Rockwell Automation 1769-IT6 User Manual
Compact I/O Thermocouple/mV Input
Module
Catalog Numbers
User Manual
1769-IT6
Important User Information
Solid state equipment has operational characteristics differing from those of electromechanical equipment. Safety Guidelines for the
Application, Installation and Maintenance of Solid State Controls (publication SGI-1.1
office or online at http://www.rockwellautomation.com/literature/
) describes some important differences between solid state equipment
and hard-wired electromechanical devices. Because of this difference, and also because of the wide variety of uses for solid state
equipment, all persons responsible for applying this equipment must satisfy themselves that each intended application of this equipment is
acceptable.
In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages resulting from the use or
application of this equipment.
The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many variables and requirements
associated with any particular installation, Rockwell Automation, Inc. cannot assume responsibility or liability for actual use based on the
examples and diagrams.
No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits, equipment, or software described in
this manual.
Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell Automation, Inc., is prohibited.
Throughout this manual, when necessary, we use notes to make you aware of safety considerations.
WARNING: Identifies information about practices or circumstances that can cause an explosion in a hazardous
environment, which may lead to personal injury or death, property damage, or economic loss.
ATTENTION: Identifies information about practices or circumstances that can lead to personal injury or death,
property damage, or economic loss. Attentions help you identify a hazard, avoid a hazard, and recognize the
consequence
available from your local Rockwell Automation sales
SHOCK HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that
dangerous voltage may be present.
BURN HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that
surfaces may reach dangerous temperatures.
IMPORTANT
Allen-Bradley, Ro ckwell Software, Roc kwell Automation, Compact I/O, MicroLo gix, CompactLogi x, RSLogix 500, RSLogix 5 000, RSNetWorx, and TechConnect are trademarks of Rockwell Automation, Inc.
Trademarks not belonging to Rockwell Automation are property of their respective companies.
Identifies information that is critical for successful application and understanding of the product.
Summary of Changes
We have added an Important statement about the placement of the 1769-IT6
module with regard to the Compact I/O power supplies on page 18
To help you find new and updated information in this release of the manual, we
have included change bars as shown to the right of this paragraph.
.
Rockwell Automation Publication 1769-UM004B-EN-P - March 2010 3
Summary of Changes
Notes:
4 Rockwell Automation Publication 1769-UM004B-EN-P - March 2010
Table of Contents
Preface
Who Should Use This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Conventions Used in This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Chapter 1
Overview
Quick Start for
Experienced Users
Installation and Wiring
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Thermocouple/mV Inputs and Ranges . . . . . . . . . . . . . . . . . . . . . . . . . 11
Data Formats. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Filter Frequencies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Hardware Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
General Diagnostic Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
System Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Module Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Module Field Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Chapter 2
Before You Begin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Required Tools and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
What You Need to Do. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Chapter 3
Compliance to European Union Directives. . . . . . . . . . . . . . . . . . . . . . . . . 23
EMC Directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Low Voltage Directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Power Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
General Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Hazardous Location Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Preventing Electrostatic Discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Removing Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Selecting a Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
System Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Minimum Spacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Panel Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
DIN Rail Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Replace a Single Module within a System . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Rockwell Automation Publication 1769-UM004B-EN-P - March 2010 5
Table of Contents
Module Data, Status, and
Channel Configuration
Field Wiring Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
System Wiring Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Terminal Door Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Removing and Replacing the Terminal Block . . . . . . . . . . . . . . . . . . . 32
Wire the Finger-safe Terminal Block . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Wire the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Cold Junction Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Chapter 4
Module Memory Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Accessing Input Image File Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Input Data File. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Input Data Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
General Status Bits (S0 through S7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Open-circuit Flag Bits (OC0 through OC7) . . . . . . . . . . . . . . . . . . . . 39
Over-range Flag Bits (O0 through O7) . . . . . . . . . . . . . . . . . . . . . . . . . 40
Under-range Flag Bits (U0 through U7) . . . . . . . . . . . . . . . . . . . . . . . . 40
Configuring Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Configuration Data File. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Channel Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Enabling or Disabling a Channel (bit 15) . . . . . . . . . . . . . . . . . . . . . . . 43
Selecting Data Formats (bits 14…12) . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Selecting Input Type (bits 11…8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Selecting Temperature Units (bit 7). . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Determining Open-circuit Response (bits 6 and 5) . . . . . . . . . . . . . . 46
Selecting Input Filter Frequency (bits 2…0) . . . . . . . . . . . . . . . . . . . . . 46
Selecting Enable/Disable Cyclic Calibration (word 6, bit 0) . . . . . . 50
Determining Effective Resolution and Range . . . . . . . . . . . . . . . . . . . . . . . 50
Determining Module Update Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Effects of Autocalibration on Module Update Time . . . . . . . . . . . . . 70
Calculating Module Update Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Impact of Autocalibration on Module Startup
During Mode Change. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Chapter 5
Diagnostics and
Troubleshooting
6 Rockwell Automation Publication 1769-UM004B-EN-P - March 2010
Safety Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Indicator Lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Stand Clear of Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Program Alteration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Safety Circuits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Module Operation versus Channel Operation . . . . . . . . . . . . . . . . . . . . . . 76
Power-up Diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Specifications
Two’s Complement Binary
Numbers
Table of Contents
Channel Diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Invalid Channel Configuration Detection . . . . . . . . . . . . . . . . . . . . . . 77
Over-range or Under-range Detection. . . . . . . . . . . . . . . . . . . . . . . . . . 77
Open-circuit Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Non-critical versus Critical Module Errors . . . . . . . . . . . . . . . . . . . . . . . . . 78
Module Error Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Module Error Field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Extended-error Information Field. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Error Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Module Inhibit Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Contacting Rockwell Automation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Appendix A
Accuracy versus Thermocouple Temperature and Filter Frequency . . . 87
Temperature Drift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Appendix B
Positive Decimal Values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Negative Decimal Values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Thermocouple Descriptions
Using Thermocouple Junctions
Module Configuration by Using
a MicroLogix 1500 System and
RSLogix 500 Software
Appendix C
International Temperature Scale of 1990 . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Type B Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Type E Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Type J Thermocouples. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Type K Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Type N Thermocouples. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Type R Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Type S Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
Type T Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Appendix D
Using a Grounded Junction Thermocouple. . . . . . . . . . . . . . . . . . . . . . . . 135
Using an Ungrounded (isolated) Junction Thermocouple . . . . . . . . . . 137
Using an Exposed Junction Thermocouple . . . . . . . . . . . . . . . . . . . . . . . . 137
Appendix E
Module Addressing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
1769-IT6 Configuration File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
Configuring the 1769-IT6 Module in a MicroLogix 1500 System . . . 141
Rockwell Automation Publication 1769-UM004B-EN-P - March 2010 7
Table of Contents
Appendix F
Configuring Your 1769-IT6
Module with the Generic Profile
Configuring I/O Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
Configuring a 1769-IT6 Thermocouple Module . . . . . . . . . . . . . . . . . . . 150
for CompactLogix Controllers in
RSLogix 5000 Software
Appendix G
Configuring Your 1769-IT6
Configuring the 1769-IT6 Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
Module in a Remote DeviceNet
System with a 1769-ADN
DeviceNet Adapter
Glossary
Index
8 Rockwell Automation Publication 1769-UM004B-EN-P - March 2010
Read this preface to familiarize yourself with the rest of the manual.
Preface
Who Should Use This Manual
Additional Resources
Use this manual if you are responsible for designing, installing, programming, or
troubleshooting control systems that use Allen-Bradley Compact I/O and/or
compatible controllers, such as MicroLogix 1500 or CompactLogix.
These documents contain additional information concerning related Rockwell
Automation products.
Resource Description
MicroLogix 1500 User Manual,
publication 1764-UM001
1769-ADN DeviceNet Adapter User Manual,
publication 1769-UM001
CompactLogix User Manual,
publication 1769-UM007
Programmable Controller Grounding and Wiring
Guidelines, publication 1770-4.1
A user manual containing information on how to
install, use, and program your MicroLogix 1500
controller
An overview of the Compact I/O system
A user manual that contains information on
installing, using, and programming
CompactLogix controllers
In-depth information on grounding and wiring
Allen-Bradley programmable controllers
You can view or download publications at
http://www.rockwellautomation.com/literature
. To order paper copies of
technical documentation, contact your local Rockwell Automation distributor or
sales representative.
Conventions Used in This Manual
These conventions are used throughout this manual:
• Bulleted lists (like this one) provide information not procedural steps.
• Numbered lists provide sequential steps or hierarchical information.
• Bold type is used for emphasis.
Rockwell Automation Publication 1769-UM004B-EN-P - March 2010 9
Preface
Notes:
10 Rockwell Automation Publication 1769-UM004B-EN-P - March 2010
Chapter
Overview
This chapter describes the 1769-IT6 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.
1
General Description
The 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.
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
Thermocouple
Ty pe
J -210…1200 °C -346…2192 °F
K -270…1370 °C -454…2498 °F
T -270…400 °C -454…752 °F
E -270…1000 °C -454…1832 °F
R 0…1768 °C 32…3214 °F
S 0…1768 °C 32…3214 °F
B 300…1820 °C 572…3308 °F
N -210…1300 °C -346…2372 °F
C 0…2315 °C 32…4199 °F
CJC Sensor 0…85 °C 32…185 °F
°C Temperature Range °F Temperature Range
A.
Millivolt Input Type Range
± 50 mV -50…50 mV
± 100 mV -100…100 mV
Rockwell Automation Publication 1769-UM004B-EN-P - March 2010 11
Chapter 1 Overview
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.
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 these six
different filter frequencies for each channel:
• 10 Hz
• 50 Hz
• 60 Hz
• 250 Hz
• 500 Hz
• 1000 Hz
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.
12 Rockwell Automation Publication 1769-UM004B-EN-P - March 2010
Figure 1 - Hardware Features
Overview Chapter 1
8a
10a
10
10b
1
11
11
OK
Thermocouple/mV
2a
DANGER
Do Not Remove RTB Under Power
Unless Area is Non-Hazardous
NC
CJC 0+
IN 0+
CJC 0-
IN 0-
IN 3+
IN 1+
IN 3-
IN 1-
IN 4+
IN 2+
IN 4-
IN 2-
IN 5+
CJC 1-
IN 5-
CJC 1+
NC
Ensure
Adjacent Bus Lever is
Unlatched/Latched Before/After
Removing/Inserting Module
1769-IT6
2b
3
5a
4
7a
7a
OK
Thermocouple/mV
9
7b
7b
8b
Item Description
1 Bus lever
2a Upper-panel mounting tab
2b Lower-panel mounting tab
3 Module status indicator
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
5b
6
Rockwell Automation Publication 1769-UM004B-EN-P - March 2010 13
Chapter 1 Overview
General Diagnostic Features
The module contains a diagnostic status indicator that helps you identify the
source of anomalies that may occur during powerup or during normal channel
operation. The status indicator indicates both status and power. Power-up and
channel diagnostics are explained in Chapter
Troubleshooting.
5, Diagnostics and
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.
System Operation
At powerup, the module performs a check of its internal circuits, memory, and
basic functions. During this time, the module status indicator remains off. If no
faults are found during power-up diagnostics, the module status indicator 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 38.
By 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.
14 Rockwell Automation Publication 1769-UM004B-EN-P - March 2010
Controller
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.
16-pin Backplane
Connector
Overview Chapter 1
18-pin Terminal Block
Module
Data
Module
Status
Module
Configuration
Data
1769 Bus
ASIC
+5V +15V GND -15V
+24V DC
24V GND
Opto--
couplers
(3)
Microprocessor
A/D
Converter
Isolated Power
Supply
Differential
8:1
Multiplexer
Circuits
Input
Protection
Circuitry
6 Differential
Thermocouple/mV
Inputs
CJC Sensors
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).
When configured for millivolt inputs, the module converts the analog values
directly into digital counts.
Rockwell Automation Publication 1769-UM004B-EN-P - March 2010 15
Chapter 1 Overview
Module Field Calibration
The module provides autocalibration, which compensates for offset and gain
drift of the A/D converter caused by a temperature change within the module.
An internal, high-precision, low drift voltage and system ground reference is used
for this purpose. The input module performs autocalibration when a channel is
initially enabled. In addition, you can program the module to perform a
calibration cycle once every 5 minutes. See Selecting Enable/Disable Cyclic
Calibration (word 6, bit 0) on page 50 for information on configuring the
module to perform periodic autocalibration.
16 Rockwell Automation Publication 1769-UM004B-EN-P - March 2010
Quick Start for Experienced Users
Chapter
2
Before You Begin
Required Tools and Equipment
This chapter can help you to get started using the 1769-IT6 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.
Have these 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 software)
What You Need to Do
This chapter covers this information.
1. Be sure that your 1769 system
to support your system configuration.
2. Attach and lock the module.
3. Wire the module.
4. Configure the module.
5. Go through the start-up procedure.
6. Monitor the module status to check if the module is operating correctly.
Rockwell Automation Publication 1769-UM004B-EN-P - March 2010 17
power supply has sufficient current output
Chapter 2 Quick Start for Experienced Users
Step 1
(1) The system power supply could be catalog number 1769-PA2, 1769-PB2, 1769-PA4, 1769-PB4, or the internal supply of the
MicroLogix 1500 packaged controller.
Be sure that your 1769 system power supply
output to support your system configuration.
(1)
has sufficient current
Reference
Chapter
3
(Installation and Wiring)
The module’s maximum current draw is:
• 100 mA for 5V DC.
• 40 mA for 24V DC.
Step 2 Attach and lock the module. Reference
Chapter
3
(Installation and Wiring)
TIP
IMPORTANT
The module can be panel or DIN rail mounted. Modules can be
assembled before or after mounting.
ATTENTION: Remove power before removing or inserting this module. If
you remove or insert a module with power applied, an electrical arc may
occur.
To reduce the effects of electrical noise, install the 1769-IT6 module at
least two slots away from Compact I/O 120/240V AC power supplies.
3
4
2
1
6
1
5
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) by using
your fingers or a small screwdriver.
5. Move the bus lever fully to the left (4) until it clicks to allow
communication between the controller and module.
18 Rockwell Automation Publication 1769-UM004B-EN-P - March 2010
Quick Start for Experienced Users Chapter 2
Be sure the bus lever is locked firmly in place.
ATTENTION: When attaching I/O modules, it is very important
that the bus connectors are securely locked together to be sure of
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).
IMPORTANT
Step 3 Wire the module. Reference
A 1769-ECR or 1769-ECL right or left end cap respectively must be
used to terminate the end of the 1769 communication bus.
Chapter
3
(Installation and Wiring)
Follow these guidelines when wiring the module:
General Guidelines
• Power and input wiring must be in accordance with Class I, Division 2
wiring methods, Article 501-4(b) of the National Electric Code, NFPA 70,
and in accordance with the authority having jurisdiction.
• Channels are isolated from one another by ±10V DC maximum.
• 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, be sure 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 Guidelines
• 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 be sure of 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.
Rockwell Automation Publication 1769-UM004B-EN-P - March 2010 19
Chapter 2 Quick Start for Experienced Users
• To be sure of 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 Guidelines
ATTENTION: The possibility exists that a grounded or exposed
thermocouple can become shorted to a potential greater than that of the
thermocouple itself. Due to possible shock hazard, take care when wiring
grounded or exposed thermocouples. See Appendix
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.
• Ground the shield drain wire at one end only. The preferred location is as
follows.
– For grounded thermocouples or millivolt sensors, this is at the sensor
end.
– For 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.
D, Using
Figure 2 - Terminal Connections with CJC Sensors
CJC 0+
CJC 0-
IN 3+
IN 3-
IN 4+
IN 4-
IN 5+
IN 5-
NC
NC
IN 0+
IN 0-
IN 1 +
IN 1-
IN 2+
IN 2-
CJC 1-
CJC 1+
20 Rockwell Automation Publication 1769-UM004B-EN-P - March 2010
Quick Start for Experienced Users Chapter 2
Step 4 Configure the module. Reference
Chapter 4
(Module Data, Status, and Channel
Configuration)
The configuration file is typically modified by 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
for more information.
Step 5 Go through the start-up 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.
3. Put the controller in Run mode.
on page 42
During a normal startup, the module status indicator turns on.
TIP
Step 6 Monitor the module status to check if the module is operating
correctly
If the module status indicator does not turn on, cycle power. If the
condition persists, contact your local distributor or Rockwell
Automation for assistance.
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.
Reference
Chapter
5
(Diagnostics and
Troubleshooting)
Rockwell Automation Publication 1769-UM004B-EN-P - March 2010 21
Chapter 2 Quick Start for Experienced Users
Notes:
22 Rockwell Automation Publication 1769-UM004B-EN-P - March 2010
Installation and Wiring
This chapter tells you how to:
• determine the power requirements for the modules.
• avoid electrostatic damage.
• install the module.
• wire the module’s terminal block.
• wire input devices.
Chapter
3
Compliance to European Union Directives
This product is approved for installation within the European Union and EEA
regions. It has been designed and tested to meet the following directives.
EMC Directive
The 1769-IT6 module is tested to meet Council Directive 89/336/EEC
Electromagnetic Compatibility (EMC) and the following standards, in whole or
in part, documented in a technical construction file:
• 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.
Low Voltage Directive
This product is tested to meet Council Directive 73/23/EEC Low Voltage, by
applying the safety requirements of EN 61131-2 Programmable Controllers,
Part 2 – Equipment Requirements and Tests.
For specific information required by EN61131-2, see the appropriate sections in
this publication, as well as the Industrial Automation, Wiring and Grounding
Guidelines for Noise Immunity, publication 1770-4.1.
Rockwell Automation Publication 1769-UM004B-EN-P - March 2010 23
Chapter 3 Installation and Wiring
Power Requirements
General Considerations
The module receives power through the bus interface from the 5/24V DC
system power supply. The maximum current drawn by the module is:
• 100 mA at 5V DC.
• 40 mA at 24V DC.
Compact I/O modules are suitable for use in an industrial environment when
installed in accordance with these instructions. Specifically, this equipment is
(1)
intended for use in clean, dry environments (Pollution Degree 2
circuits not exceeding Over Voltage Category II
(2)
(IEC 60664-1).
) and to
(3)
Hazardous Location Considerations
This equipment is suitable for use in Class I, Division 2, Groups A, B, C, D or
non-hazardous locations only. The following WARNING statement applies to
use in hazardous locations.
WARNING: 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 or the area is known to be non-hazardous.
• Do not connect or disconnect components unless power has been
switched off or the area is known to be non-hazardous.
• This product must be installed in an enclosure.
• All wiring must comply with N.E.C. article 501-4(b).
(1) Pollution Degree 2 is an environment where, normally, only non-conductive pollution occurs except that
occasionally a temporary conductivity caused by condensation shall be expected.
(2) Over Voltage Category II is the load level section of the electrical distribution system. At this level transient
voltages are controlled and do not exceed the impulse voltage capability of the product’s insulation.
(3) Pollution Degree 2 and Over Voltage Category II are International Electrotechnical Commission (IEC)
designations.
24 Rockwell Automation Publication 1769-UM004B-EN-P - March 2010
Preventing Electrostatic Discharge
ATTENTION: Electrostatic discharge can damage integrated circuits or
semiconductors if you touch analog I/O module bus connector pins or the
terminal block on the input module. Follow these guidelines when you
handle the module:
• Touch a grounded object to discharge static potential.
• Wear an approved wrist-strap grounding device.
• Do not touch the bus connector or connector pins.
• Do not touch circuit components inside the module.
• Use a static-safe work station, if available.
• Keep the module in its static-shield bag when it is not in use.
Removing Power
ATTENTION: Remove power before removing or inserting this module.
When you remove or insert a module with power applied, an electrical arc
may occur. An electrical arc can cause personal injury or property damage
by:
• sending an erroneous signal to your system’s field devices, causing
unintended machine motion.
• causing an explosion in a hazardous environment.
Electrical arcing causes excessive wear to contacts on both the module and
its mating connector and may lead to premature failure.
Installation and Wiring Chapter 3
Selecting a Location
Consider reducing noise and power supply distance when selecting a location.
Reducing Noise
Most applications require installation in an industrial enclosure to reduce the
effects of electrical interference. Analog inputs are highly susceptible to electrical
noise. Electrical noise coupled to the analog inputs will reduce the performance
(accuracy) of the module.
Group your modules to minimize adverse effects from radiated electrical noise
and heat. Consider the following conditions when selecting a location for the
analog module. Position the module:
• away from sources of electrical noise such as hard-contact switches, relays,
and AC motor drives.
• away from modules which generate significant radiated heat, such as the
1769-IA16 module. Refer to the module’s heat dissipation specification.
In addition, route shielded, twisted-pair analog input wiring away from any high
voltage I/O wiring.
Rockwell Automation Publication 1769-UM004B-EN-P - March 2010 25
Chapter 3 Installation and Wiring
MicroLogix 1500 Controller
with Integrated System
Power Supply
Power Supply Distance
You can install as many modules as your power supply can support. However, all
1769 I/O modules have a power supply distance ratings. The maximum I/O
module rating is eight, which means that a module may not be located more than
eight modules away from the system power supply.
Compact I/O
Compact I/O
Compact I/O
Compact I/O
Compact I/O
Compact I/O
Compact I/O
End Cap
Compact I/O
1
2345678
Adapter
I/O Communication
Compact I/O
Compact I/O
Compact I/O
1123432
OR
Power Supply Distance
End Cap
Compact I/O
Compact I/O
Compact I/O
System Power Supply
Power Supply Distance
26 Rockwell Automation Publication 1769-UM004B-EN-P - March 2010
Installation and Wiring Chapter 3
System Assembly
The module can be attached to the controller or an adjacent I/O module before
or after mounting. For mounting instructions, see Panel Mounting by Using the
Dimensional Template on page 29, or DIN Rail Mounting on page 29. To work
with a system that is already mounted, see Replace a Single Module within a
System on page 30.
Follow this procedure to assemble the Compact I/O system.
3
4
2
IMPORTANT
To reduce the effects of electrical noise, install the 1769-IT6 module at
least two slots away from the AC power supplies.
1
6
1
5
1. Disconnect power.
2. Check that the bus lever of the module to be installed is in the unlocked
(fully right) position.
TIP
If the module is being installed to the left of an existing module,
check that the right-side adjacent module’s bus lever is in the
unlocked (fully right) position.
3. Use the upper and lower tongue-and-groove slots (1) to secure the modules
together (or to a controller).
4. Move the module back along the tongue-and-groove slots until the bus
connectors (2) line up with each other.
5. Push the bus lever back slightly to clear the positioning tab (3) by using
your fingers or a small screwdriver.
6. To allow communication between the controller and module, move the
bus lever fully to the left (4) until it clicks.
Be sure it is locked firmly in place.
ATTENTION: When attaching I/O modules, it is very important
that the bus connectors are securely locked together to be sure of
proper electrical connection.
7. Attach an end cap terminator (5) to the last module in the system by using
the tongue-and-groove slots as before.
Rockwell Automation Publication 1769-UM004B-EN-P - March 2010 27
Chapter 3 Installation and Wiring
8. Lock the end cap bus terminator (6).
Mounting
IMPORTANT
ATTENTION: During panel or DIN rail mounting of all devices, be sure
that all debris (metal chips, wire strands) is kept from falling into the
module. Debris that falls into the module could cause damage at
powerup.
A 1769-ECR or 1769-ECL right or left end cap respectively must be
used to terminate the end of the bus.
Minimum Spacing
Maintain spacing from enclosure walls, wireways, adjacent equipment, and so
forth. Allow 50 mm (2 in.) of space on all sides for adequate ventilation, as shown
below.
Top
Side Side
Host Controller
Compact I/O
Compact I/O
Bottom
Compact I/O
Compact I/O
End Cap
Compact I/O
Panel Mounting
Mount the module to a panel by using two screws per module. Use M4 or #8
panhead screws. Mounting screws are required on every module.
28 Rockwell Automation Publication 1769-UM004B-EN-P - March 2010
Installation and Wiring Chapter 3
Panel Mounting by Using the Dimensional Template
For more than 2 modules: (number of modules-1) X 35 mm (1,38 in.).
Refer to host controller documentation for this dimension.
132
(5.197)
35
(1.38)
28.5
(1.12)
Important: All dimensions are in mm (inches).
Hole spacing tolerance: ±0.04 mm (0.016 in.).
Panel Mounting Procedure by Using Modules as a Template
The following procedure allows you to use the assembled modules as a template
for drilling holes in the panel. If you have sophisticated panel mounting
equipment, you can use the dimensional template provided on page 29
module mounting hole tolerance, it is important to follow these procedures.
1. On a clean work surface, assemble no more than three modules.
2. Using the assembled modules as a template, carefully mark the center of all
module-mounting holes on the panel.
3. Return the assembled modules to the clean work surface, including any
previously mounted modules.
4. Drill and tap the mounting holes for the recommended M4 or #8 screw.
5. Place the modules back on the panel, and check for proper hole alignment.
122.6±0.2
(4.826±0.008)
Compact I/O
Host Controller
Compact I/O
Compact I/O
Right End Cap
. Due to
6. Attach the modules to the panel by using the mounting screws.
TIP
7. Repeat steps 1…6
If mounting more modules, mount only the last one of this group
and put the others aside. This reduces remounting time during
drilling and tapping of the next group.
for any remaining modules.
DIN Rail Mounting
The module can be mounted by using either of these DIN rails:
• 35 x 7.5 mm (EN 50 022 - 35 x 7.5)
• 35 x 15 mm (EN 50 022 - 35 x 15)
Before mounting the module on a DIN rail, close the DIN rail latches. Press the
DIN rail mounting area of the module against the DIN rail. The latches will
momentarily open and lock into place.
Rockwell Automation Publication 1769-UM004B-EN-P - March 2010 29
Chapter 3 Installation and Wiring
Replace a Single Module within a System
The module can be replaced while the system is mounted to a panel (or DIN
rail). Follow these steps in order.
1. Remove power.
See the important note on page 27
2. On the module to be removed, remove the upper and lower mounting
screws from the module (or open the DIN latches with screwdriver).
3. Move the bus lever to the right to disconnect (unlock) the bus.
4. On the right-side adjacent module, move its bus lever to the right (unlock)
to disconnect it from the module to be removed.
5. Gently slide the disconnected module forward.
If you feel excessive resistance, check that the module has been
disconnected from the bus, and that both mounting screws have been
removed (or DIN latches opened).
TIP
6. Before installing the replacement module, be sure that the bus lever on the
module to be installed and on the right-side adjacent module or end cap
are in the unlocked (fully right) position.
It may be necessary to rock the module slightly from front to back
to remove it, or, in a panel-mounted system, to loosen the screws
of adjacent modules.
.
Field Wiring Connections
7. Slide the replacement module into the open slot.
8. Connect the modules together by locking (fully left) the bus levers on the
replacement module and the right-side adjacent module.
9. Replace the mounting screws (or snap the module onto the DIN rail).
Use these guidelines when making field wiring connections.
System Wiring Guidelines
Consider these guidelines when wiring your system:
General Guidelines
• Power and input wiring must be in accordance with Class 1, Division 2
wiring methods, Article 501-4(b) of the National Electric Code,
NFPA 70, and in accordance with the authority having jurisdiction.
• Channels are isolated from one another by ±10V DC maximum.
• Route field wiring away from any other wiring and 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.
30 Rockwell Automation Publication 1769-UM004B-EN-P - March 2010
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