Spectrum Controls 1769 User manual

User’s Manual Pub. 0300244-01 Rev. A
1769 6 Channel
Isolated Thermocouple/mV
Input Module
Catalog Number: 1769sc-IT6I

ii Compact™ IO Isolated Thermocouple Module
User’s Manual Pub. 0300244-01 Rev. A
Important Notes 1. Please read all the information in this owner’s guide before installing the
product.
2. The information in this owner's guide applies to hardware Series A and firmware
version 1.00 or later.
3. This guide assumes that the reader has a full working knowledge of the relevant
processor.
Notice
The products and services described in this owner's guide are useful in a wide variety of
applications. Therefore, the user and others responsible for applying the products and
services described herein are responsible for determining their acceptability for each
application. While efforts have been made to provide accurate information within this
owner's guide, Spectrum Controls assumes no responsibility for the accuracy,
completeness, or usefulness of the information herein.
Under no circumstances will Spectrum Controls be responsible or liable for any damages
or losses, including indirect or consequential damages or losses, arising out of either the
use of any information within this owner's guide or the use of any product or service
referenced herein.
No patent liability is assumed by Spectrum Controls with respect to the use of any of the
information, products, circuits, programming, or services referenced herein.
The information in this owner's guide is subject to change without notice.
Limited Warranty
Spectrum Controls warrants that its products are free from defects in material and
workmanship under normal use and service, as described in Spectrum Controls literature
covering this product, for a period of 1 year. The obligations of Spectrum Controls under
this warranty are limited to replacing or repairing, at its option, at its factory or facility,
any product which shall, in the applicable period after shipment, be returned to the
Spectrum Controls facility, transportation charges prepaid, and which after examination
is determined, to the satisfaction of Spectrum Controls, to be thus defective.
This warranty shall not apply to any such equipment which shall have been repaired or
altered except by Spectrum Controls or which shall have been subject to misuse, neglect,
or accident. In no case shall the liability of Spectrum Controls exceed the purchase price.
The aforementioned provisions do not extend the original warranty period of any product
which has either been repaired or replaced by Spectrum Controls.

User’s Manual Pub. 0300244-01 Rev. A
Table of Contents
IMPORTANT NOTES ............................................................................................................................................... II
NOTICE .................................................................................................................................................................. II
LIMITED WARRANTY.............................................................................................................................................. II
PREFACE ..............................................................................................................................................................VII
CHAPTER 1 OVERVIEW........................................................................................................................................ 1-1
SECTION 1.1 GENERAL DESCRIPTION.............................................................................................................................. 1-1
1.1.1 Thermocouple/mV Inputs and Ranges ..................................................................................................... 1-1
1.1.2 Data Formats ........................................................................................................................................... 1-2
1.1.3 Filter Frequencies ..................................................................................................................................... 1-2
1.1.4 Hardware Features................................................................................................................................... 1-2
1.1.5 General Diagnostic Features .................................................................................................................... 1-3
SECTION 1.2 SYSTEM OVERVIEW................................................................................................................................... 1-3
1.2.1 System Operation..................................................................................................................................... 1-4
1.2.2 Module Operation .................................................................................................................................... 1-4
CHAPTER 2 QUICK START FOR EXPERIENCED USERS ........................................................................................... 2-1
SECTION 2.1 BEFORE YOU BEGIN .................................................................................................................................. 2-1
SECTION 2.2 REQUIRED TOOLS AND EQUIPMENT ............................................................................................................. 2-1
SECTION 2.3 WHAT YOU NEED TO DO........................................................................................................................... 2-2
CHAPTER 3 INSTALLATION AND WIRING............................................................................................................. 3-1
SECTION 3.1 COMPLIANCE TO EUROPEAN UNION DIRECTIVES............................................................................................. 3-1
3.1.1 EMC Directive ........................................................................................................................................... 3-1
3.1.2 Low Voltage Directive .............................................................................................................................. 3-1
SECTION 3.2 POWER REQUIREMENTS............................................................................................................................. 3-2
SECTION 3.3 GENERAL CONSIDERATIONS ........................................................................................................................ 3-2
3.3.1 Hazardous Location Considerations ......................................................................................................... 3-2
3.3.2 Prevent Electrical Discharge..................................................................................................................... 3-3
3.3.3 Remove Power.......................................................................................................................................... 3-3
3.3.4 Selecting a Location ................................................................................................................................. 3-3
SECTION 3.4 SYSTEM ASSEMBLY ................................................................................................................................... 3-4
SECTION 3.5 MOUNTING............................................................................................................................................. 3-5
3.5.1 Minimum Spacing..................................................................................................................................... 3-5
3.5.2 Panel Mounting........................................................................................................................................ 3-6
3.5.3 DIN Rail Mounting.................................................................................................................................... 3-7
SECTION 3.6 REPLACING A SINGLE MODULE WITHIN A SYSTEM ........................................................................................... 3-7
SECTION 3.7 FIELD WIRING CONNECTIONS ..................................................................................................................... 3-8
3.7.1 System Wiring Guidelines......................................................................................................................... 3-8
3.7.2 Terminal Door Label ................................................................................................................................. 3-9
3.7.3 Removing and Replacing the Terminal Block ........................................................................................... 3-9
3.7.4 Wiring the Finger Safe Terminal Block ................................................................................................... 3-10
3.7.5 Wiring the Module ................................................................................................................................. 3-11

iv Compact™ IO Isolated Thermocouple Module
User’s Manual Pub. 0300244-01 Rev. A
SECTION 3.8 COLD JUNCTION COMPENSATION .............................................................................................................. 3-12
SECTION 3.9 CALIBRATION......................................................................................................................................... 3-13
CHAPTER 4 MODULE DATA, STATUS, AND CHANNEL CONFIGURATION ..............................................................4-1
SECTION 4.1 MODULE MEMORY MAP ........................................................................................................................... 4-1
SECTION 4.2 CONFIGURING CHANNELS........................................................................................................................... 4-2
4.2.1 Configuration Data File ............................................................................................................................ 4-2
4.2.2 Channel Configuration ............................................................................................................................. 4-3
UNUSED ................................................................................................................................................................. 4-3
CHANNEL DISPLAY ................................................................................................................................................ 4-3
4.2.3 Enabling or Disabling a Channel (Bit 15).................................................................................................. 4-3
4.2.4 Selecting Data Formats (Bits 12 through 14) ........................................................................................... 4-4
DATA FORMAT....................................................................................................................................................... 4-4
Raw/Proportional Data................................................................................................................................................... 4-4
Engineering Units x1 ....................................................................................................................................................... 4-5
Engineering Units x10 ..................................................................................................................................................... 4-5
Scaled for PID.................................................................................................................................................................. 4-5
Percent Range................................................................................................................................................................. 4-5
4.2.5 Selecting Input Type (Bits 8 through 11) .................................................................................................. 4-5
4.2.6 Selecting Temperature Units (Bit 7) ......................................................................................................... 4-5
4.2.7 Determining Open-Circuit Response (Bits 6 and 5) .................................................................................. 4-6
4.2.8 Display CJC Data (Bit 4) ............................................................................................................................ 4-6
4.2.9 Selecting Input Filter Frequency (Bits 0 through 2) .................................................................................. 4-6
Effects of Filter Frequency on Noise Rejection ............................................................................................................... 4-7
Cut-Off Frequency........................................................................................................................................................... 4-7
Repeatability................................................................................................................................................................... 4-8
Module Update Time...................................................................................................................................................... 4-8
SECTION 4.3 INPUT IMAGE FILE .................................................................................................................................... 4-9
SECTION 4.4 INPUT DATA FILE.................................................................................................................................... 4-10
4.4.1 Input Data Values................................................................................................................................... 4-10
4.4.2 General Status Bits (S0 to S7) ................................................................................................................. 4-10
4.4.3 Open-Circuit Flag Bits (OC0 to OC7) ....................................................................................................... 4-11
4.4.4 Over-Range Flag Bits (O0 to O7) ............................................................................................................ 4-11
4.4.5 Under Range Flag Bits (U0 to U7) .......................................................................................................... 4-11
CHAPTER 5 DIAGNOSTICS AND TROUBLESHOOTING........................................................................................... 5-1
SECTION 5.1 SAFETY CONSIDERATIONS .......................................................................................................................... 5-1
5.1.1 Indicator Lights......................................................................................................................................... 5-1
5.1.2 Stand Clear of Equipment......................................................................................................................... 5-1
5.1.3 Program Alteration .................................................................................................................................. 5-1
5.1.4 Safety Circuits........................................................................................................................................... 5-1
SECTION 5.2 MODULE OPERATION VS.CHANNEL OPERATION............................................................................................ 5-2
SECTION 5.3 POWER-UP DIAGNOSTICS .......................................................................................................................... 5-2
SECTION 5.4 CHANNEL DIAGNOSTICS ............................................................................................................................. 5-2
5.4.1 Invalid Channel Configuration Detection ................................................................................................. 5-2
5.4.2 Over or Under Range Detection ............................................................................................................... 5-3
5.4.3 Open Circuit Detection ............................................................................................................................. 5-3

Table of Contents v
User’s Manual Pub. 0300244-01 Rev. A
SECTION 5.5 NON-CRITICAL VS.CRITICAL MODULE ERRORS ............................................................................................... 5-3
SECTION 5.6 MODULE ERROR DEFINITION TABLE ............................................................................................................. 5-4
5.6.1 Module Error Field.................................................................................................................................... 5-4
5.6.2 Extended Error Information Field ............................................................................................................. 5-4
SECTION 5.7 ERROR CODES.......................................................................................................................................... 5-5
SECTION 5.8 MODULE INHIBIT FUNCTION ....................................................................................................................... 5-6
APPENDIX A SPECIFICATIONS..............................................................................................................................A-1
APPENDIX B USING THERMOCOUPLE JUNCTIONS...............................................................................................B-1
SECTION B.1 USING A GROUNDED JUNCTION THERMOCOUPLE ........................................................................................... B-1
SECTION B.2 USING AN UNGROUNDED (ISOLATED)JUNCTION THERMOCOUPLE ..................................................................... B-2
SECTION B.3 USING AN EXPOSED JUNCTION THERMOCOUPLE............................................................................................. B-3
APPENDIX C MODULE CONFIGURATION USING MICROLOGIX 1500 AND RSLOGIX 500 .......................................C-1
SECTION C.1 MODULE ADDRESSING .............................................................................................................................. C-1
C.1.1 1769sc-IT6I Configuration File.................................................................................................................. C-2
SECTION C.2 CONFIGURING THE 1769SC-IT6I IN A MICROLOGIX 1500 SYSTEM.................................................................... C-2
APPENDIX D CONFIGURING THE IT6I FOR COMPACTLOGIX CONTROLLERS IN RSLOGIX 5000............................. D-1
SECTION D.3 CONFIGURING I/O MODULES.....................................................................................................................D-4
SECTION D.4 CONFIGURING A 1769SC-IT6I ISOLATED THERMOCOUPLE MODULE ..................................................................D-5
APPENDIX E CONFIGURING THE IT6I TO BE USED WITH A 1769-ADN DEVICENET ADAPTER ............................... E-1
SECTION E.5 CONFIGURING THE 1769SC-IT6I................................................................................................................. E-3

vi Compact™ IO Isolated Thermocouple Module
User’s Manual Pub. 0300244-01 Rev. A

User’s Manual Pub. 0300244-01 Rev. A
Preface
Read this preface to familiarize yourself with the rest of the manual. This preface covers
the following topics:
•Who should use this manual
•How to use this manual
•Related publications
•Conventions used in this manual
•Rockwell Automation support
Who Should
Use This Manual Use this manual if you are responsible for designing, installing, programming, or
troubleshooting control systems that use Allen-Bradley I/O and/or compatible controllers,
such as the MicroLogix 1500 and the CompactLogix system.
How to Use
This Manual As much as possible, we organized this manual to explain, in a task-by-task manner, how
to install, configure, program, operate and troubleshoot a control system using the
1769sc-IT6I.
Related
Documentation The table below provides a listing of publications that contain important information
about Allen-Bradley PLC systems.
Document Title Document Number
MicroLogix™ 1500 User Manual 1764-UM001A-US-P
1769 Compact Discrete Input/Output Modules
Product Data
1769-2.1
MicroLogix™ 1500 System Overview 1764-SO001B-EN-P
Compact™ I/O System Overview 1769-SO001A-EN-P
CompactLogix User Manual 1769-UM007B-EN-P
Allen-Bradley Programmable Controller
Grounding and Wiring Guidelines
1770-4.1

viii Compact™ IO Isolated Thermocouple Module
User’s Manual Pub. 0300244-01 Rev. A
Conventions
Used in This
Manual The following conventions are used throughout this manual:
•Bulleted lists (like this one) provide information not procedural steps.
•Numbered lists provide sequential steps or hierarchical information.
•Italic type is used for emphasis
•Bold type identifies headings and sub-headings
Are used to identify critical information to the reader
!
Attention

User’s Manual Pub. 0300244-01 Rev. A
Chapter 1
Overview
This chapter describes the 1769sc-IT6I Isolated Thermocouple/mV Input Module and
explains how the module reads thermocouple or millivolt analog input data. Included is
information about:
•The module’s hardware and diagnostic features
•An overview of system and module operation
•Compatibility
Section 1.1
General
Description The isolated thermocouple/mV input module supports thermocouple and millivolt signal
measurement. It digitally converts and stores thermocouple and/or millivolt analog data
from any combination of up to six thermocouple or millivolt analog sensors. Each input
channel is individually configurable via software for a specific input device, data format
and filter frequency, and provides open-circuit, over-range and under-range detection and
indication.
1.1.1 Thermocouple/mV Inputs and Ranges
The table below defines thermocouple types and their associated full-scale temperature
ranges. The second table lists the millivolt analog input signal ranges that each channel
will support. To determine the practical temperature range your thermocouple supports,
see the specifications in Appendix A.
Thermocouple Type
Temperature Range (°C) Temperature Range (°F)
J -210 to 1200 -346 to 2192
K -270 to 1370 -454 to 2498
T -270 to 400 -454 to 752
E -270 to 1000 -454 to 1832
R 0 to 1768 32 to 3214
S 0 to 1768 32 to 3214
B 300 to 1820 572 to 3308
N -210 to 1300 -346 to 2372
C 0 to 2315 32 to 4199
L -200 to 900 -328 to 1652
Millivolt Input Type Range
± 50mV -50 to 50 mV
± 100mV -100 to 100 mV

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User’s Manual Pub. 0300244-01 Rev. A
1.1.2 Data Formats
The data can be configured on board each module as:
•Engineering units x 1
•Engineering units x 10
•Scaled-for-PID
•Percent of full-scale
•Raw/proportional data
1.1.3 Filter Frequencies
The module uses a digital filter that provides high frequency noise rejection for the input
signals. The filter is programmable, allowing you to select from six different filter
frequencies for each channel:
•4.17 Hz
•10 Hz
•16.7 Hz
•19.6 Hz
•62 Hz
•470 Hz
1.1.4 Hardware Features
The module contains a removable terminal block. Channels are wired as differential
inputs. Two cold junction compensation (CJC) sensors are attached to the terminal block
to enable accurate readings from each channel. These sensors compensate for offset
voltages introduced into the input signal as a result of the cold-junction where the
thermocouple wires are connected to the module.
Module configuration is normally done via the controller’s programming software. In
addition, some controllers support configuration via the user program. In either case, the
module configuration is stored in the memory of the controller. Refer to your controller’s
user manual for more information.

Chapter 1: Module Overview 1-3
User’s Manual Pub. 0300244-01 Rev. A
The illustration below shows the module’s hardware features.
Item Description
1 Bus lever
2a Upper panel mounting tab
2b Lower panel mounting tab
3 Module status LED
4 Module door with terminal identification label
5a Movable bus connector (bus interface) with female pins
5b Stationary bus connector (bus interface) with male pins
6 Nameplate label
7a Upper tongue-and-groove slots
7b Lower tongue-and-groove slots
8a Upper DIN rail latch
8b Lower DIN rail latch
9 Write-on label for user identification tags
10 Removable terminal block (RTB) with finger-safe cover
10a RTB upper retaining screw
10b RTB lower retaining screw
11 CJC sensors
1.1.5 General Diagnostic Features
The module contains a diagnostic LED that helps you identify the source of problems that
may occur during power-up or during normal channel operation. The LED indicates both
status and power. Power-up and channel diagnostics are explained in Chapter 5,
Diagnostics and Troubleshooting.
Section 1.2
System Overview The modules communicate to the controller through the bus interface. The modules also
receive 5 and 24V dc power through the bus interface.

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1.2.1 System Operation
At power-up, the module performs a check of its internal circuits, memory, and basic
functions. During this time, the module status LED remains off. If no faults are found
during power-up diagnostics, the module status LED is turned on.
After power-up checks are complete, the module waits for valid channel configuration
data. If an invalid configuration is detected, the module generates a configuration error.
Once a channel is properly configured and enabled, it continuously converts the
thermocouple or millivolt input to a value within the range selected for that channel.
Each time a channel is read by the input module, that data value is tested by the module
for an over-range, under-range, open-circuit, or “input data not valid” condition. If such
a condition is detected, a unique bit is set in the channel status word. The channel status
word is described in Input Data File on page 4-10.
Using the module image table, the controller reads the two’s complement binary
converted thermocouple or millivolt data from the module. This typically occurs at the
end of the program scan or when commanded by the control program. If the controller
and the module determine that the data transfer has been made without error, the data is
used in the control program.
1.2.2 Module Operation
When the module receives a differential input from an analog device, the module’s
circuitry multiplexes the input into an A/D converter. The converter reads the signal and
converts it as required for the type of input. The module also continuously samples the
CJC sensors and compensates for temperature changes at the terminal block cold
junction, between the thermocouple wire and the input channel. See the block diagram
below.
Each channel can receive input signals from a thermocouple or millivolt analog input
device, depending upon how you configured the channel.
When configured for thermocouple input types, the module converts the analog input
voltages into cold-junction compensated and linearized digital temperature readings. The
module uses the National Institute of Standards and Technology (NIST) ITS-90 standard
for linearization for all thermocouple types (J, K, T, E, R, S, B, N, C, L).

Chapter 1: Module Overview 1-5
User’s Manual Pub. 0300244-01 Rev. A
When configured for millivolt inputs, the module converts the analog values directly into
digital counts.

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User’s Manual Pub. 0300244-01 Rev. A
Chapter 2
Quick Start for
Experienced Users
Section 2.1
Before You
Begin This chapter can help you to get started using the 1769sc-IT6I Isolated
Thermocouple/mV Input Module. We base the procedures here on the assumption that
you have an understanding of Allen-Bradley controllers. You should understand
electronic process control and be able to interpret the ladder logic instructions required to
generate the electronic signals that control your application.
Because it is a start-up guide for experienced users, this chapter does not contain detailed
explanations about the procedures listed. It does, however, reference other chapters in
this book where you can get more information about applying the procedures described in
each step.
If you have any questions or are unfamiliar with the terms used or concepts presented in
the procedural steps, always read the referenced chapters and other recommended
documentation before trying to apply the information.
Section 2.2
Required Tools
and Equipment Have the following tools and equipment ready:
•Medium blade or cross-head screwdriver
•Thermocouple or millivolt analog input device
•Shielded, twisted-pair cable for wiring (Belden™ 8761 or equivalent for
millivolt inputs, or shielded thermocouple extension wire for thermocouple
inputs)
•Controller (for example, a MicroLogix™ 1500 or CompactLogix™ controller)
•Programming device and software (for example, RSLogix 500™ or RSLogix
5000™)

2-2 Compact™ IO Isolated Thermocouple Module
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Section 2.3
What You
Need To Do This chapter covers:
1) Ensuring that your power supply is adequate
2) Attaching and locking the module
3) Wiring the module
4) Configuring the module
5) Going through the startup procedure
6) Monitoring module operation
Step 1: Ensure that your 1769 system
power supply1has sufficient current
output to support your system
configuration.
Reference
Chapter 3
(Installation and Wiring)
The module’s maximum current draw is shown below.
5V dc 24V dc
150 mA 35 mA
Note: The module cannot be located more than 8 modules away from the system power
supply.
Step 2: Attach and lock the module. Reference
Chapter 3
(Installation and Wiring)
Note: The module can be panel or DIN rail mounted. Modules can be assembled
before or after mounting.
Remove power before removing or inserting this module. If you remove
or insert a module with power applied, an electrical arc may occur.
1The system power supply could be a 1769-PA2, -PB2, -PA4, -PB4, or the internal supply of the MicroLogix 1500
packaged controller.
!
Attention

Chapter 2: Quick Start for Experienced Users 2-3
User’s Manual Pub. 0300244-01 Rev. A
1) Check that the bus lever of the module to be installed is in the unlocked (fully
right) position.
2) Use the upper and lower tongue-and-groove slots (1) to secure the modules
together (or to a controller).
3) Move the module back along the tongue-and-groove slots until the bus
connectors (2) line up with each other.
4) Push the bus lever back slightly to clear the positioning tab (3). Use your fingers
or a small screwdriver.
5) To allow communication between the controller and module, move the bus lever
fully to the left (4) until it clicks. Ensure it is locked firmly in place.
When attaching I/O modules, it is very important that the bus
connectors are securely locked together to ensure proper electrical
connection.
6) Attach an end cap terminator (5) to the last module in the system by using the
tongue-and-groove slots as before.
7) Lock the end cap bus terminator (6).
A 1769-ECR or 1769-ECL right or left end cap respectively must be
used to terminate the end of the 1769 communication bus.
Step 3: Wire the module. Reference
Chapter 3
(Installation and Wiring)
!
Attention
!
Attention

2-4 Compact™ IO Isolated Thermocouple Module
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Follow the guidelines below when wiring the module.
General
•Power and input wiring must be in accordance with Class 1, Division 2 wiring
methods, Article 501-4(b) of the National Electric Code, NFPA 70, and in
accordance with the authority having jurisdiction.
•Channels are isolated from one another by 500V dc maximum.
•Route field wiring away from any other wiring and keep it as far as possible
from sources of electrical noise, such as motors, transformers, contactors, and ac
devices. As a general rule, allow at least 15.2 cm (6 in.) of separation for every
120V of power.
•Routing field wiring in a grounded conduit can reduce electrical noise.
•If field wiring must cross ac or power cables, ensure that they cross at right
angles.
•If multiple power supplies are used with analog millivolt inputs, the power
supply commons must be connected.
Terminal Block
•Do not use the module’s NC terminals as connection points.
•Do not tamper with or remove the CJC sensors on the terminal block. Removal
of either one or both sensors will reduce accuracy.
•For millivolt sensors, use Belden 8761 shielded twisted-pair wire (or equivalent)
to ensure proper operation and high immunity to electrical noise.
•For a thermocouple, use the shielded, twisted-pair thermocouple extension lead
wires specified by the thermocouple manufacturer. Using the incorrect type of
thermocouple extension wire or not following the correct polarity will cause
invalid readings.
•To ensure optimum accuracy, limit overall cable impedance by keeping a cable
as short as possible. Locate the module as close to input devices as the
application permits.
Grounding
The possibility exists that a grounded or exposed thermocouple can
become shorted to a potential greater than that of the thermocouple
itself. Due to possible shock hazard, take care when wiring grounded or
exposed thermocouples. See Appendix B, Using Thermocouple
Junctions.
•This product is intended to be mounted to a well-grounded mounting surface
such as a metal panel. Additional grounding connections from the module’s
mounting tabs or DIN rail (if used) are not required unless the mounting surface
cannot be grounded.
•Keep cable shield connections to ground as short as possible.
!
Attention

Chapter 2: Quick Start for Experienced Users 2-5
User’s Manual Pub. 0300244-01 Rev. A
•Ground the shield drain wire at one end only. The preferred location is as
follows.
oFor grounded thermocouples or millivolt sensors, this is at the sensor
end.
oFor insulated/ungrounded thermocouples, this is at the module end.
Contact your sensor manufacturer for additional details.
•Refer to Industrial Automation Wiring and Grounding Guidelines, Allen-
Bradley publication 1770-4.1, for additional information.
The terminal connections with CJC sensors are shown below:
Step 4: Configure the module. Reference
Chapter 4
(Module Data, Status, and
Channel Configuration)
The configuration file is typically modified using the programming software compatible
with your controller. It can also be modified through the control program, if supported
by the controller. See Channel Configuration on page 4-3 for more information.
Step 5: Go through the startup
procedure. Reference
Chapter 5(Diagnostics and
Troubleshooting)
1) Apply power to the controller system.
2) Download your program, which contains the thermocouple module
configuration settings, to the controller.

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3) Put the controller in Run mode. During a normal start-up, the module status
LED turns on.
Note: If the module status LED does not turn on, cycle power. If the condition
persists, contact your local distributor or Spectrum Controls for assistance.
Step 6: Monitor the module status to
check if the module is operating
correctly
Reference
Chapter 5(Diagnostics and
Troubleshooting)
Module and channel configuration errors are reported to the controller. These errors are
typically reported in the controller’s I/O status file.
Channel status data is also reported in the module’s input data table, so these bits can be
used in your control program to flag a channel error.