the chassis or devices wired to the module. To avoid cracking the removable terminal block, alternate the removal of the slotted terminal block release screws.
!!!!
1.
1. Loosen the two terminal block release screws.
1.1.
Ter m inal B l ock Release Screw (Requires a 0.100 in slot screwdriver.)
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Maximum Torque = 0.25 Nm (2.25 in-lbs)
2.
2. Grasp the terminal block at the top and bottom and pull outward and
2.2. down.
Installation and Wiring 2-7

Installing the Module

1.
1. Align the circuit board of the RTD module with the card guides located at
1.1. the top and bottom of the chassis, as shown in the following illustration.
Top and Bottom Module Releases
Card Guide
2.
2. Slide the module into the chassis until both top and bottom retaining clips
2.2. are secured. Apply firm even pressure on the module to attach it to its backplane connector. Never force the module into the slot.
3.
3. Cover all unused slots with the Card Slot Filler, Catalog Number 1746-N2.
3.3.

Removing the Module

1.
1. Press the releases at the top and bottom of the module and slide the module
1.1. out of the chassis slot.
2.
2. Cover all unused slots with the Card Slot Filler, Catalog Number 1746-N2.
2.2.
The RTD module contains an 24-position, removable terminal block. The terminal pin-out is shown in the illustration on page 2-8.
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2-8 Installation and Wiring

Terminal Wiring

ATTENTION
Disconnect power to the SLC before attempting to install, remove, or wire the removable terminal wiring block. To avoid cracking the removable terminal block, alternate the removal of the terminal block release screws.
!!!!
Figure 2.1 Terminal Block
(Terminal Block Spare Part Number 1746-RT35)
RTD 0 Sense 0 Return 0 RTD 1 Sense 1 Return 1 RTD 2 Sense 2 Return 2 RTD 3 Sense 3 Return 3 RTD 4 Sense 4 Return 4 RTD 5 Sense 5 Return 5 RTD 6 Sense 6 Return 6 RTD 7 Sense 7 Return 7
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Release Screw Maximum Torque = 0.25 Nm (2.25 lbs-in)

Wiring Considerations

Follow the guidelines below when planning your system wiring.
Since the operating principle of the RTD module is based on the measurement of resistance, take special care in selecting your input cable. For 2-wire or 3-wire configuration, select a cable that has a consistent impedance throughout its entire length.
Configuration Recommended Cable
2-wire Belden™ #9501 or equivalent 3-wire
less than 30.48m (100 ft.) 3-wire
greater than 30.48 m (100 ft.) or high humidity conditions
Belden #9533 or equivalent
Belden #83503 or equivalent
Installation and Wiring 2-9
For a 3-wire configuration, the module can compensate for a maximum cable length associated with an overall cable impedance of 25 ohms.
IMPORTANT
Details of cable specifications are shown on page A-5.
Three configurations of RTDs can be connected to the RTD module, namely:
2-wire RTD, which is composed of 2 RTD lead wires (RTD and Return)
3-wire RTD, which is composed of a Sense and 2 RTD lead wires (RTD and
Return)
4-wire RTD, which is composed of 2 Sense and 2 RTD lead wires (RTD
and Return). The second sense wire of a 4-wire RTD is left open. It does not matter which sense wire is left open.
IMPORTANT
The RTD module requires three wires to compensate for lead resistance error. We recommend that you do not use 2-wire RTDs if long cable runs are required, as it reduces the accuracy of the system. However, if a 2-wire configuration is required, reduce the effect of the lead wire resistance by using a lower gauge wire for the cable (for example, use AWG #16 instead of AWG #24). Also, use cable that has a lower resistance per foot of wire. The module’s terminal block accepts one AWG #14 gauge wire.
(  $ $ )
To limit overall cable impedance, keep input cables as short as possible. Locate your I/O chassis as near the RTD sensors as your application permits.
Ground the shield drain wire at one end only. The preferred location is at
the chassis mounting tab of the rack, under the RTD module. Refer to IEEE Std. 518, Section 6.4.2.7 or contact your sensor manufacturer for additional details.
Route RTD/resistance input wiring away from any high-voltage I/O wiring,
power lines, and load lines.
Tighten terminal screws using a flat-head screwdriver. Each screw should be
turned tight enough to immobilize the wire’s end. Excessive tightening can strip the terminal screw. The torque applied to each screw should not exceed
0.25 Nm (2.25 in-lbs) for each terminal.
Follow system grounding and wiring guidelines found in your SLC 500
Installation and Operation Manual, publication 1747-6.2.
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2-10 Installation and Wiring
Figure 2.2 RTD Connections to Terminal Block
2-Wire Interconnection
RTD
Return
Belden #9501 Shielded Cable
3-Wire Interconnection
RTD
Sense
Return
Belden #9533 Shielded Cable or Belden #83503 Shielded Cable
4-Wire Interconnection
RTD
Sense
Return
Leave One Sensor Wire Open
Belden #9533 Shielded Cable or Belden #83503 Shielded Cable
Cable Shield (Frame Ground)
Cable Shield (Frame Ground)
Cable Shield (Frame Ground)
Add jumper
RTD 0 Sense 0 Return 0 RTD 1 Sense 1 Return 1 RTD 2 Sense 2 Return2
RTD 0 Sense 0 Return 0 RTD 1 Sense 1 Return 1 RTD 2 Sense 2 Return2
RTD 0 Sense 0 Return 0 RTD 1 Sense 1 Return 1 RTD 2 Sense 2 Return2
RTD 0 Sense 0 Return 0 RTD 1 Sense 1 Return 1 RTD 2 Sense 2 Return2 RTD 3 Sense 3 Return 3 RTD 4 Sense 4 Return 4 RTD 5 Sense 5 Return 5 RTD 6 Sense 6 Return 6 RTD 7 Sense 7 Return 7
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When using a 3-wire configuration, the module compensates for resistance error due to lead wire length. For example, in a 3-wire configuration, the module reads the resistance due to the length of one of the wires and assumes that the resistance of the other wire is equal. If the resistances of the individual lead wires are much different, an error may exist. The closer the resistance values are to each other, the greater the amount of error that is eliminated.
Installation and Wiring 2-11
IMPORTANT
To ensure temperature or resistance value accuracy, the resistance difference of the cable lead wires must be equal to or less than 0.01
Ω..
There are several ways to insure that the lead values match as closely as possible. They are as follows:
Keep lead resistance as small as possible and less than 25Ω.
Use quality cable that has a small tolerance impedance rating.
Use a heavy-gauge lead wire which has less resistance per foot.

Wiring Resistance Devices (Potentiometers) to the Module

Potentiometer wiring requires the same type of cable as that for the RTD described in the previous subsection. Potentiometers can be connected to the RTD module as a 2-wire connection or a 3-wire connection.
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2-12 Installation and Wiring
Figure 2.3 2-Wire Potentiometer Connections to Terminal Block
For details on wiring a potentiometer to the module, see page 2-8.
RTD 0 Sense 0 Return 0 RTD 1 Sense 1 Return 1 RTD 2 Sense 2 Return 2 RTD 3 Sense 3 Return 3 RTD 4 Sense 4 Return 4 RTD 5 Sense 5 Return 5 RTD 6 Sense 6 Return 6 RTD 7 Sense 7 Return 7
Potentiometer
Belden #9501 Shielded Cable
Cable Shield (Frame Ground)
Add Jumper
Potentiometer
Belden #9501 Shielded Cable
Potentiometer wiper arm can be connected to either the RTD or return terminal depending on whether the user wants increasing or decreasing resistance.
RTD 0 Sense 0 Return 0 RTD 1 Sense 1
Cable Shield (Frame Ground)
Add Jumper
Return 1 RTD 2 Sense 2 Return 2 RTD 3 Sense 3 Return 3 RTD 4 Sense 4 Return 4 RTD 5 Sense 5 Return 5 RTD 6 Sense 6 Return 6 RTD 7 Sense 7 Return 7
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Figure 2.4 3-Wire Potentiometer Connections to Terminal Block
For details on wiring a potentiometer to the module, see page 2-8.
Run RTD and sense wires from module to potentiometer and tie them to one point.
Installation and Wiring 2-13
Potentiometer
Belden #83503 or #9533 Shielded Cable
Potentiometer wiper arm can be connected to either the RTD or return terminal depending on whether the user wants increasing or decreasing resistance.
Run RTD and sense wires from module to potentiometer and tie them to one point.
Potentiometer
Belden #83503 or #9533 Shielded Cable
Cable Shield (Frame Ground)
Cable Shield (Frame Ground)
RTD 0 Sense 0 Return RTD 1 Sense 1 Return 1 RTD 2 Sense 2 Return 2
RTD 0 Sense 0 Return RTD 1 Sense 1 Return 1 RTD 2 Sense 2 Return 2
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2-14 Installation and Wiring

Wiring Input Devices to the Module

To wire your 1746-NR8 module, follow these steps as shown in the illustration below:
1.
1. At each end of the cable, strip some casing to expose the individual wires.
1.1.
2.
2. Trim the signal wires to 5.08-cm (2-inch) lengths. Strip about 4.76 mm (3/
2.2. 16 inch) of insulation away to expose the end of the wire.
3.
3. At one end of the cable twist the drain wire and foil shield together, bend
3.3. them away from the cable, and apply shrink wrap. Then earth ground at the frame ground of the rack.
4.
4. At the other end of the cable, cut the drain wire and foil shield back to the
4.4. cable and apply shrink wrap.
5.
5. Connect the signal wires to the 1746-NR8 terminal block and the input.
5.5.
6.
6. Repeat steps 1 through 5 for each channel on the 1746-NR8 module.
6.6.
Figure 2.5 Shielded Cable
2-Conductor Shielded Cable
(See step 4.)
Signal Wire
Signal Wire
Signal Wire
Signal Wire
Signal Wire
Drain Wire
Drain Wire
(See step 3.)
Foil Shield
3-Conductor Shielded Cable
Foil Shield
Signal Wire
Signal Wire
Signal Wire
Signal Wire
Signal Wire
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Installation and Wiring 2-15

Calibration

The accuracy of a system that uses the RTD module is determined by the following:
the accuracy of the RTD
resistance mismatch of the cable wires that connect the RTD to the module
the accuracy of the RTD module
For optimal performance at the customer site, the RTD module is calibrated at the factory prior to shipment. In addition, an autocalibration feature further ensures that the module performs to specification over the life of the product.

Factory Calibration

The 2-pin calibration connector, on the RTD module circuit board, is used for factory setup only.

Autocalibration

When a channel becomes enabled, the module configures the channel and performs an autocalibration on the module if the combination of input type and excitation current are unique to that channel. Autocalibration performs A/D conversions on the zero voltage and the full-scale voltage of the A/D converter.
IMPORTANT
These conversions generate offset (zero reference) and full scale (span reference) coefficients that are saved and used by the module to perform future A/D conversions.
You can command your module to perform an autocalibration cycle once every 5 minutes by setting any channel’s calibration disable bit to 0. To disable autocalibration, all channel’s calibration disable bits must be set to 1. You can control the module’s autocalibration time by disabling autocalibration, and then setting any channel’s calibration disable bit to 0, waiting at least one module scan time and then resetting that channel’s calibration disable bit to 1. Several scan cycles are required to perform an autocalibration (see page 3-10). It is important to remember that during autocalibration the module is not converting input data.
Channel calibration time is shown in “Channel Autocalibration” on page 3-10.
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2-16 Installation and Wiring
TIP
To maintain system accuracy we recommend that you periodically perform an autocalibration cycle, for example:
whenever an event occurs that greatly changes the internal
temperature of the control cabinet, such as opening or closing its door
at a convenient time when the system is not making
product, such as during a shift change
An autocalibration programming example is provided on page 5-10.

Single-Point Calibration

Single-point calibration is an optional procedure that can be used to improve the accuracy of the RTD module and cable combination to greater than ±0.2°C (when the RTD is operating at ±50°C of the calibration temperature). The offset, determined by the single-point calibration, can be used to compensate for inaccuracies in the RTD module and cable combination.
After single-point calibration is performed, additional calibrations only need to be performed if the cable is disturbed or degraded. (RTD replacement should not affect the accuracy of the procedure.) However, periodic autocalibrations should be performed. Follow the steps below to perform a single-point calibration:
1.
1. Cycle power to the SLC 500 chassis.
1.1.
2.
2. Select a calibration temperature that is near the control point (±10°C).
2.2.
3.
3. Determine the exact resistance (±0.01
3.3.
) equivalent to the calibration
temperature by using a published temperature vs. resistance chart.
4.
4. Replace the RTD with the fixed-precision resistor. (We recommend you use
4.4. a 2 ppm temperature coefficient resistor.)
5.
5. Use the RTD module to determine the temperature equivalent to the fixed
5.5. precision resistor and cable combination.
6.
6. Calculate the offset value by subtracting the calculated calibration
6.6. temperature from the measured temperature.
7.
7. Reconnect the RTD to the cable.
7.7.
8.
8. Use ladder logic to apply (subtract) the offset from the measured
8.8. temperature to obtain corrected temperature.
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Chapter
Preliminary Operating Considerations
This chapter explains how the RTD module and the SLC processor communicate through the module’s input and output image. It lists the preliminary setup and operation required before the RTD module can function in a 1746 I/O system. Topics discussed include how to:
enter the module ID code
address your RTD module
select the proper input filter for each channel
calculate the RTD module update time
interpret the RTD module response to slot disabling
3

Module ID Code

The module identification code is a unique number encoded for each 1746 I/O module. The code defines for the processor the type of I/O or specialty module residing in a specific slot in the 1746 chassis.
To manually enter the module ID code, select (other) from the list of modules on the system I/O configuration display. The module ID code for the RTD module is shown below:
Operating Class ID Code
Class 1 3508
Class 3 12708
No special I/O configuration information is required for Class 1. The module ID code automatically assigns the correct number of input and output words. For Class 3 the user must assign the correct number of input and output words (16 and 24).
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3-2 Preliminary Operating Considerations

Module Addressing

SLC 5/0X Data Files
Slot e
Output Image
Slot e
Input Image
The memory map shown in the following illustration displays how the output and input image tables are defined for the RTD module.
Figure 3.1 Class 1 Memory Map
Bit 0
Word 0 Word 1 Word 2 Word 3 Word 4 Word 5 Word 6 Word 7
Word 0 Word 1 Word 2 Word 3 Word 4 Word 5 Word 6 Word 7
Bit 0
Output
Scan
Input
Scan
Analog Input
Module
Image Table
Output Image
8 Words
Input Image
8 Words
Output Image
Input Image
Bit 15
Channel 0 Configuration Word
Channel 1 Configuration Word Channel 2 Configuration Word Channel 3 Configuration Word
Channel 4 Configuration Word Channel 5 Configuration Word
Channel 6 Configuration Word Channel 7 Configuration Word
Channel 0 Data Word Channel 1 Data Word Channel 2 Data Word Channel 3 Data Word Channel 4 Data Word Channel 5 Data Word Channel 6 Data Word Channel 7 Data Word
Bit 15
Address
O:e.0 O:e.1 O:e.2 O:e.3 O:e.4 O:e.5 O:e.6 O:e.7
Address
I:e.0 I:e.1 I:e.2 I:e.3 I:e.4 I:e.5 I:e.6 I:e.7
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Figure 3.2 Class 3 Memory Map
Preliminary Operating Considerations 3-3
SLC 5/0X Data Files
Slot e
Output Image
Slot e
Input Image
Output
Scan
Input Scan
Analog Input
Module
Image Table
Output Image
24 Words
Input Image
16 Words
Output Image
Input Image
Bit 15
Channel 0 Configuration Word Channel 1 Configuration Word
Channel 2 Configuration Word Channel 3 Configuration Word Channel 4 Configuration Word Channel 5 Configuration Word Channel 6 Configuration Word
Channel 7 Configuration Word lower scale limit range 0 upper scale limit range 0
lower scale limit range 1 upper scale limit range 1
lower scale limit range 2 upper scale limit range 2 lower scale limit range 3
upper scale limit range 3 lower scale limit range 4 upper scale limit range 4 lower scale limit range 5 upper scale limit range 5 lower scale limit range 6
upper scale limit range 6
lower scale limit range 7 upper scale limit range 7
Channel 0 Data Word Channel 1 Data Word
Channel 2 Data Word Channel 3 Data Word Channel 4 Data Word Channel 5 Data Word Channel 6 Data Word Channel 7 Data Word Channel 0 Status Word Channel 1 Status Word Channel 2 Status Word
Channel 3 Status Word Channel 4 Status Word Channel 5 Status Word
Channel 6 Status Word Channel 7 Status Word
Bit 15 Bit 0
Bit 0
Word 0 Word 1 Word 2 Word 3 Word 4 Word 5 Word 6 Word 7 Word 8 Word 9 Word 10 Word 11 Word 12 Word 13 Word 14 Word 15 Word 16 Word 17 Word 18 Word 19 Word 20 Word 21 Word 22 Word 23
Word 0 Word 1 Word 2 Word 3 Word 4 Word 5 Word 6 Word 7 Word 8 Word 9 Word 10 Word 11 Word 12 Word 13 Word 14 Word 15
Address
O:e.0 O:e.1 O:e.2 O:e.3 O:e.4 O:e.5 O:e.6 O:e.7 O:e.8 O:e.9 O:e.10 O:e.11 O:e.12 O:e.13 O:e.14 O:e.15 O:e.16 O:e.17 O:e.18 O:e.19 O:e.20 O:e.21 O:e.22 O:e.23
Address
I:e.0 I:e.1 I:e.2 I:e.3 I:e.4 I:e.5 I:e.6 I:e.7 I:e.8 I:e.9 I:e.10 I:e.11 I:e.12 I:e.13 I:e.14 I:e.15
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3-4 Preliminary Operating Considerations

Output Image - Configuration Words

The RTD module output image (defined as the output from the CPU to the RTD module) contains information that you configure to define the way a specific channel on the RTD module works. The 1746-NR8 uses an 8-word output image when operating in a Class 1 mode and 24-word output image when operating in Class 3 mode. These words take the place of configuration DIP switches on the module. Output words 0 through 7 are used to define the operation of the module; output words 8 through 23 are used for special user-set scaling using the proportional counts data format. Each output word 0 through 7 configures a single channel.
Example - If you want to configure channel 2 on the RTD module located in slot 4 in the SLC chassis, your address would be O:4.2.
File Type
Element Delimiter
O : 4 . 2
Slot
Word
Word Delimiter
Chapter 4 gives you detailed bit information about the data content of the configuration word.

Input Image - Data Words and Status Words

The 8-word RTD module input image (defined as the input from the RTD module to the CPU) represents data words and status words.
Input words 0 through 7 (data words) hold the input data that represent the temperature value of the RTD input or ohmic value of the resistance inputs for channels 0 through 7. This data word is valid only when the channel is enabled and there are no channel errors.
When operating in Class 3 mode, input words 8 through 15 (status words) contain the status of channels 0 through 7 respectively. The status bits for a particular channel reflect the configuration settings that you have entered into the output image configuration word for that channel and provide information about the channel’s operational state. To receive valid status information, the channel must be enabled and the channel must have processed any configuration changes that may have been made to the configuration word.
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Preliminary Operating Considerations 3-5
Example - To obtain the status of channel 2 (input word 6) of the RTD module located in slot 3 in the SLC chassis, use address I:3.6.

Channel Filter Frequency Selection

File Type
Slot
Word
I : 3 . 6
Element Delimiter
Word Delimiter
Chapter 4 gives you detailed bit information about the content of the data word and the status word.
The RTD module uses a digital filter that provides noise rejection for the input signals. The digital filter is programmable, allowing you to select from four filter frequencies for each channel.
Selecting a low value (for example, 28 Hz) for the channel filter frequency provides greater noise rejection for a channel, but also increases the channel update time. Selecting a high value for the channel filter frequency provides lesser noise rejection, but decreases the channel update time.
The Notch Frequencies table in the next section shows the available filter frequencies, as well as the associated minimum normal mode rejection (NMR), cut-off frequency, and step response for each filter frequency. The graphs on page 3-8 and page 3-9 show the input channel frequency response for each filter frequency selection.

1746-NR8 Channel Step Response

The channel filter frequency determines the channel’s step response. The step response is the time required for the analog input signal to reach 100% of its expected final value. This means that if an input signal changes faster than the channel step response, a portion of that signal is attenuated by the channel filter. The table below shows the step response for each filter frequency.
Table 3.1 Notch Frequencies
Filter Frequency 50 Hz NMR 60 Hz NMR 3 dB Cut-Off
Frequency
28 Hz 110 dB 95 dB 7.80 Hz 120 msec 50/60 Hz 65 dB 65 dB 13.65 Hz 68.6 msec 800 Hz - - 209.8 Hz 3.75 msec 6400 Hz - - 1677 Hz 1.47 msec
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Step Response
3-6 Preliminary Operating Considerations

Effective Resolution

The effective resolution for an input channel depends upon the filter frequency selected for that channel. The following table displays the effective resolution for the various input types and filter frequencies:
Table 3.2 Effective Resolution for RTD and Resistance Inputs Input Type Filter Frequency
28 Hz 50/60 Hz 800 Hz 6400 Hz
(1)
100
Pt RTD (385)
± 0.1°C (± 0.1°F)
(1)
Pt RTD (385)
200
± 0.1°C (± 0.1°F)
(1)
Pt RTD (385)
500
± 0.1°C (± 0.1°F)
(1)
Pt RTD (385)
1000
± 0.1°C (± 0.1°F)
(1)
Pt RTD (3916)
100
± 0.1°C (± 0.1°F)
(1)
200
Pt RTD (3916)
± 0.1°C (± 0.1°F)
(1)
Pt RTD (3916)
500
± 0.1°C (± 0.1°F)
(1)
Pt RTD (3916)
1000
± 0.1°C (± 0.1°F)
(1) (2)
Cu RTD (426)
10
± 0.1°C (± 0.1°F)
(1) (3)
Ni RTD (618)
120
± 0.1°C (± 0.1°F)
(1)
Ni RTD (672)
120
± 0.1°C (± 0.1°F)
(1)
604
NiFe RTD (518)
± 0.1°C (± 0.1°F)
Resistance Input ± 0.01Ω ± 0.01Ω ± 0.02Ω ± 0.08Ω
150
500 Resistance Input ± 0.1 ± 0.1 ± 0.1 ± 0.4 1000 Resistance Input ± 0.1 ± 0.1 ± 0.2 ± 0.6 3000 Resistance Input ± 0.1 ± 0.1 ± 0.3 ± 1.0
(1) The digits following the RTD type represent the temperature coefficient of resistance (α), which is defined as
the resistance change per ohm per °C. For instance, Platinum 385 refers to a platinum RTD with α = 0.00385 ohms/ohm -°C or simply 0.00385 /°C.
± 0.1°C (± 0.1°F)
± 0.1°C (± 0.1°F)
± 0.1°C (± 0.1°F)
± 0.1°C (± 0.1°F)
± 0.1°C (± 0.1°F)
± 0.1°C (± 0.1°F)
± 0.1°C (± 0.1°F)
± 0.1°C (± 0.1°F)
± 0.1°C (± 0.2°F)
± 0.1°C (± 0.1°F)
± 0.1°C (± 0.1°F)
± 0.1°C (± 0.1°F)
± 0.2°C (± 0.4°F)
± 0.2°C (± 0.4°F)
± 0.2°C (± 0.4°F)
± 0.2°C (± 0.4°F)
± 0.2°C (± 0.4°F)
± 0.2°C (± 0.4°F)
± 0.2°C (± 0.4°F)
± 0.2°C (± 0.4°F)
± 0.4°C (± 0.7°F)
± 0.1°C (± 0.1°F)
± 0.1°C (± 0.1°F)
± 0.1°C (± 0.1°F)
± 0.8°C (± 1.4°F)
± 0.8°C (± 1.4°F)
± 0.8°C (± 1.4°F)
± 0.8°C (± 1.4°F)
± 0.8°C (± 1.4°F)
± 0.8°C (± 1.4°F)
± 0.8°C (± 1.4°F)
± 0.8°C (± 1.4°F)
± 1.0°C (± 1.8°F)
± 0.3°C (± 0.5°F)
± 0.3°C (± 0.5°F)
± 0.3°C (± 0.5°F)
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(2) Actual value at 0°C is 9.042
(3) Actual value at 0°C is 100
per SAMA standard RC21-4-1966.
per DIN standard.
Preliminary Operating Considerations 3-7

Channel Cut-Off Frequency

The channel filter frequency selection determines a channel’s cut-off frequency, also called the -3 dB frequency. The cut-off frequency is defined as the point on the input channel frequency response curve where frequency components of the input signal are passed with 3 dB of attenuation. All frequency components at or below the cut-off frequency are passed by the digital filter with less than 3 dB of attenuation. All frequency components above the cut-off frequency are increasingly attenuated, as shown in the following illustrations.
The cut-off frequency for each input channel is defined by its filter frequency selection. The table on page 3-5 shows the input channel cut-off frequency for each filter frequency. Choose a filter frequency so that your fastest changing signal is below that of the filter’s cut-off frequency. The cut-off frequency should not be confused with update time. The cut-off frequency relates 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 updated. See page 3-10 for determining the channel update time.
Figure 3.3 28 Hz Filter Frequency Response
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3-8 Preliminary Operating Considerations
Figure 3.4 50/60 Hz Filter Frequency Response
0 88 176 264 352 440 528 616 704 792 880 968 1056
Figure 3.5 800 Hz Filter Frequency Response
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0 272 538 804 1070 1336 1602 1868 2134 2400
Preliminary Operating Considerations 3-9
Figure 3.6 6400 Hz Filter Frequency Response
0 2136 4269 6402 8535 10668 12801 14934 17067 19200
This section shows how to determine the channel update time and channel autocalibration time. In addition, the scanning process is briefly described.
The RTD module channel update time is defined as the time required for the module to sample and convert (scan) the input signal of an enabled input channel and make the resulting data value available to the SLC processor for update.
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3-10 Preliminary Operating Considerations

Channel Autocalibration

Upon entry into the channel enabled state, the module configures that channel and performs an autocalibration on the module if the combination of input and excitation current are unique to that channel. Module calibration takes precedence over channel scanning. Module calibration time is dependent on the number of unique input type and excitation current combinations and is equal to 510 msec +(125 msec x number of unique combinations).

Update Time and Scanning Process

The illustration on page 3-11 shows the scanning process for the RTD module assuming that the module is running normally and more than one channel is enabled. The scanning cycle is shown for the situation where channels 0 and 1 are enabled and channels 2 through 7 are not used.
Channel scan time is a function of the filter frequency, as shown in the following table:
Table 3.3 Channel Scan Time
Filter Frequency
28 Hz 125 ms 250 ms
50/60 Hz 75 ms 147 ms
800 Hz 10 ms 18 ms
6400 Hz 6 ms 10 ms
(1) The module-scan time is obtained by summing up the channel-scan time for each enabled channel. For
example, if 3 channels are enabled with lead resistance and the 50/60 Hz filter is selected, the module-scan time is 3 x 147 ms = 441 ms.
Channel Scan Time
(1)
With Lead Resistance
The fastest module update time occurs when only one channel with a 6400 Hz filter frequency is enabled and lead resistance measurement is disabled.
Module Update Time = 6 ms
With 3 channels enabled, the module update time is: 3 channels x 6 ms/channel = 18 ms. The slowest module update time occurs when eight channels, each using a 28 Hz filter frequency and with lead resistance measurement always enabled.
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Module Update Time = 8 x 250 ms = 2000 ms
Figure 3.7 Scanning Cycle
Update Channel 1 Data Word
Calculate Channel 1 Data
Configure and Start Channel 0 A/D
Read Channel 1 A/D
Preliminary Operating Considerations 3-11
Channel 1 Channel 0
Start
Wait for Channel 0 A/D Conversion
Read Channel 0 A/D Configure and Start Channel 1 A/D
Wait for Channel 1 A/D Conversion Calculate Channel 0 Data
Update Channel 0 Data Word
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3-12 Preliminary Operating Considerations
The table below gives you the turn-on, turn-off, and reconfiguration times for enabling or disabling a channel.
Description Duration
Turn-On Time The time it takes to make converted data available in the
data word and to set the status bit (transition from 0 to
1) in the status word, after setting the enable bit in the configuration word.
Turn-Off Time The time it takes to reset the status bit (transition from 1
to 0) in the status word and to zero the data word, after resetting the enable bit in the configuration word.
Reconfiguration Time The time it takes to change a channel configuration if the
new device type and excitation current are a unique combination. The enable bit remains in a steady state of
1. (Changing temperature/resistance units or data format does not require reconfiguration time.)
By writing to the status file in your modular SLC processor you can disable any chassis slot. Refer to your SLC programming manual for the slot disable/enable procedure.
Requires up to one module update time plus 510 msec + 125 milliseconds x the number of unique input type and excitation current combinations.
Requires up to one module update time.
Requires up to one module update time plus 510 msec + 125 milliseconds x the number of unique input type and excitation current combinations.

Input Response

When an RTD slot is disabled, the RTD module continues to update its input image table. However, the SLC processor does not read inputs from a module that is disabled. Therefore, when the processor disables the RTD module slot, the module inputs appearing in the processor input image remain in their last state and the module’s updated image table is not read. When the processor re-enables the module slot, the current state of the module inputs are read by the processor during the subsequent scan.

Output Response

The SLC processor may change the RTD module output data (configuration) as it appears in the processor output image. However, this data is not transferred to the RTD module when the slot is disabled. The outputs are held in their last state. When the slot is re-enabled, the data in the processor image is transferred to the RTD module.
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Chapter
4
Channel Configuration, Data, and Status
This chapter examines the channel configuration word and the channel status word bit by bit, and explains how the module uses configuration data and generates status during operation. It gives you information about how to:
configure a channel
examine channel input data
check a channel’s status

Channel Configuration

The channel configuration word is a part of the RTD module’s output image as shown in the illustration below. Output words 0 through 7 correspond to channels 0 through 7 on the module. Setting the condition of bits 0 through 15 in these words via your ladder logic program causes the channel to operate as you choose (for example, RTD type, reading in °C). Output words 8 through 23 (Class 3 only) are used to further define the channel configuration to allow you to choose a scaling format other than the module default when using the proportional counts data format. You can use words 8 and 9 to define a user-set range for channel 0, words 10 and 11 for channel 1, etc.
A bit-by-bit examination of the configuration word is provided in the table on page 4-5. Programming is discussed in Chapter 5. Addressing is explained in Chapter 3.
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4-2 Channel Configuration, Data, and Status
Figure 4.1 Module Output Image (Configuration Word)
15 1
O:e.0
Channel 0 Configuration Word
O:e.1
O:e.2
O:e.3
O:e.4
O:e.5
O:e.6
O:e.7
O:e.8
O:e.9
O:e.10
O:e.11
O:e.12
Channel 1 Configuration Word
Channel 2 Configuration Word
Channel 3 Configuration Word
Channel 4 Configuration Word
Channel 5 Configuration Word
Channel 6 Configuration Word
Channel 7 Configuration Word
Class 3 Operation Only
Channel 0 Lower Scale Limit
Channel 0 Upper Scale Limit
Channel 1 Lower Scale Limit
Channel 1 Upper Scale Limit
Channel 2 Lower Scale Limit
O:e.13
O:e.14
O:e.15
O:e.16
O:e.17
O:e.18
O:e.19
O:e.20
O:e.21
O:e.22
O:e.23
Channel 2 Upper Scale Limit
Channel 3 Lower Scale Limit
Channel 3 Upper Scale Limit
Channel 4 Lower Scale Limit
Channel 4 Upper Scale Limit
Channel 5 Lower Scale Limit
Channel 5 Upper Scale Limit
Channel 6 Lower Scale Limit
Channel 6 Upper Scale Limit
Channel 7 Lower Scale Limit
Channel 7 Upper Scale Limit
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Channel Configuration, Data, and Status 4-3
Module default settings for configuration words 0 through 7 are all zeros. Scaling defaults are explained on page 4-9 under the explanation for the User-set Scaling Select bits 13 and 14.

Channel Configuration Procedure

The channel configuration word consists of bit fields, the settings of which determine how the channel operates. This procedure looks at each bit field separately and helps you configure a channel for operation. Refer to the table on page 4-5 and the bit field descriptions that follow for complete configuration information. See page B-1 for a configuration worksheet that can assist your channel configuration.

Configure Each Channel

1.
1. Determine the input device type (RTD type or resistance input) for a
1.1. channel and enter its respective 4-digit binary code in bit field 0-3 (Input Type Selection) of the channel configuration word.
2.
2. Select a data format for the data word value. Your selection determines how
2.2. the analog input value from the A/D converter is expressed in the data word. Enter your 2-digit binary code in bit field 4 and 5 (Data Format Selection) of the channel configuration word. If you have chosen proportional counts data format, you may define the scaling range. The default valves for the limit registers are 0. If the lower limit and the upper limit are both 0, the module uses -32,768 as the lower limit and +32,767 as the upper limit. If the lower limit is equal to the upper limit, a configuration error occurs. Otherwise, the module uses limit values in these registers. Make sure to enter the lower and upper limits in the scale limit registers for that channel, if you want user-defined scaling. An example on page 4-9 (user-set scaling) explains how to do this.
3.
3. Determine the desired state for the channel data word if a broken input
3.3. condition is detected for that channel (open-circuit or short- circuit). Enter the 2-digit binary code in bit field 6 and 7 (Broken Input Selection) of the channel configuration word.
4.
4. If the channel is configured for RTD inputs and engineering units data
4.4. format, determine if you want the channel data word to read in degrees Fahrenheit or degrees Celsius and enter a one or a zero in bit 8 (Temperature Units) of the configuration word. If the channel is configured for a resistance input, this field is ignored.
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4-4 Channel Configuration, Data, and Status
5.
5. Determine the desired input filter frequency for the channel and enter the
5.5. 2-digit binary code in bit field 9 and 10 (Filter Frequency Selection) of the channel configuration word. A lower filter frequency increases the channel update time, but also increases the noise rejection and channel resolution. A higher filter frequency decreases the channel update time, but also decreases the noise rejection and channel resolution.
6.
6. Determine which channels are used in your program and enable them.
6.6. Place a one in bit 11 (channel Enable) if the channel is to be used. Place a zero in bit 11 if the channel will not be used.
7.
7. Select the excitation current for the input channel. A zero in bit 12 provides
7.7. an excitation current of 1.0 mA; a 1 provides 0.25 mA. Select the excitation current value based on RTD vendor recommendations and the Input Specifications table, page A-2.
8.
8. Select the lead resistance measurement option. The module can disable lead
8.8. resistance measurement, periodically measure the lead resistance, or measure the lead resistance on each acquisition for each one of the 8 channels. Setting a channel’s lead-resistance enable bits to 00 disables the lead resistance measurement. Setting a channel’s lead resistance enable bits 01 enables the periodic measurement of the lead resistance, which occurs once every 5 minutes. Setting a channel’s lead resistance enable bits to 10 enables measurement of the lead resistance on each acquisition cycle.
9.
9. Build the channel configuration word using the configuration worksheet on
9.9. page B-1 for every channel on each RTD module repeating the procedures given in steps 1 through 9.

Enter the Configuration Data

Following the steps outlined in Chapter 5 (Ladder Programming Examples), enter your configuration data into your ladder program and copy it to the RTD module.
Publication 1746-UM003A-EN-P
Channel Configuration, Data, and Status 4-5
Table 4.1 Channel Configuration Word (O:e.0 through O:e.7) - Bit Definitions
Define To Select Make these bit settings in the Channel Configuration Word
1514131211109876543210
Input type selection 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)
(1)
(2)
120 Ni (672) 604 NiFe (518) 150
Resistance Input 1100
500
Resistance Input 1101
1000
Resistance Input 1110
3000
Resistance Input 1111
Data format selection
Engineering units x 1
Engineering units x 10
(3)
(4)
00
01
Scaled-for-PID 10 proportional counts 11
Broken input selection Set to Zero 00
Set to Upscale 01 Set to Downscale 10 Invalid 11
Temperature units selection
Degrees C
Degrees F
(5)
(5)
0
1
Filter frequency selection 28 Hz 00
50/60 Hz 01 800 Hz 10 6400 Hz 11
Channel enable Channel Disabled 0
Channel Enabled 1
Excitation current selection
1.0 mA 0
0.25 mA 1
Cal. Disable Enable 0
Disable 1
Lead R. Enable Disable 0 0
Periodic 0 1 Always 1 0 Invalid 1 1
0000 0001 0010 0011 0100 0101 0110 0111 1000
1001
1010 1011
(1) Actual value at 0 °C is 9.042 per SAMA standard RC21-4-1966.
(2) Actual value at 0 °C is 100
(3) Values are in 0.1 degree /step or 0.1
(4) Values are in 1 degree /step or 1
per DIN standard.
/step for all resistance input types, except 150Ω. For the 150Ω resistance input type, the values are in 0.01Ω/step.
/step for all resistance input types, except 150Ω. For the 150Ω resistance input type, the values are in 0.1Ω/step.
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4-6 Channel Configuration, Data, and Status
(5) This bit is ignored when a resistance device is selected.

Input Type Selection (Bits 0 through 3)

The input type bit field lets you configure the channel for the type of input device you have connected to the module. Valid input devices are shown in the previous table.

Data Format Selection (Bits 4 and 5)

The data format bit field lets you define the format for the channel data word contained in the module input image. Valid data types are engineering units, scaled-for-PID, and proportional counts. If you select proportional counts and are operating in Class 3, you have the option of using user-defined scaling (output registers O:8 through O:23). Unless you specify otherwise, the data is scaled to the full scale range for that channel.
Table 4.2 Bit Descriptions for Data Format Select
Binary Value
00 engineering units x 1 Express values in 0.1 degree or 0.1
01 engineering units x 10 Express values in 1 degree or 1
10 scaled-for-PID The input signal range for the selected input type is its
11 proportional counts The input signal range is proportional to your selected
Select Description
or 0.01for 150
pot., only
or 0.1 for150Ω pot.,
only.
full scale input range. The signal range is scaled into a 0 to 16383 range, which is what the SLC processor expects in the PID function.
input type and scaled into a -32768 to +32767 range (default) or user-set range, based on the scale limit words (O:e.8 to O:e.23)
Using Scaled-For-PID and Proportional Counts Formats
The RTD module provides eight options for displaying input channel data. These are 0.1°F, 0.1°C, 1°F, 1°C, 0.1 Counts. The first six options represent real engineering units and do not require explanation. The Scaled-for-PID selection allows you to directly interface RTD Data into a PID instruction without intermediate scale operations and Proportional Counts selection provides the highest display resolution, but also require you to manually convert the channel data to real Engineering Units.
Ω, 1Ω, Scaled-for-PID, and Proportional
Publication 1746-UM003A-EN-P
Channel Configuration, Data, and Status 4-7
Default scaling can be selected for scaled-for-PID data format and proportional counts data format. User-set scaling can be defined for proportional counts data format. For a description of default scaling, see page 4-7 (scaled-for-PID data format) and page 4-8 (proportional counts data format). For a description of user-set scaling using proportional counts data format, see page 4-9.
The equations on page 4-11 show how to convert from Scaled-for-PID to Engineering Units, Engineering Units to Scaled-for-PID, Proportional Counts to Engineering Units, and Engineering Units to Proportional Counts. To perform the conversions, you must know the defined temperature or resistance range for the channel’s input type. Refer to the Channel Data Word Format in the tables on page 4-13 and page 4-14. The lowest possible value for an input type is S
, and the highest possible value is S
LOW
HIGH
.
Scaled-for-PID - If the user selects scaled-for-PID as the data format, the data word for that channel is a number between 0 and 16383. Zero (0) corresponds to the lowest temperature value of the RTD type or the lowest resistance value (ohms). The value 16383 corresponds to the highest temperature value for that RTD or the highest resistance value (ohms). For example, if a 100 RTD (
α = 0.003916) is selected, then the relationship of temperature and
Platinum
module counts is:
Temperature Counts
-200°C 0 +630°C 16383
The following illustration shows the linear relationship between output counts and temperature when one uses scaled-or-PID data format.
Figure 4.2 Linear Relationship Between Temperature and PID Counts
Counts
16383
°C
-200°C
630°C
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4-8 Channel Configuration, Data, and Status
Proportional Counts Data Format - If the user selects proportional counts data format and uses the default limits of 0, the data word for that channel is a number between -32,768 and +32,767. This provides the greatest resolution of all scaling options. The value -32,768 corresponds to the lowest temperature value of the RTD type or the lowest resistance value (ohms). The value 32,767 corresponds to the highest temperature value for that RTD or the highest resistance value (ohms). For example, if a 100
Platinum RTD (3916) is
selected, then the relationship of temperature and module counts is:
Temperature Counts
-200°C -32768 +630°C +32767
The following illustration shows the linear relationship between output counts and temperature when one uses proportional counts data format.
Figure 4.3 Linear Relationship Between Temperature and Proportional Counts
Counts
+32767
-200°C
°C
630°C
-32768
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Channel Configuration, Data, and Status 4-9
User-Set Scaling
Proportional Counts - If the user wants to configure the module to scale the data word to something other than -32,768 to +32,767, the user defines what the upper and lower limits are going to be. However, the maximum range remains -32,768 to +32,767. The user defines what the upper and lower limits are going to be by placing the range in the user-set scaling words for that channel. The module scales the input data to the upper and lower limit in an linear relationship. The following example clarifies this feature. In this example, the RTD module channel that is configured for user-set scaling is channel 3. As shown in the following illustration, the user has programmed the channel 3 configuration word for 1000 proportional counts data format (bits 4 and 5): and configuration words 14 and 15 for scaling. The program for the following example is described on page 5-4 in chapter 5.
potentiometer (bits 0 to 3):
Configuration Word
Channel 3
Range
Channel 3
Lower scale limit set for 3
Upper scale limit set for 3
The user desires to control the line speed of a conveyor. A 1000
potentiometer is used to sense the conveyor line speed. The line speed varies between 3 ft./minute (0 ohms) and 50 ft./minute (1000 ohms).
As shown in the illustration on below, the user selects a 1000
potentiometer
as the input type. If the user chooses engineering units as the data format, the module data word is a value between 0 and 1000 ohms. However, if the user chooses the proportional counts data format and utilizes the user-set scaling feature, the number 3 can be entered in O:e.14 and the number 50 in O:e.15. In this situation, the RTD module returns a number between 3 and 50 in its data word. This action saves the user time in ladder programming.
Figure 4.4 User-set Scaling Using Proportional Counts Data Format
Selected Proportional Counts Data Format
Pot
O:e.3
O:e.14
O:e.15
Selected 1000
110000010000
0111
1100000000000000
0100110000000000
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4-10 Channel Configuration, Data, and Status
Configuration Words For User-set Scaling (Words 8 to 23)
The following illustration shows the address of the user-set limit scale words used to define the lower value and the upper value of the user-set scale words. You can use the words for a channel when proportional counts mode is selected for that channel
Any time proportional counts is selected and the upper limit is not zero, but is equal to the lower limit, a configuration error occurs. For example, if both scaling limits are 0, or if the lower range value is greater than or equal to the upper range value, a configuration error occurs.
Figure 4.5 Limit Scale Words
Channel 0
Channel 1
Channel 2
Channel 3
Channel 4
Channel 5
Channel 6
O:e.8
O:e.9
O:e.10
O:e.11
O:e.12
O:e.13
O:e.14
O:e.15
O:e.16
O:e.17
O:e.18
O:e.19
O:e.20
O:e.21
Defines lower scale limit for Ch 0
Defines upper scale limit for Ch 0
Defines lower scale limit for Ch 1
Defines upper scale limit for Ch 1
Defines lower scale limit for Ch 2
Defines upper scale limit for Ch 2
Defines lower scale limit for Ch 3
Defines upper scale limit for Ch 3
Defines lower scale limit for Ch 4
Defines upper scale limit for Ch 4
Defines lower scale limit for Ch 5
Defines upper scale limit for Ch 5
Defines lower scale limit for Ch 6
Defines upper scale limit for Ch 6
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Channel 7
O:e.22
O:e.23
Defines lower scale limit for Ch 7
Defines upper scale limit for Ch 7
Channel Configuration, Data, and Status 4-11
Scaling Examples
The following examples are using the default scaling ranges:
Scaled-for-PID to Engineering Units
Equation:
Scaled-for-PID value displayed

--------------- ------------------- ------------------- --------------- -----------
Engr Units Equivalent SLOW SHIGH - SLOW()
+=
×

16383
Assume that the input type is an RTD, Platinum (200
, a = 0.00385°C,
range = -200°C to +850°C), scaled-for-PID display type. Channel data = 3421.
Want to calculate °C equivalent.
From Channel Data Word Format, S
Solution:
Solution:
Solution:Solution:
Engr Units Equivalent 200°C 850°C - (-200°C)()
= -200°C and S
LOW

×

3421
--------------­16383
HIGH
19.25°C=+=
= 850°C.
Engineering Units to Scaled-for-PID
Equation:
()
Engr Units desired - SLOW
Scaled-for-PID Equivalent 16383
Assume that the input type is an RTD, Platinum (200 range = -200°C to +850°C), scaled-for-PID display type. Desired channel temperature = 344°C.
----------- --------------- --------------- -------------- --------------- ----
×=
SHIGH - SLOW()
, a = 0.00385°C,
Want to calculate Scaled-for-PID equivalent.
From Channel Data Word Format, S
= -200°C and SHIGH = 850°C.
LOW
Solution:
()+
344°C -200°C
Scaled-for-PID Equivalent 16383
-------------- --------------- ---------- --------
× 8488==
850°C- (-200°C)
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4-12 Channel Configuration, Data, and Status
Proportional Counts to Engineering Units
Equation:
Engr Units Equivalent SLOW SHIGH - SLOW()

+=
 
Proportional Counts value displayed + 32768()
--------------- ------------------- --------------- -------------- -------------------- -------------- -------------------- ----
×
Assume that input type is a potentiometer (1000 proportional counts display type. Channel data = 21567.
Want to calculate ohms equivalent.
From Channel Data Word Format, S
= 0 and S
LOW
Solution:
Engr Units Equivalent 0 1000 ohms - 0 ohms[]
  
------------ -------------- --------------- ---
×
Engineering Units to Proportional Counts
Equation:
Proportional Counts Equivalent 65536
  
()
Engr Units desired - SLOW
------------ -------------- --------------- --------------- -------------- ----
×
SHIGH - SLOW()
65536
, range = 0 to 1000Ω),
= 1000Ω.
HIGH
21567 32768+()
65536
826 ohms=+=
- 32768=
Publication 1746-UM003A-EN-P
Assume that input type is a potentiometer (3000 proportional counts display type. Desired channel resistance value = 1809
, range = 0 to 3000Ω),
Ω.
Want to calculate Proportional Counts equivalent.
From Channel Data Word Format, S
= 0 and S
LOW
HIGH
= 3000Ω.
Solution:
Prop. Counts = {65536 x [1809 ohms - 0 ohms]} -32768 = 6750
The following table shows the temperature ranges of several 1746-NR8 RTDs. The table applies to both 0.25 and 1.0 mA excitation currents. The temperature ranges of the remaining RTDs vary with excitation current, for example, 1000
Platinum 385, 1000Ω Platinum 3916, and 10Ω Copper 426.
Channel Configuration, Data, and Status 4-13
Table 4.3 Data Formats for RTD Temperature Ranges for 0.25 and 1.0 mA Excitation Current
RTD Input Type Data Format
Engineering Units x 1 Engineering Units x 10 Scaled-for-PID Proportional Counts
0.1°C 0.1°F 1.0°C 1.0°F
Platinum (385) -2000 to +8500 -3280 to +15620 -200 to +850 -328 to +1562 0 to 16383 -32768 to 32767
100
Platinum (385) -2000 to +6300 -3280 to + 6300 -200 to +630 -328 to +630 0 to 16383 -32768 to 32767
200
Platinum (3916) -2000 to +6300 -3280 to +6300 -200 to +630 -328 to +630 0 to 16383 -32768 to 32767
100
Platinum (3916) -2000 to +6300 -3280 to +6300 -200 to +630 -328 to +630 0 to 16383 -32768 to 32767
200
Nickel (672) -800 to +2600 -3280 to +5000 -80 to +260 -328 to +500 0 to 16383 -32768 to 32767
120
(1)
Nickel (618)
120
Copper (426) -1000 to +2600 -3280 to +5000 -100 to +260 -328 to +500 0 to 16383 -32768 to 32767
10
(1) Actual value at 0 °C is 100per DIN standard.
-1000 to +2600 -3280 to +5000 -100 to +260 -328 to +500 0 to 16383 -32768 to 32767
(Default)
Table 4.4 Data Format for 500
ΩΩΩΩ
Platinum RTD (385)
Excitation Current Data Format
Engineering Units x 1 Engineering Units x 10 Scaled-for-PID Proportional Counts
0.1
C 0.1°F 1.0°C 1.0°F
(Default)
0.25 mA -2000 to +8500 -3280 to +15620 -200 to +850 -328 to +1562 0 to 16383 -32768 to 32767
1.0 mA -2000 to +3900 -3280 to +6980 -200 to +390 -328 to +698 0 to 16383 -32768 to 32767
Table 4.5 Data Format for 1000
ΩΩΩΩ
Platinum RTD (385)
Excitation Current Data Format
Engineering Units x 1 Engineering Units x 10 Scaled-for-PID Proportional Counts
0.1
C 0.1°F 1.0°C 1.0°F
(Default)
0.25 mA -2000 to +8500 -3280 to +15620 -200 to +850 -328 to +1562 0 to 16383 -32768 to 32767
1.0 mA -2000 to +500 -3280 to +1220 -200 to +50 -328 to +122 0 to 16383 -32768 to 32767
Table 4.6 Data Format for 500
ΩΩΩΩ
Platinum RTD (3916)
Excitation Current Data Format
Engineering Units x 1 Engineering Units x 10 Scaled-for-PID Proportional Counts
0.1
C 0.1°F 1.0°C 1.0°F
(Default)
0.25 mA -2000 to +6300 -3280 to +11660 -200 to +630 -328 to +1166 0 to 16383 -32768 to 32767
1.0 mA -2000 to +3800 -3280 to +6980 -200 to +380 -328 to +698 0 to 16383 -32768 to 32767
Table 4.7 Data Format for 1000
ΩΩΩΩ
Platinum RTD (3916)
Excitation Current Data Format
Engineering Units x 1 Engineering Units x 10 Scaled-for-PID Proportional Counts
0.1
C 0.1°F 1.0°C 1.0°F
(Default)
0.25 mA -2000 to +6300 -3280 to +11660 -200 to +630 -328 to +1166 0 to 16383 -32768 to 32767
1.0 mA -2000 to +500 -3280 to +1220 -200 to +50 -328 to +122 0 to 16383 -32768 to 32767
Table 4.8 Data Format for 604
ΩΩΩΩ
Nickel Iron RTD (518)
Excitation Current Data Format
Engineering Units x 1 Engineering Units x 10 Scaled-for-PID Proportional Counts
0.1°C 0.1°F 1.0°C 1.0°F
(Default)
0.25 mA -2000 to +2000 -3280 to +3920 -200 to +200 -328 to +392 0 to 16383 -32768 to 32767
1.0 mA -2000 to +1800 -3280 to +3380 -200 to +180 -328 to +338 0 to 16383 -32768 to 32767
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4-14 Channel Configuration, Data, and Status
The following tables show the resistance ranges provided by the 1746-NR8.
Table 4.9 Data Format for 150
Resistance Input
ΩΩ
Resistance Input Type Data Format
Engineering Units x 1 Engineering Units x 10 Scaled-for-PID Proportional Counts
0.01
(1)
0.1
(1)
(Default)
150 0 to 15000 0 to 1500 0 to 16383 -32768 to 32767
(1) When ohms are selected, the temperature-units selection (bit 8) is ignored.
Table 4.10 Data Format for 500
ΩΩΩΩ and 1000
ΩΩΩΩ
Resistance Input
Resistance Input Type Data Format
Engineering Units x 1 Engineering Units x 10 Scaled-for-PID Proportional Counts
0.1
(1)
1.0
(1)
(Default)
500 0 to 5000 0 to 500 0 to 16383 -32768 to 32767
0 to 10000 0 to 1000 0 to 16383 -32768 to 32767
1000
(1) When ohms are selected, the temperature-units selection (bit 8) is ignored.
Table 4.11 Data Format for 3000
ΩΩΩΩ Resistance Input
Excitation Current Data Format
Engineering Units x 1 Engineering Units x 10 Scaled-for-PID Proportional Counts
0.1
(1)
1.0
(1)
(Default)
0.25 mA 0 to 30000 0 to 3000 0 to 16383 -32768 to 32767
1.0 mA 0 to 12000 0 to 1200 0 to 16383 -32768 to 32767
(1) When ohms are selected, the temperature-units selection (bit 8) is ignored.
The following table shows the data resolution provided by the 1746-NR8 for RTD input types using the various data formats. The table applies to both 0.25 and 1.0 mA excitation currents. The data resolution of the remaining RTDs vary with excitation current.
Table 4.12 Channel Data Word Resolution for RTDs
RTD Input Type
Data Format (Bits 4 and 5) Engineering Units x 1 Engineering Units x 10Scaled-for-PID Proportional Counts
°C °F °C °F °C °F °C °F
Platinum 385 0.1°C/step 0.1°F/step 1°C/step 1°F/step 0.0641°C/step 0.1154°F/step 0.0160°C/step 0.0288°F/step
100
Platinum 385 0.1°C/step 0.1°F/step 1°C/step 1°F/step 0.0641°C/step 0.1154°F/step 0.0160°C/step 0.0288°F/step
200
Platinum 3916 0.1°C/step 0.1°F/step 1°C/step 1°F/step 0.0507°C/step 0.0912°F/step 0.0127°C/step 0.0228°F/step
100
Platinum 3916 0.1°C/step 0.1°F/step 1°C/step 1°F/step 0.0507°C/step 0.0912°F/step 0.012 °C/step 0.0228°F/step
200
Copper 426 0.1°C/step 0.1°F/step 1°C/step 1°F/step 0.0220°C/step 0.0396°F/step 0.0051°C/step 0.0099°F/step
10
(2)
Nickel 618
120
Nickel 672 0.1°C/step 0.1°F/step 1°C/step 1°F/step 0.0208°C/step 0.0374°F/step 0.005 °C/step 0.0093°F/step
120
(1) When ohms are selected, the temperature-units selection (bit 8) is ignored. Analog input data is the same for either °C or °F selection.
(2) Actual value at 0°C is 100
0.1°C/step 0.1°F/step 1°C/step 1°F/step 0.0220°C/step 0.0396°F/step 0.0051°C/step 0.0099°F/step
per DIN standard.
(1)
(Default)
Publication 1746-UM003A-EN-P
Channel Configuration, Data, and Status 4-15
Excitation Current
Table 4.13 Channel Data Word Resolution for 500
Data Format (Bits 4 and 5)
(1)
Platinum (385)
ΩΩ
Engineering Units x 1 Engineering Units x 10Scaled-for-PID Proportional Counts
(Default)
°C °F °C °F °C °F °C °F
0.25 mA 0.1°C/step 0.1°F/step 1°C/step 1°F/step 0.0641°C/step 0.1154°F/step 0.0160°C/step 0.0288°F/step
1.0 mA 0.1°C/step 0.1°F/step 1°C/step 1°F/step 0.0360°C/step 0.0648°F/step 0.0090°C/step 0.0162°F/step
(1)
                
ΩΩΩΩ Platinum (385)
Excitation Current
Table 4.14 Channel Data Word Resolution for 1000
Data Format (Bits 4 and 5)
(1)
Engineering Units x 1 Engineering Units x 10Scaled-for-PID Proportional Counts
(Default)
°C °F °C °F °C °F °C °F
0.25 mA 0.1°C/step 0.1°F/step 1°C/step 1°F/step 0.0641°C/step 0.1154°F/step 0.0160°C/step 0.0288°F/step
1.0 mA 0.1°C/step 0.1°F/step 1°C/step 1°F/step 0.0153°C/step 0.0275°F/step 0.0038°C/step 0.0069°F/step
(1)
                
ΩΩΩΩ Platinum (3916)
Excitation Current
Table 4.15 Channel Data Word Resolution for 500
Data Format (Bits 4 and 5)
(1)
Engineering Units x 1 Engineering Units x 10Scaled-for-PID Proportional Counts
(Default)
°C °F °C °F °C °F °C °F
0.25 mA 0.1°C/step 0.1°F/step 1°C/step 1°F/step 0.0507°C/step 0.0912°F/step 0.0127°C/step 0.0228°F/step
1.0 mA 0.1°C/step 0.1°F/step 1°C/step 1°F/step 0.0354°C/step 0.0637°F/step 0.0089°C/step 0.0159°F/step
(1)
                
ΩΩΩΩ Platinum (3916)
Excitation Current
Table 4.16 Channel Data Word Resolution for 1000
Data Format (Bits 4 and 5)
(1)
Engineering Units x 1 Engineering Units x 10Scaled-for-PID Proportional Counts
(Default)
°C °F °C °F °C °F °C °F
0.25 mA 0.1°C/step 0.1°F/step 1°C/step 1°F/step 0.0507°C/step 0.0912°F/step 0.0127°C/step 0.0228°F/step
1.0 mA 0.1°C/step 0.1°F/step 1°C/step 1°F/step 0.0153°C/step 0.0275°F/step 0.0038°C/step 0.0104°F/step
(1)
                
ΩΩΩΩ Nickel Iron (518)
Excitation Current
Table 4.17 Channel Data Word Resolution for 604
Data Format (Bits 4 and 5)
(1)
Engineering Units x 1 Engineering Units x 10Scaled-for-PID Proportional Counts
(Default)
°C °F °C °F °C °F °C °F
0.25 mA 0.1°C/step 0.1°F/step 1°C/step 1°F/step 0.0183°C/step 0.0330°F/step 0.0046°C/step 0.0082°F/step
1.0 mA 0.1°C/step 0.1°F/step 1°C/step 1°F/step 0.0232°C/step 0.0417°F/step 0.0058°C/step 0.0104°F/step
(1)
                
Publication 1746-UM003A-EN-P
4-16 Channel Configuration, Data, and Status
The following two tables show the data resolution provided by the 1746-NR8 for resistance input types using the various data formats.
Table 4.18 Channel Data Word Resolution for 150
Resistance Input Type
0.01/step 0.1/step 0.0092/step 0.0023/step
150
Table 4.19 Channel Data Word Resolution for 500 Inputs
Resistance Input Type
0.1/step 1/step 0.0305/step 0.0076/step
500
0.1/step 1/step 0.0610/step 0.0153/step
1000
0.1/step 1/step 0.1831/step 0.0458/step
3000
Data Format (Bits 4 and 5) Engineering Units
x 1
Ohms Ohms Ohms Ohms
Data Format (Bits 4 and 5) Engineering Units
x 1
Ohms Ohms Ohms Ohms
Engineering Units x 10
Engineering Units x 10
Resistance Input
ΩΩ
Scaled-for-PID Proportional
Counts (Default)
ΩΩΩΩ, 1000ΩΩΩΩ, and 3000ΩΩΩΩ Resistance
Scaled-for-PID Proportional
Counts (Default)

Broken Input Selection (Bits 6 and 7)

The next table shows the descriptions for bits 6 and 7. The broken input bit field lets you define the state of the channel data word when an open-circuit or short-circuit condition is detected for that channel.
An open-circuit condition occurs when the RTD or potentiometer or its extension wire is physically separated or opened. This can happen if the wire is cut or disconnected from the terminal block.
The short-circuit condition applies only to RTD input types. This can happen if the RTD or its signal wires are shorted together for any reason. The short-circuit condition does not apply to resistance ranges since they start at 0 ohms, which can be a short-circuit condition.
Table 4.20 Bit Descriptions for Broken Input Selection
Binary Value
00 Zero Force the channel data word to 0 during an open-circuit condition
01 Upscale Force the channel data word value to its full scale value during an
10 Downscale Force the channel data word value to its low scale value during
Select Description
or short-circuit condition.
open-circuit or short-circuit condition. The full scale value is determined by the input type, data format, and scaling selected.
an open-circuit or short-circuit condition. The low scale value is determined by the input type, data format, and scaling selected.
Publication 1746-UM003A-EN-P
Channel Configuration, Data, and Status 4-17

Temperature Units Selection (Bit 8)

The following table shows the description for bit 8. The temperature units bit lets you select temperature engineering units in °C or °F for RTD input types. This bit field is only active for RTD input types. It is ignored when the resistance input type is selected.
Table 4.21 Bit Descriptions for Temperature Units Selection
Binary Value
0 °C display the channel data word in °C. 1 °F display the channel data word in °F.
Select If you want to

Filter Frequency Selection (Bits 9 and 10)

The following table shows the descriptions for bits 9 and 10. The channel filter frequency bit field lets you select one of four filters available for a channel. The filter frequency affects the channel update time and noise rejection characteristics (refer to Chapter 3 for details).
Table 4.22 Bit Descriptions for Filter Frequency Selection
Binary Value
00 28 Hz Provide both 50 Hz and 60 Hz AC line noise filtering. This setting
01 50/60 Hz Provide both 50 Hz and 60 Hz AC line noise filtering. 10 800 Hz Provide 800 Hz AC line noise filtering. 11 6400 Hz Provide 6400 Hz AC noise filtering. This setting decreases the
Select Description
increases the channel update time, but also increases the noise rejection.
noise rejection, but also decreases the channel update time.

Channel Enable Selection (Bit 11)

The next table shows the description for bit 11. You use the channel enable bit to enable a channel. The RTD module only scans those channels that are enabled. To optimize module operation and minimize throughput times, you should disable unused channels by setting the channel enable bit to zero.
When set (1), the channel enable bit is used by the module to read the configuration word information you have selected. While the enable bit is set, modification of the configuration word may lengthen the module update time for one cycle. If any change is made to the configuration word, the change must be reflected in the status word before new data is valid. (Refer to Channel Status Checking on page 4-19.)
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4-18 Channel Configuration, Data, and Status
While the channel enable bit is cleared (0), the channel data word and status word values are cleared. After the channel enable bit is set, the channel data word and status word remain cleared until the RTD module sets the channel status bit (bit 11) in the channel status word.
Table 4.23 Bit Descriptions for Channel Enable Selection
Binary Value Select If you want to
0 channel disable disable a channel. Disabling a channel causes the
channel data word and the channel status word to be cleared.
1 channel enable enable a channel.

Excitation Current Selection (Bit 12)

The following table shows the description for bit 12. Use this bit to select the magnitude of the excitation current for each enabled channel. Choose from either 1.0 mA or 0.25 mA. This bit field is active for all inputs. A lower current reduces the error due to RTD self heating, but provides a lower signal-to-noise ratio. Refer to RTD vendor for recommendations. See Appendix A for general information.
Table 4.24 Bit Description for Excitation Current Selection
Binary Value
0 1.0 mA Set the excitation current to 1.0 mA. 1 0.25 mA Set the excitation current to 0.25 mA.
Select Description

Calibration Disable (Bit 13)

The module can disable or enable periodic calibration by setting the calibration disable bit for channel 0. Setting this bit to 0 enables the periodic calibration, which occurs once every 5 minutes. Setting this bit to 1 disables the periodic calibration

Lead Resistance Measurement Enable (Bits 14 and 15)

The module can disable lead resistance measurement, periodically measure the lead resistance, or measure the lead resistance on each acquisition for each one of the 8 channels. Setting a channel’s lead resistance enable bits to 00 disables the lead resistance measurement. Setting a channel’s lead resistance enable bits to 01 enables the periodic measurement of the lead resistance, which occurs once every five minutes. Setting a channel’s lead resistance enable bits to 10 enables measurement of the lead resistance on each acquisition cycle.
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Channel Configuration, Data, and Status 4-19

Channel Data Word

The actual RTD or resistance input sensor values reside in I:e.0 through I:e.7 of the RTD module input image file. The data values present depend on the input type and data format you have selected in your configuration for the channel. When an input channel is disabled, its data word is reset (0).
Two conditions must be true for the value of the data word to be valid:
The channel must be enabled (channel status bit = 1).
There must be no channel errors or channel LED on (channel error bit = 0)
Figure 4.6 Module Input Image (Data Words)
I:e.0
I:e.1
I:e.2
I:e.3
I:e.4
I:e.5
I:e.6
Channel 0 Data Word
Channel 1 Data Word
Channel 2 Data Word
Channel 3 Data Word
Channel 4 Data Word
Channel 5 Data Word
Channel 6 Data Word

Channel Status Checking

I:e.7
Channel 7 Data Word
The channel status word is a part of the RTD module’s input image. Input words 8 through 15 (Class 3 only) correspond to and contain the configuration status of channels 0 through 7 respectively. You can use the data provided in the status word to determine if the data word for any channel is valid per your configuration in O:e.0 through O:e.7 or O:e.23 (Class 3 only).
For example, whenever a channel is disabled (O:e.x/11 = 0), its corresponding status word shows all zeros. This condition tells you that input data contained in the data word for that channel is not valid and should be ignored.
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4-20 Channel Configuration, Data, and Status
Figure 4.7 Module Input Image (Status Word)
I:e.8
I:e.9
I:e.10
I:e.11
I:e.12
I:e.13
I:e.14
I:e.15
Channel 0 Status Word
Channel 1 Status Word
Channel 2 Status Word
Channel 3 Status Word
Channel 4 Status Word
Channel 5 Status Word
Channel 6 Status Word
Channel 7 Status Word
The channel status word can be analyzed bit by bit. Each bit’s status (0 or 1) tells you how the input data from the RTD sensor or resistance device connected to a specific channel is translated for your application. The bit status also informs you of any error condition and can tell you what type error occurred.
A bit-by-bit examination of the status word is provided in the following table.
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Channel Configuration, Data, and Status 4-21
Table 4.25 Channel 0 through 7 Status Word (I:e.8 through I:e.15) - Bit Definitions
Bit(s) Define These bit settings Indicate this
1514131211109876543210
0 through 3 Input type
status
0000100Ω Pt RTD (385) 0001200Ω Pt RTD (385) 0010500Ω Pt RTD (385) 00111000Ω Pt RTD (385) 0100100Ω Pt RTD (3916) 0101200Ω Pt RTD (3916) 0110500Ω Pt RTD (3916) 01111000Ω Pt RTD (3916)
1000
1001
10
Cu RTD (426)
120
Ni RTD (618)
1010120Ω Ni RTD (672) 1011604Ω NiFe RTD (518) 1100150Ω Resistance Input 1101500Ω Resistance Input 11101000Ω Resistance Input 11113000Ω Resistance Input
4 through 5 Data format
status
00
01
Engineering units x 1
Engineering units x 10 10 Scaled-for-PID 11 Proportional Counts
6 through 7 Broken input
status
00 Set to Zero 01 Set to Upscale 10 Set to Downscale 11 Not used
8 Temperature
units status
9 through 10 Filter frequency
status
0
1
Degrees C
Degrees F
00 28 Hz 01 50/60 Hz
(5)
(5)
10 800 Hz 11 6400 Hz
11 Channel enable
status
12 Calibration Error
0 Channel Disabled
1 Channel Enabled 0 OK 1 Error
13 Broken input
0 OK 1 Error
14 Out-of-range
error status
15 Configuration
Error
(1) Actual value at 0°C is 9.042Ω per SAMA standard RC21-4-1966. (2) Actual value at 0°C is 100Ω per DIN standard. (3) Values are in 0.1 degree /step or 0.1/step for all resistance input types, except 150Ω. For the 150 resistance input type, the values are in 0.01/step. (4) Values are in 1 degree /step or 1/step for all resistance input types, except 150Ω. For the 150 resistance input type, the values are in 0.1Ω/step.
(5) This bit is cleared (0) when a resistance device, such as a potentiometer, is selected.
0 OK
1 Error 0 1
OK Error
(1)
(2)
(3)
(4)
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4-22 Channel Configuration, Data, and Status
Explanations of the status conditions follow.
IMPORTANT
The status bits reflect the settings that were made in the configuration word. However, two conditions must be true if the status reflected is to be accurate:
The channel must be enabled.
The channel must have processed any new configuration
data.

Input Type Status (Bits 0 through 3)

The input type bit field indicates what type of input device you have configured for the channel. This field reflects the input type selected in bits 0 through 3 of the channel configuration word when the channel is enabled. If the channel is disabled, these bits are cleared (0).

Data Format Status (Bits 4 and 5)

The data format bit field indicates the data format you have defined for the channel. This field reflects the data type selected in bits 4 and 5 of the channel configuration word when the channel is enabled. If the channel is disabled, these bits are cleared (0).
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Broken Input Status (Bits 6 and 7)

The broken input bit field indicates how you have defined the channel data to respond to an open-circuit or short-circuit condition. This field reflects the broken input type selected in bits 6 and 7 of the channel configuration word when the channel is enabled. If the channel is disabled, these bits are cleared (0).

Temperature Units Status (Bit 8)

The temperature units field indicates the state of the temperature units bit in the configuration word (bit 8). This feature is only active for RTD input types with the channel enabled. This bit is cleared (0) if the channel is disabled or if the input type is a resistance device such as potentiometer.
Channel Configuration, Data, and Status 4-23

Channel Filter Frequency (Bits 9 and 10)

The channel filter frequency bit field reflects the filter frequency you selected in bits 9 and 10 of the configuration word when the channel is enabled. This feature is active for all input types. If the channel is disabled, these bits are cleared (0).

Channel Enable Status (Bit 11)

The channel enable status bit indicates whether the channel is enabled or disabled. This bit is set (1) when the channel enable bit is set in the configuration word (bit 11) and there is valid data in the channel’s data word. The channel status bit is cleared (0) if the channel is disabled.

Calibration Error (Bit 12)

If a calibration error occurs this flag is set. A calibration error is a fatal error. It indicates that the module was not able to complete its on board calibration process. A calibration error could effect individual channels, but may get set on all channels at the same time if the ADC has a hardware fault.

Broken Input Error (Bit 13)

This bit is set (1) whenever an enabled channel detects a broken input condition. A broken input error is declared for the following reasons:
Open-circuit - excitation current is less than 50% of the selected current.
Short-circuit - calculated lead wire compensated RTD resistance is less than 3
ohms.
The open-circuit error is active for all RTD and resistance inputs, while the short-circuit error is valid only for RTD inputs. If a broken input is detected, the module sends either zero, upscale, or downscale data to the channel data word for that channel, depending on your channel configuration bits 6 and 7.
A broken input error takes precedence over an out-of-range error states. There is not an out-of-range error when an open-circuit or short circuit is detected.
This bit is cleared if the channel is disabled or if the channel operation is normal.
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4-24 Channel Configuration, Data, and Status

Out-Of-Range Error (Bit 14)

This bit is set (1) whenever a configured channel detects an over-range condition for the input channel data, regardless of input type. This bit is also set (1) whenever the module detects an under-range condition when the input type is an RTD. An out-of-range error is declared for either of the following conditions:
Over-range - The RTD temperature is greater than the maximum allowed
(default or user-set) temperature or the resistance input type is greater than the maximum allowed (default or user-set) resistance. When this occurs, the channel data word is set to its maximum value.
Under-range - The RTD temperature is less than the minimum allowed
(default or user-set) temperature. When this occurs, the channel data word is set to its minimum value.
IMPORTANT
There is no under-range error for a direct resistance input (default scaling).
This bit is cleared (0) for the following conditions:
Channel is disabled.
Channel operation is normal, the out-of-range condition clears
Broken input error bit (bit 13) is set (1).

Configuration Error (Bit 15)

This bit is set (1) whenever an enabled and configured channel detects that the channel configuration word is not valid. A configuration word is not valid for any of the following reasons:
Input type is a 10 Copper RTD and the excitation current is set for 0.25
mA, which is not allowed.
Lead R Enable bits 14 and 15 are set to 11, which is invalid.
Broken Input select bits 6 and 7 are set to 11, which is invalid.
Data format bits are set to 11, and the lower limit user-set scale is equal to
the upper limit user-set scale and not equal to 0.
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All other status bits reflect the settings from the configuration word (even those settings that may be in error). However, bit 15 is cleared if the channel is disabled or if channel operation is normal.
Chapter
5
Ladder Programming Examples
Earlier chapters explained how the configuration word defines the way a channel operates. This chapter shows the programming required to enter the configuration word into the processor memory. It also provides you with segments of ladder logic specific to unique situations that might apply to your programming requirements. The example segments include:
initial programming of the configuration word
dynamic programming of the configuration word
verifying channel configuration changes
interfacing the RTD module to a PID instruction
using proportional counts scaling (example)
monitoring channel status bits
invoking autocalibration

Device Configuration

Pilot Light O:2/1
Pilot Light O:2/0
Push-button Switch I:1/1
The following illustration is used for clarification of the ensuing ladder logic examples and is not intended to represent an RTD application.
IMPORTANT
1746-NR8 RTD Module
1746-OB8 DC Output Module (Sourcing)
1746-IB8 DC Input Module (Sinking)
SLC Processor
Ch 0 Alarm Ch 1 Alarm Ch 2 Alarm Ch 3 Alarm
Autocalibration
F8
Chapter 7 shows a typical application for the RTD module.
RTD 0
RTD 1
RTD 2
RTD 3
Pilot Light O:2/3
Pilot Light O:2/2
Selector Switch I:1/0
1230
Display Panel
Slot #
˚
C
°
F
1 Publication 1746-UM003A-EN-P
5-2 Ladder Programming Examples

Initial Programming

111 0
To enter data into the channel configuration word (O:e.0 through O:e.7) when the channel is disabled (bit 11 = 0), follow the example below.
Refer to page 4-5 for specific configuration details.
Example - Configure eight channels of a RTD module residing in slot 3 of a 1746 chassis. Configure the first four channels with one set of parameters, and the last four channels with a different set of parameters.
Figure 5.1 Configuration Word Setup for Channels 0 through 3
11121415 13
10
910 8
16700
1
45
0
1
000
Bit Number
0123
Bit Setting
0
Configures Channel For:
Platinum RTD
100
Scaled-for-PID
Broken Input (Zero Data Word)
Degrees Fahrenheit (°F)
50/60 Hz Filter Frequency
Channel Enabled
0.25 mA Excitation Current
Calibration Enabled
Lead R Always
Figure 5.2 Configuration Word Setup for Channels 4 Through 7
11121415 13
001 1
11
910 8
0
06701
45
1
0
100
0123
0
Configures Channel For:
10
Copper RTD (426)
Engineering Units x 10
Broken Input (Set Upscale)
Degrees Celsius (°C)
800 Hz Filter Frequency
Channel Enabled
0.25 mA Excitation Current
Calibration Disabled
Lead R Periodic
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Ladder Programming Examples 5-3
This example transfers configuration data and sets the channel enable bits of all eight channels with a single file copy instruction. The file copy instruction copies 8 data words from an integer file you create in the SLC’s memory, to the RTD module’s channel configuration words. This procedure is described below.
Figure 5.3 Copy File Data Flow
Address Address
NI0:0
NI0:1
NI0:2
NI0:3 NI0:4
NI0:5
NI0:6
NI0:7
Source Data File Destination Data File
Channel Configuration Word 0
Channel Configuration Word 1
Channel Configuration Word 2
Channel Configuration Word 3 Channel Configuration Word 4
Channel Configuration Word 5
Channel Configuration Word 6
Channel Configuration Word 7
Channel Output Word 0
O:3.0 O:3.1
Channel Output Word 1
O:3.2
Channel Output Word 2
Channel Output Word 3
O:3.3
Channel Output Word 4
O:3.4
O:3.5
Channel Output Word 5
O:3.6
Channel Output Word 6
Channel Output Word 7
O:3.7
Procedure
1.
1. Using the memory map function to create a data file, create integer file
1.1. N10. Integer file N10 should contain eight elements (N10:0 through N10:7).
2.
2. Using the RSLogix 500 data monitor function, enter the configuration
2.2. parameters for all eight RTD channels into a source integer data file N10. Refer to the Configuration Word Setup illustration for the bit values. See Appendix B for a channel configuration worksheet.
Bit 1514131211109876543210
N10:0 1011101100100000 N10:1 1011101100100000 N10:2 1011101100100000 N10:3 1011101100100000 N10:4 0101110001011000 N10:5 0101110001011000 N10:6 0101110001011000 N10:7 0101110001011000
3.
3. Use the copy file instruction (COP) to copy the contents of integer file
3.3. N10 to the eight consecutive output words of the RTD module beginning with O:3.0. To do this, program a rung as shown below. All elements are copied from the specified source file to the destination during the first scan following power up.
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5-4 Ladder Programming Examples
On power up, bit S:1/15 is set for the first program scan and integer file N10 is sent to the RTD module channel configuration word.

Dynamic Programming

Rung 2:0
Rung 2:1
Initialize RTD moduleFirst Pass Bit
S:1
] [
15
COP COPY FILE Source #N10:0 Dest #O:3.0 Length 8
The ladder below explains how to change data in the channel configuration word when the channel is currently enabled.
Example - Execute a dynamic configuration change to channel 2 of the RTD module located in slot 3 of a 1746 chassis. Change from monitoring the temperature in °F to monitoring in °C.
Figure 5.4 Program to Change Configuration Word Data
Set up all eight channels.
S:1
] [
15
Set channel 2 to display in °C (off) or °F (on).
I:1.0
] [
0
O:3.2
( )
8
COP COPY FILE Source #N10:0 Dest #O:3.0 Length 8

Verifying Channel Configuration Changes

Rung 2:2
END
When executing a dynamic channel configuration change, there is always a delay from the time the ladder program makes the change to the time the RTD module gives you a data word using that new configuration information. Therefore, it is very important to verify that a dynamic channel configuration change took effect in the RTD module, particularly if the channel being dynamically configured is used for control.
Example - Execute a dynamic configuration change to channel 2 of the RTD module located in slot 3 of a 1746 chassis and set an internal “data valid” bit when the new configuration has taken effect.
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Figure 5.5 Program to Verify Configuration Word Data Changes
Set up all eight NR8 configuration registers. Registers N10:0 through N10:7 must be loaded with the appropriate configuration words prior to execution.
First Pass
S:1
0000
15
Ladder Programming Examples 5-5
COP Copy File Source Dest Length
#N10:0 #O:3.0 8
I:1.0
0001
0
This rung is used to verify the configuration word after a dynamic change. Alarm bits can also be programmed in this rung to check for status errors.
0002
EQU Equal Source A
Source B
0003

Interfacing to the PID Instruction

O:3.2
8
I:3.10 0< O:3.2 0<
The RTD module was designed to interface directly to the SLC 5/02, SLC 5/03, SLC 5/04 and SLC 5/05 PID instruction without the need for an intermediate scale operation. Use RTD channel data as the process variable in the PID instruction.
B3:0
2
END
To program this application, proceed as follows:
1.
1. Select 100
1.1.
Platinum RTD, α= 0.003916, as the input type by setting bit
0 = 0, bit 1 = 0, bit 2 = 1 and bit 3 = 0 in the configuration word.
2.
2. Select scaled-for-PID as the data type by setting bit 4 = 0 and bit 5 = 1 in
2.2. the configuration word.
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5-6 Ladder Programming Examples
0000
0001
ATTENTION
!!!!
When using the module’s scaled-for-PID data format with the SLC PID function, ensure that the PID instruction parameters Maximum Scaled S
Scaled S
(word 8) match the module’s minimum and
min
(word 7) and Minimum
max
maximum scaled range, in engineering units, (e.g. -200°C to +850°C) for each channel. This allows you to accurately enter the setpoint in engineering units (°C, °F).
Figure 5.6 Programming for PID Application
Use register N10:0 as configuration word for channel 0.
First Pass
S:1
15
Entering Address N11:0 allocates elements N11:0 to N11:22 for required Control Block file length of 23 words. The Process Variable is address I:3.0, which stores the value of input data word 0 (channel 0). Output of the PID instruction is stored at address N11:23 (Control Variable Address).
I:3.8
11
PID PID Control Block Process Variable Control Variable Control Block Length Setup Screen
Move Source
Dest
MOV
N10:0 0< O:3.0 0<
N11:0 I:3.0 N11:23 23
0002
Publication 1746-UM003A-EN-P
END
Ladder Programming Examples 5-7

Using the Proportional Counts Data Format with the User-set Scaling (Class 3)

Ten elements are copied from the specified source address (N10:0) to the specified output (O:3.0). Each element is a 16-bit integer as shown in the data table at the bottom of the page.
The RTD module can be set up to return data to the user program that is specific to the application. Assume that the user controls the line speed of a conveyor using a 1000
potentiometer connected to channel 0 of the RTD
module. The line speed will vary between 3 feet/minute when the potentiometer is at 0 1000
Ω.
and 50 feet/minute when the potentiometer is at
Example - Configure the RTD module in Class 3 operation to return a value between 3 and 50 in the data word for channel 0. Proceed as follows:
1.
1. Set bits 0 through 3 of configuration word 0 to 1110 to select the
1.1. 1000
potentiometer input type.
2.
2. Set bits 4 and 5 of configuration word 0 to 11 to select proportional counts
2.2. data format.
3.
3. Enter 3 as the low range into N10:8.
3.3.
4.
4. Enter 50 as the high range into N10:9.
4.4.
Figure 5.7 Programming for PID Applications)
Rung 2:0
First Pass Bit Initialize RTD module.
S:1
] [
15
COP COPY FILE Source #N10:0 Dest #O:3.0 Length 10
Rung 2:1
The
Source
of this instruction is the data word from the
RTD module, which is a number between 3 and 50. The
Dest
in this application is an analog output channel controlling the speed of the conveyor motor drive. The Rate and Offset parameters should be set per your application. Refer to the S
Instruction Set Reference Manual
1747-6.15) or the 1746-6.4) for specific examples of the SLC instruction.
LC 500 and MicroLogix 1000
(publication
Analog I/O User Manual
(publication
Rung 2:2
For Class 3 operation registers N10:8 and N10:9 can be used to scale channel 0 for a minimum conveyor speed of 3 ft./minute and a maximum conveyor speed of 50 ft./minute
I:3.8
] [
11
SCL
SCALE Source I:3.0
Rate [/10000]
Offset
Dest
END
Publication 1746-UM003A-EN-P
5-8 Ladder Programming Examples
Table 5.1 Data Table (Class 3)
Address 1514131211109876543210
N10:0 0010100000111110
N10:1 0000000000000000
N10:2 0000000000000000
N10:3 0000000000000000
N10:4 0000000000000000
N10:5 0000000000000000
N10:6 0000000000000000
N10:7 0000000000000000
N10:8 0000000000000011
N10:9 0000000000110010

Monitoring Channel Status Bits

The following illustration shows how to monitor the open- and short-circuit error bits of each channel and set an alarm in the processor if one of the RTDs or resistance-input devices (such as a potentiometer) opens or shorts. An open-circuit error can occur if the RTD or resistance-input device breaks or one of the RTD or resistance-input device wires get cut or disconnected from the terminal block. A short-circuit condition applies only to RTD input.
Publication 1746-UM003A-EN-P
0000
First Pass
S:1
15
Figure 5.8 Programming to Monitor Channel Status
Ladder Programming Examples 5-9
COP Copy File Source Dest Length
#N10:0 #O:3.0 8
0001
0002
Channel 0 Enable
I:3.8
11
Channel 1 Enable
I:3.9
11
Channel 0 Broken Input
I:3.8
13
Channel 0 Out of Range
I:3.8
14
Channel 0 Configuration Error
I:3.8
15
Channel 1 Broken Input
I:3.9
13
Channel 1 Out of Range
I:3.9
Channel 0 Alarm
O:2
0
1746-O*16
Channel 1 Alarm
O:2
1
1746-O*16
14
Channel 1 Configuration Error
I:3.9
15
Publication 1746-UM003A-EN-P
5-10 Ladder Programming Examples
Channel 7 Enable
0003
0004

Invoking Autocalibration

Channel 7
I:3.15
11
Broken Input
I:3.15
13
Channel 7 Out of Range
I:3.15
14
Channel 7 Calibration Error
I:3.15
15
Autocalibration occurs whenever:
Channel 7 Alarm
O:2
7
1746-O*16
END
power is provided to the module
a change is made to its input type, filter frequency, or excitation current
an operating channel is disabled and re-enabled using its enable bit
the periodic calibration bit is toggled from 1 (disable) to 0 (enable) and back
to 1 (disable)
Referring to the following ladder, you can command your module to perform an autocalibration cycle by toggling the periodic calibration bit (bit 15).
To maintain system accuracy we recommend that you periodically perform an autocalibration cycle, for example:
whenever an event occurs that greatly changes the internal temperature of
the control cabinet, such as opening or closing its door
at a convenient time when the system is not making product, such as during
a shift change.
Publication 1746-UM003A-EN-P
Ladder Programming Examples 5-11
ATTENTION
Several channel cycles are required to perform an autocalibration and it is important to remember that during autocalibration the module is not converting input data.
!!!!
Example
Example - Command the RTD module to perform an autocalibration of
ExampleExample channel 0. The RTD module is in slot 3. This example assumes that the periodic calibration bit (bit 15) is in the disabled state (set to 1).
Programming to Invoke Autocalibration
Rung 2:0
Rung 2:1
Channel 0 Flag
B3
] [
1
Condition for Autocalibration
I:1
] [
1
B3
[OSR]
O:3.0
(L)
15
Channel 0 Flag
B3
(U)
1
O:3.0
(U)
0
15
Channel 0 Flag
B3
(L)
1
Publication 1746-UM003A-EN-P
5-12 Ladder Programming Examples
Publication 1746-UM003A-EN-P
Chapter
6
Module Diagnostics and Troubleshooting
This chapter describes troubleshooting using the channel status LEDs as well as the module status LED. A troubleshooting flowchart is shown on page 6-6. It explains the types of conditions that might cause an error to be reported and gives suggestions on how to resolve the problem. Major topics include:
module operation vs. channel operation
power-up diagnostics
channel diagnostics
LED indicators
troubleshooting flowchart
replacement parts
contacting Allen-Bradley

Module Operation vs. Channel Operation

The RTD module performs operations at two levels:
module-level operations
channel-level operations
Module-level operations include functions such as power-up configuration and communication with the SLC processor.
Channel-level operations describe channel-related functions, such as data conversion and open-circuit or short-circuit (RTDs only) detection.
Internal diagnostics are performed at both levels of operation and any error conditions detected are immediately indicated by the module’s LEDs and status to the SLC processor.
1 Publication 1746-UM003A-EN-P
6-2 Module Diagnostics and Troubleshooting

Power-Up Diagnostics

Channel Diagnostics

At module power-up, a series of internal diagnostic self-tests is performed. The module status LED remains off during power-up. The channel LEDs are turned on until the self test has finished. If any diagnostic test fails, the module enters the module error state. If all tests pass, the module status LED is turned on and the channel status LED is turned on for the respective enabled channel. The module continuously scans all enabled channels and communicates with the SLC processor. During power- up, the RTD module does not communicate with the processor.
When a channel is enabled (bit 11 = 1), a diagnostic check is performed to see that the channel has been properly configured. In addition, the channel is tested for out-of-range, open-circuit, and short-circuit faults on every scan.
A failure of any channel diagnostic test causes the faulted channel status LED to blink. All channel faults are indicated in bits 13 through 15 of the channel’s status word. Channel faults are self-clearing (bits 13 and 14 of status word). Bit 15 is not cleared until the correct change is made to the channel configuration. The channel LED stops blinking and resumes steady illumination when the fault conditions are corrected.

LED Indicators

IMPORTANT
If you clear (0) a channel enable bit (11), all channel status information (including error information) is reset (0).
The RTD module has nine LEDs. Eight of these are channel status LEDs numbered to correspond to each of the RTD/resistance input channels and one is a module status LED.
Figure 6.1 LED Display
INPUT
CHANNEL ST ATUS
MODULE
RTD / resistance
0 4 1 2 3
5 6 7
Channel LEDs
Publication 1746-UM003A-EN-P
Module Diagnostics and Troubleshooting 6-3
The following tables explain the function of the channel status LEDs while the module status LED is turned on.
Table 6.1 Module Status Description
If Module Status LED is:
ON Proper Operation No action required. Off or Flashing Module Fault Cycle power. If condition persists,
Table 6.2 Channel Status Description
Indicated Condition: Corrective Action:
replace the module or call your local distributor or Rockwell Automation for assistance.

Error Codes

LED
Power-up
Ch 0-7 Status On On/Off
(1)
Module Operation (No Error)
(2)
Module Error Channel
Error
Off
(3)
Flashes
Mod. Status Off On Flashes/Off On
(1) Module is disabled during powerup. (2) Channel status LED is On if the respective channel is enabled and Off if the channel is disabled. (3) Error if channel is enabled.
I/O error codes are reported in word S:6 of the SLC processor status file. The format for the error codes in the status word (S:6) is shown in the illustration below. The characters denoted as XX in the illustration below represent the slot number (Hex) for the module. The characters denoted as YY represent the 2-digit hex code for the fault condition.
The error codes applicable to the RTD Module range from 50H to 5AH. Some of these are non-recoverable errors. For a description of the error codes, refer to SLC 500 and MicroLogix 1000 Instruction Set Reference Manual, publication 1747-6.15.
XXYY
XX - Chassis Slot Number (Hex)
YY - Error Code (Hex)
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6-4 Module Diagnostics and Troubleshooting

Channel Status LEDs (Green)

The channel LED is used to indicate channel status and related error information contained in the channel status word. This includes conditions such as:
normal operation
channel-related configuration errors
broken input circuit errors such as open- or short-circuit (RTDs only)
out-of-range errors
All channel errors are recoverable errors and after corrective action, normal operation resumes.
Invalid Channel Configuration
Whenever a channel’s configuration word is improperly defined, the channel LED blinks and bit 15 of the channel status word is set. Configuration errors occur for the following invalid combinations:
Input type is a 10 Copper RTD and the excitation current is set for 0.25
mA, which is not allowed.
Lead R Enable bits 14 and 15 are set to 11, which is invalid.
Broken Input select bits 6 and 7 are set to 11, which is invalid.
Data format bits are set to 11, and the lower limit user-set scale is equal to
the upper limit user-set scale and not equal to 0.
Open- and Short-Circuit Detection
An open- or short-circuit test is performed on all enabled channels on each scan. Whenever an open-circuit or short-circuit condition occurs (see possible causes listed below), the channel LED blinks and bit 13 of the channel status word is set.
Possible causes of an open or short circuit include:
The RTD or potentiometer may be broken.
An RTD or potentiometer wire may be loose or cut.
The RTD or potentiometer may not have been installed on the configured
channel.
The RTD may be internally shorted.
The RTD may be installed incorrectly.
Wrong RTD used for type/configuration selected.
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Module Diagnostics and Troubleshooting 6-5
If an open- or short-circuit is detected, the channel data word reflects input data as defined by the broken input configuration bits (6 and 7) in the channel configuration word.
Out-Of-Range Detection
Whenever the data received at the channel data word is out of the defined operating range, an over-range or under-range error is indicated and bit 14 of the channel status word is set.
IMPORTANT
There is no under-range error for a direct resistance input (default scaling).
For a review of the temperature range or resistance range limitations for your input device, refer to the temperature ranges provided in Chapter 5 or the user-specified range in configuration words 8 through 23 if proportional counts is used.
Possible causes of an out-of-range condition include:
The temperature is too hot or too cold for the RTD being used.
Wrong RTD used for type/configuration selected.
Bad potentiometer or RTD.
Signal input from either potentiometer or RTD is beyond the user-set
scaling range.

Module Status LED (Green)

The module status LED is used to indicate module-related diagnostic or operating errors. These non-recoverable errors may be detected at power-up or during module operation. Once in a module error state, the RTD module no longer communicates with the SLC processor. Channels are disabled and data words are cleared (0).
Failure of any diagnostic test places the module in a non-recoverable state. To exit this state, cycle power. If the power cycle does not work, then call your local distributor or Rockwell Automation for assistance.
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6-6 Module Diagnostics and Troubleshooting
Figure 6.2 Troubleshooting Flowchart
Check LEDs on module.
Module Status LED is off.
Module fault condition
Check to see that module is seated properly in chassis. Cycle power.
Module Status LED is on.
Normal module operation
End
Channel Status LED(s) is flashing.
Fault
condition
Check channel status word bits 13 to 15
Bit 15 set (1)
Channel Status LED is off.
Channel is not
Enable channel if desired by setting channel config. word (bit 11=1).
Configuration error. Check and correct the configuration word for this channel.
enabled.
Retry.
Channel Status LED is on.
Channel is enabled and working properly.
End
Is problem corrected?
Contact your local distributor or Rockwell Automation.
Publication 1746-UM003A-EN-P
Yes
No
End
Bit 14 set (1)
Bit 13 set (1)
Out-of-range error indicating that either an over-range or under-range condition exists. For all over-range, the input signal is greater than the high scale limit for the channel. For under-range, the input signal is less than the low scale limit for the channel.
A broken input error or short-circuit (RTD) condition is present. Check channel for open or loose connections (RTD and potentiometer inputs) and check channel for short-circuit condition (RTD only). Retry.
Yes
Is problem corrected?
No
Contact your local distributor or Rockwell Automation.
Module Diagnostics and Troubleshooting 6-7

Replacement Parts

Contacting Rockwell Automation

The RTD module has the following replaceable parts:
Table 6.3 Parts List
Part Part Number
Replacement Terminal Block 1746-RT35 Replacement Terminal Cover 1746-R13 Series C 1746-NR8 User Manual 1746-UM003A-EN-P
If you need to contact Rockwell Automation for assistance, please have the following information available when you call:
a clear statement of the problem including a description of what the system
is actually doing. Note and record the LED states; also, note input and output image words for the RTD module.
a list of things you have already tried to remedy the problem
processor type, 1746-NR8 series letter, and firmware (FRN) number. See
label on left side of processor.
hardware types in the system including I/O modules and chassis
fault code if the SLC processor is faulted
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6-8 Module Diagnostics and Troubleshooting
Publication 1746-UM003A-EN-P
Chapter
7
Application Examples
This chapter provides two application examples to help you use the RTD input module. They are defined as a:
basic example
supplementary example
The basic example builds on the configuration word programming provided in Chapter 5 to set up one channel for operation. The module operates in Class 1 mode for this sample. This setup is then used in a typical application to display temperature.
The supplementary example demonstrates how to perform a dynamic configuration of all eight channels. The example sets up an application that allows you to manually select whether the displayed RTD input data for any channel is expressed in °C or °F. The module operates in Class 3 operation in order to support the scaling and status.

Basic Example

SLC 5/04
The following illustration indicates the temperature of a bath on an LED display. The display requires binary coded decimal (BCD) data, so the program must convert the temperature reading from the RTD module to BCD before sending it to the display. This application displays the temperature in °F.
Figure 7.1 Device Configuration
1746-OB16
1746-NR8
LED Display (DC Sinking Inputs, BCD Format)
Platinum RTD
200
Bath

Channel Configuration

Configure the RTD channel with the following setup:
200 Platinum RTD
°F in whole degrees
zero data word in the event of an open or short circuit
28 Hz input filter
1.0 mA excitation current
1 Publication 1746-UM003A-EN-P
7-2 Application Examples
Table 7.1 Channel Configuration Worksheet (With Settings Established for Channel 0)
Bit Definitions:
Bits 0 through 3 Input Type Select 0000 = 100
0001 = 200 0010 = 500 0011 = 1000 0100 = 100 0101 = 200
Bits 4 and 5 Data Format Select
00 = engineering units, x1 01 = engineering units, x10
Pt. (385) Pt. (385) Pt. (385)
Pt. (385) Pt. (3916) Pt. (3916)
0110 = 500 0111 = 1000
1000 = 10
Pt. (3916)
Pt. (3916)
Cu (426)
1001 = 120Ω Ni (618) 1010 = 120Ω Ni (672)
1011 = 604
(3)
(4)
Ni-Fe (518)
(1)
(2)
1100 = 150 1101= 500 1110= 1000 1111= 3000
Potentiometer
Potentiometer
PotentiometerPotentiometer
10 = scaled-for-PID (0 to 16383) 11 = proportional counts (-32768 to
+32767) Bits 6 and 7 Broken Input Select 00 = zero 01 = upscale 10 = downscale 11 = lnvalid Bit 8 Temperature Units
0 = degrees Celsius 1 = degrees Fahrenheit
Select Bits 9 and 10 Filter Frequency Select 00 = 28 Hz 01 = 50/60 Hz 10 = 800 Hz 11 = 6400 Hz Bit 11 Channel Enable 0 = channel disabled 1 = channel enabled Bit 12 Excitation Current Select 0 = 1.0 mA 1 = 0.25 mA Bit 13 Cal. Disable 0 = enable 1 = disable Bits 14 and 15 Lead R. Disable 00 = disable 01 = periodic 10 = always
(1) Actual value at °C is 9.042Ω per SAMA standard RC21-4-1966. (2) Actual value at 0°C is 100 per DIN standard. (3) Values are in 0.1° /step or 0.1 /step for all resistance input types, except 150Ω. For the 150 resistance input type, the values are in 0.01Ω/step. (4) Values are in 1° /step or 1Ω /step for all resistance input types, except 150. For the 150 resistance input type, the values are in 0.1Ω/step.

Program Listing

Since a 7-segment LED display is used to display temperature, the temperature data must be converted to BCD. The 16-bit data word representing the temperature value is converted into BCD values by the program shown in the following illustration.
Publication 1746-UM003A-EN-P
Figure 7.2 Program to Convert F to BCD
Rung 2.0
Rung 2.1
First Pass Bit
S:1
] [
15
Convert the channel 0 data word (degrees F) to BCD values and write this to the LED display. If channel 0 is ever disabled, a zero is written to the display.
Application Examples 7-3
Initialize Channel 0 of RTD Module.
MOV
MOVE Source N10:0
Dest O:3.0
TOD
TO BCD Source I:3.0
Dest N7:0
(1)
MVM
MASKED MOVE Source N7:0 Mask 0FFF Dest O:2.0
address 15 data 0 address 15 data 0 N10:0 0000 1001 0001 0001

Supplementary Example

(1) The use of the masked move instruction with the OFFF mask allows you to use outputs 12, 13, 14, and 15
for other output devices in your system. The 7-segment display uses outputs 0 through 11.
Rung 2.2
END
Table 7.2 Data Table
Application Setup (Eight Channels °C or °F)
The following illustration shows how to display the temperature of several different RTDs at one annunciator panel. A selector switch (I:2/0) allows the operator to choose between displaying data in °C and °F. Each of the displays is a 4-digit, 7-segment LED display with the last digit representing tenths of a degree. The displays have dc-sinking inputs and use a BCD data format.
Publication 1746-UM003A-EN-P
7-4 Application Examples
Figure 7.3 Device Configuration for Displaying Many RTD Inputs
SLC 5/04
1746-NR8
Display Panel
1746-IB8
Ambient
.
(8) 1746-OB16
.
Bath
.
°
C
°
F
..
Chilled H2OSteam
. .
200
Ambient Temperature 604
Nickel/Iron (518)
Bath
Platinum
RTD (385)
Chilled H
O Pipe In
2
200 Platinum RTD (385)
Chilled H
1000
O Pipe Out
2
Platinum RTD (385)
Steamed Pipe Out
Steamed Pipe In
Ambient Temperature 604
Nickel/Iron (518)
Chilled H
Chilled H
O Pipe In
2
Platinum RTD (385)
200
O Pipe Out
2
Selector Switch (I:2/0)
Bath
200
Platinum RTD (385)
Platinum RTD (385)
1000
Steamed Pipe Out
Steamed Pipe In

Channel Configuration

(see completed worksheet on page 7-5)
Configuration setup for ambient RTD:
channels 0 and 4
604 Nickel/Iron (518)
display temperature to tenths of a degree Celsius or Fahrenheit
zero data word in the event of an open- or short-circuit
28 Hz input filter to provide 60 Hz line noise rejection
use 1.0 mA excitation current for RTD
scaling for -20°C to +60°C
Publication 1746-UM003A-EN-P
Application Examples 7-5
Configuration setup for bath RTD:
channels 1 and 5
200 Platinum RTD (385)
display temperature to tenths of a degree Celsius or Fahrenheit
zero data word in the event of an open- or short-circuit
28 Hz input filter to provide 60 Hz line noise rejection
use 1.0 mA excitation current for RTD
scaling for 0°C to +60°C
define upper and lower temperature limits
Configuration setup for steam RTD:
channels 2 and 6
1000 Platinum RTD (385)
display temperature to tenths of a degree Celsius or Fahrenheit
zero data word in the event of an open- or short-circuit
50/60 Hz input filter to provide 60 Hz line noise rejection
use 0.25 mA excitation current for RTD
scaling for -20°C to +200°C
Configuration setup for chilled H
O RTD:
2
channels 3 and 7
200 Platinum RTD (385)
display temperature to tenths of a degree Celsius or Fahrenheit
zero data word in the event of an open- or short-circuit
28 Hz input filter to provide 60 Hz line noise rejection
scaling for 0°C to +60°C
define upper and lower temperature limits
Table 7.3 Channel Configuration Worksheet (With Settings Established)
Bit Definitions:
Bits 0 through 3 Input Type Select 0000 = 100
0001 = 200 0010 = 500 0011 = 1000 0100 = 100 0101 = 200
Bits 4 and 5 Data Format Select
00 = engineering units, x1
Pt. (385) Pt. (385) Pt. (385)
Pt. (385) Pt. (3916) Pt. (3916)
01 = engineering units, x10 Bits 6 and 7 Broken Input Select 00 = zero 01 = upscale 10 = downscale 11 = Invalid Bit 8 Temperature Units
0 = degrees Celsius 1 = degrees Fahrenheit
Select Bits 9 and 10 Filter Frequency Select 00 = 10 Hz 01 = 50 Hz 10 = 60 Hz 11 = 250 Hz Bit 11 Channel Enable 0 = channel disabled 1 = channel enabled Bit 12 Excitation Current
0 = 1.0 mA 1 = 0.25 mA
Select Bit 13 Calibration Enable 0 = enable 1 = disabled Bits 14 and 15 Lead Res. Enable 00 = always 01 = periodic 10 = disable
(1) Actual value at 0 °C is 9.042Ω per SAMA standard RC21-4-1966. (2) Actual value at 0 °C is 100 per DIN standard.
(3) Values are in 0.1°/step or 0.1Ω/step for all resistance input types, except 150Ω. For the 150Ω resistance input type, the values are in 0.01/step. (4) Values are in 1°/step or 1 /step for all resistance input types, except 150. For the 150 resistance input type, the values are in 0.1 Ω/step.
0110 = 500 0111 = 1000
1000 = 10
Pt. (3916)
Pt. (3916)
Cu (427)
1001 = 120 Ni (618) 1010 = 120 Ni (617)
1011 = 604
(3)
(4)
Ni-Fe (518)
1100 = 150Potentiometer
(1)
(2)
1101= 500 1110= 1000 1111= 3000
Potentiometer
PotentiometerPotentiometer
10 = scaled-for-PID (0 to 16383) 11 = proportional counts (-32768 to +32767)
Publication 1746-UM003A-EN-P
7-6 Application Examples

Program Setup and Operation Summary

1.
1. The alarms section of the ladder program monitors for any out of range
1.1. condition.
2.
2. Set up two configuration words in memory for each channel, one for °C
2.2. and the other for °F. The following table shows the configuration word allocation summary.
Table 7.4 Configuration Word Allocation
Channel Configuration Word Allocation
°F °C
0N10:0N10:8 1N10:1N10:9 2 N10:2 N10:10 3 N10:3 N10:11 4 N10:4 N10:12 5 N10:5 N10:13 6 N10:6 N10:14 7 N10:7 N10:15
3.
3. When the position of the degrees selector switch changes, write the
3.3. appropriate channel configuration to the RTD module. Note that the use of the OSR instruction (one-shot rising) makes these configuration changes edge-triggered, that is, the RTD is reconfigured only when the selector switch changes position.
4.
4. Convert the individual RTD data words to BCD and send the data to the
4.4. respective LED displays.

Program Listing

The first two rungs of this program send the correct channel setup information to the RTD module based on the position of the degrees selector switch.
Publication 1746-UM003A-EN-P
Figure 7.4 Program to Display Data On LEDs
If the degrees selector switch is turned to the Fahrenheit position, set up all eight channels to read in degrees Fahrenheit.
Degrees Selector Switch - Fahrenheit
Rung 2.0
Rung 2.1
I:2.0
] [
0
If the degrees selector switch is turned to the Celsius position, set up all four channels to read in degrees Celsius.
Degrees Selector Switch - Celsius
I:2.0
]/[
0
B3
B3
OSR
0
OSR
1
Application Examples 7-7
COP
COPY FILE Source #N10:0 Dest #O:1.0 Length 8
COP
COPY FILE Source #N10:8 Dest #O:1.0 Length 8
Rung 2.2
Rung 2.3
Rung 2.4
Rung 2.5
TOD
TO BCD Source I:1.0
Dest O:3.0
TOD
TO BCD Source I:1.1
Dest O:4.0
TOD
TO BCD Source I:1.2
Dest O:5.0
TOD
TO BCD Source I:1.3
Dest O:6.0
Rung 2.6
TOD
TO BCD Source I:1.4
Dest O:7.0
Publication 1746-UM003A-EN-P
7-8 Application Examples
Rung 2.7
Rung 2.8
Rung 2.9
Rung 2.10
TOD
TO BCD Source I:1.5
Dest O:8.0
TOD
TO BCD Source I:1.6
Dest O:9.0
TOD
TO BCD Source I:1.7
Dest O:10.0
END
Table 7.5 Data Table
Address 15 14 13 12 11 10 9876543210
N10:0 0000110100001011 N10:1 0000110100001110 N10:2 0001110100000011 N10:3 0000110100001111 N10:4 0000110100001011 N10:5 0000110100001110 N10:6 0001110100000011 N10:7 0000110100001111 N10:8 0000110000001011 N10:9 0000110000000001 N10:10 0001110000000011 N10:11 0000110000000001 N10:12 0000110000001011 N10:13 0000110000000001 N10:14 0001110000000011 N10:15 0000110000000001
Publication 1746-UM003A-EN-P
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