Spectrum Controls 1769sc-IF8u User Manual

Owner’s Guide 0300198-03 Rev. B

COMPACT™ I/O

UNIVERSAL

ANALOG INPUT MODULE

Catalog Number: 1769sc-IF8u

Important Notes	1. Please read all the information in this owner’s guide before installing
	the product.
	2. The information in this owner's guide applies to hardware Series A and
	firmware version 1.0 or later.
	3. This guide assumes that the reader has a full working knowledge of the
	relevant processor.
	Notice
	The products and services described in this owner's guide are useful in a
	wide variety of applications. 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.
	LimitedWarranty
	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.

Table of Contents

Preface ix

Chapter 1 Module Overview 1

Chapter 2

Quick Start

for Experienced Users 9

Chapter 3

Installation and

Wiring 17

Who Should Use This
Manual .....................................................................................................................	ix
How to Use This Manual ........................................................................................	ix
Related Documentation ...........................................................................................	ix
Conventions Used in
This Manual .............................................................................................................	x

General Description ..................................................................................................	1
Input Types and Ranges ..........................................................................................	1
Data Formats ............................................................................................................	2
Filter Frequencies .....................................................................................................	2
Hardware Features ....................................................................................................	3
System Overview ......................................................................................................	4
Module Operation ....................................................................................................	5
Module Field Calibration ..........................................................................................	7

Before You Begin ......................................................................................................	9
Required Tools and
Equipment .................................................................................................................	9
What You Need To Do .............................................................................................	9

Compliance to European
Union Directives .....................................................................................................	17
Power Requirements ...............................................................................................	18
General Considerations ..........................................................................................	18
System Assembly ...................................................................................................	20
Mounting ................................................................................................................	22
Replacing a Single
Module within a System .........................................................................................	24
Field Wiring
Connections
System Wiring Guidelines ......................................................................................	25
Cold Junction
Compensation .........................................................................................................	30

vi	Compact IO™ Universal Input Module

Chapter 4

Module Data, Status,

and Channel

Configuration 33

Chapter 5 Diagnostics and Troubleshooting 57

Appendix A 1769sc-IF8U Specifications 65

Appendix B

Two’s Complement

Binary

Numbers 69

Appendix C

Thermocouple

Descriptions 73

Module Memory Map ............................................................................................	33
Accessing Input Image File Data ...........................................................................	34
Input Data File ........................................................................................................	34
Module Configuration ............................................................................................	36
Determining Effective Resolution and Range ........................................................	50
Determining Module Update Time .........................................................................	52

Safety Considerations ............................................................................................	57
Module Operation vs. Channel Operation .............................................................	58
Power-up Diagnostics ............................................................................................	58
Channel Diagnostics ..............................................................................................	59
Non-critical vs. Critical Module Errors ...................................................................	60
Module Error Definition Table ...............................................................................	61
Error Codes .............................................................................................................	62
Module Inhibit Function ........................................................................................	63

Electrical Specifications
1769sc-IF8U ............................................................................................................	65
Environmental Conditions ......................................................................................	68
Regulatory
Compliance .............................................................................................................	68

Positive Decimal
Values .....................................................................................................................	69
Negative Decimal Values ........................................................................................	70

International Temperature Scale of 1990 ................................................................	73
Type B Thermocouples ..........................................................................................	73
Type E Thermocouples ..........................................................................................	75
Type J Thermocouples ...........................................................................................	77
Type K Thermocouples ..........................................................................................	78
Type N Thermocouples ..........................................................................................	80
Type R Thermocouples ..........................................................................................	82
Type S Thermocouples ..........................................................................................	83
Type T Thermocouples ..........................................................................................	86
References ..............................................................................................................	88

Table of Contents

vii

Appendix D

Using

Thermocouple

Junctions 95

Appendix E Module

Configuration Using MicroLogix 1500 and RSLogix 500 101

Appendix F Configuring Your 1769sc-IF8U Module with the Generic Profile for CompactLogix Controllers in RSLogix 5000 107

Using a Grounded Junction Thermocouple ...........................................................	95
Using an Ungrounded (Isolated) Junction Thermocouple ....................................	97
Using an Exposed Junction Thermocouple ...........................................................	97

Module Addressing .............................................................................................	101
Configuring the 1769sc-IF8U
in a MicroLogix 1500 System ................................................................................	103

Configuring I/O Modules .....................................................................................	111
Configuring a 1769sc-IF8U Universal Module ....................................................	112
Declaration of Conformity ....................................................................................	115

viii	Compact IO™ Universal Input Module

Who Should Use

This

Manual

How to Use This Manual

Related

Documentation

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

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.

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-IF8u.

The table below provides a listing of publications that contain important information about MicroLogix 1500 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

If you would like a manual, you can:

·download a free electronic version from the internet at www.theautomationbookstore.com

·purchase a printed manual by:

contacting your local distributor or Rockwell Automation representative · visiting www.theautomationbookstore.com and placing your order

xCompact™ I/O Universal Input Module

·calling 1.800.963.9548 (USA/Canada) or 001.330.725.1574 (Outside USA/Canada)

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.

·Text in this font indicates words or phrases you should type.

General

Description

Input Types and R a n g e s

Chapter 1

Module Overview

This chapter describes the 1769-IF8u Universal Input Module and explains how the module reads current, voltage, RTD, Resistance and thermocouple/millivolt analog input data. Included is information about:

·the module’s hardware and diagnostic features

·an overview of the system and module operation

·compatibility

The universal input module supports current, voltage, RTD, resistance, thermocouple and millivolt type inputs. The module digitally converts and stores analog data from any combination mentioned above. Each input channel is individually configured via software for a specific input device, data format and filter frequency, and provides open-circuit, over-range and under-range detection and indication.

Note: There are 8 on-board jumpers to configure between voltage and current modes. In current modes the module measures the input current across a low-drift precision resistor, measures the voltage, and converts to a current reading. For any input other than direct current measurements, the jumpers must be configured for voltage mode..

The tables below list the input types and their associated ranges.

Input Type		Ohm s
Resistance		0-150, 0-1000, 0-3000
RTD Type	Temperature Range (*C)
Copper 426	-100 to 260
Nickel 618	-100 to 260
Nickel 672	-80 to 260
Nickel-Iron 518	-200 to 200
Platinum385	-200 to 850
Platinum3916	-200 to 630

2	Compact IO™ Universal Input module

Data Formats

Filter

Fr equencies

Therm ocouple Type	Tem perature Range
Type B	300 to 1820C
Type C	0 to 2315C
Type E	-270 to 1000C
Type J	-210 to 1200C
Type K	-270 to 1370C
Type N	0 to 1300C
Type R	0 to 1768C
Type S	0 to 1768C
Type T	-270 to 400C

Voltage Types

±50 mV

±100 mV

±10 V

0 to 10 V

0 to 5 V

1 to 5 V

Current Input Range

0 to 20mA

4mA to 20mA

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

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:

·10 Hz

·50 Hz

·60 Hz

·250 Hz

·500 Hz

·1000 Hz

Chapter 1: Module Overview

3

H a r d w a r e Featur es

The module contains a removable terminal block. Channels are wired as differential inputs with the exception of RTD and resistance type inputs. One cold junction compensation (CJC) sensor can be added to the terminal block to enable accurate readings when using thermocouple input types. The CJC sensor compensates 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 done via the controller’s programming software and hardware jumper settings. 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. The illustration below shows the module’s hardware features.

1	2a
	OK
	Universal
	DANGER
	Do Not Remove RTB Under
	PowerUnless Area is Non-
10a	Hazardous
10
10b
	Ensure Adjacent Bus
	Lever is Unlatched/
	Latched Before/After
	Removing/Inserting
	Module
	2b

	8a
7a	7a
3	OK
	Universal
5a
9	5b
4	6
7b	7b
	8b

Item	Description
1	bus lever
2a	upper panel mounting tab
2b	lower panel mounting tab

3module status LED

4module 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

4	Compact IO™ Universal Input module

8b	lower DIN rail latch

9write-on label for user identification tags

10removable terminal block (RTB) with finger-safe cover

10a	RTB upper retaining screw
10b	RTB lower retaining screw
11	CJC sensor

S y s t e m O ve r v i e w

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.

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 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 input data 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 the Input Data File in chapter 4.

Using the module image table, the controller reads the two’s complement binary converted input 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.

Chapter 1: Module Overview

5

M o d u l e Operation

When the module receives the 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. If thermocouples are being utilized, the module continuously samples the CJC sensor and compensates for temperature changes at the terminal block cold junction, between the thermocouple wire and the input channel. See the block diagram below.

500V DC Isolation

Isource

CJC Input

Mercury ASIC

2.5

Isolation

MHz

18-pin

Input

Inputs

ADC

Block

Optical

Sigma Delta

Mux

Terminal

RTD/Ohm/V/I/TC

80c51XA

2.5V Ref

processor w/

LED

flash & SRAM

Offset Calibration

5VD

3.3VD

5V

3.3V

Reg

Isolated

+/-15V

5VI

24V

Power Supply

5V Reg

24V to +/-15V

The module is designed to support up to 4 channels of RTD or resistance and up to 8 channels of voltage, current, or thermocouple, but not concurrently. For every channel of RTD or resistance the module consumes 2 possible channels of voltage, current or thermocouple inputs. This is due to terminal block limitations in a single board module. There are five possible channel configuration combinations under this design architecture. See table below.

Configuration Choices for the 1769sc-IF8u

8 channels Voltage/Current/Thermocouple + 0 channels RTD/Resistance

6 channels Voltage/Current/Thermocouple + 1 channels RTD/Resistance

4 channels Voltage/Current/Thermocouple + 2 channels RTD/Resistance

2 channels Voltage/Current/Thermocouple + 3 channels RTD/Resistance

0 channels Voltage/Current/Thermocouple + 4 channels RTD/Resistance

6	Compact IO™ Universal Input module

Thermocouple and RTD measurements are linearized using the specifications listed in the table below.

Input Type	Specification
100? Pt 385	IEC-751, 1983
200Ω Pt 385	IEC-751, 1983
500Ω Pt 385	IEC-751, 1983
1000Ω Pt 385	IEC-751, 1983
100Ω Pt 3916	JIS C 1604, 1989
200Ω Pt 3916	IEC-751, 1983
500Ω Pt 3916	IEC-751, 1983
1000Ω Pt 3916	IEC-751, 1983
10Ω Cu 426	SAMA RC21-4-1966
120Ω Ni 618	DIN 43760 Sept. 1987
120Ω Ni 672	MINCO Application Aid #18, Date 5/90
604Ω Ni Fe 518	MINCO Application Aid #18, Date 5/90
J	NIST ITS 90
K	NIST ITS 90
T	NIST ITS 90
E	NIST ITS 90
R	NIST ITS 90
S	NIST ITS 90
B	NIST ITS 90
N	NIST ITS 90
C	From the Annual Book of Standards, American Society for Testing Materials

Thermocouple measurements utilize a single cold junction compensation sensor placed in the center of the terminal block. Thermocouple support includes types J, K, T, E, R, S, B, N, C with a range to 100 mV. In thermocouple mode the 1769sc-IF8u will measure thermocouple and CJC sensor voltages and convert the results to a linearized temperature reading. RTD support includes types Pt 385, Pt 3916, Ni 618, Ni 672, and Cu 426. In RTD and resistance modes the module will inject a constant current through the RTD or resistor, measure the voltage across the resistance, and convert to a linearized temperature or resistance reading. RTD and resistance input types support 2, 3, or 4-wire resistance measurements.

When configured for current or voltage type inputs, the module converts the analog values directly into digital counts.

Chapter 1: Module Overview

7

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 (Configuration Word 0, Bit 14) in chapter 4 for information on configuring the module to perform periodic autocalibration.

8	Compact IO™ Universal Input module

	Chapter 2
	Quick Start
	for Experienced Users
Before You Begin	This chapter can help you to get started using the 1769sc-IF8u Universal
	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.
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 and current inputs, Belden™ 9501, 9533 for RTD 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™)
What You Need To Do	This chapter covers:
	1. Ensuring that your power supply is adequate
	2. Attaching and locking the module

10Compact IO™ Universal Input 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 supply(1) has sufficient current	Reference
output to support your system configuration.
	Chapter 3
	(Installation and Wiring)

The modules maximum current draw is shown below

5V dc	24V dc
150 mA	45 mA

NOTE The module cannot be located more than 8 modules away from the system power supply.

(1) The system power supply could be a 1769-PA2, -PB2, -PA4, -PB4, or the internal supply of the MicroLogix 1500 packaged controller.

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.

	Chapter 2: Quick Start for Experienced Users	11

!ATTENTION! Remove power before removing or inserting this

module. If you remove or insert a module with power applied, an electrical arc may occur.

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.

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).

!ATTENTION! When attaching I/O modules, it is very important that the

bus connectors are securely locked together to ensure proper electrical connection.

! IMPORTANT A 1769-ECR or 1769-ECL right or left end cap respectively

must be used to terminate the end of the 1769 communication bus.

12	Compact IO™ Universal Input module
	Step 3: Wire the module.	Reference

Chapter 3

(Installation and Wiring)

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 ±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, 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 remove the CJC sensor from the terminal block if thermocouples are to be utilized. Removal of the sensor will reduce accuracy.

Note: For improved accuracy, use a remote terminal block configuration when possible. See chapter 3 for more details.

•For millivolt and current sensors, use Belden 8761 shielded, twistedpair wire (or equivalent) to ensure proper operation and high immunity to electrical noise.

•For RTD and resistance sensors, use Belden 9501 (2 wire), 9533 (3 wire) and 83503 ( for runs over 100 feet) or equivalent.

•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.

Chapter 2: Quick Start for Experienced Users

13

•To ensures 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

!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 D, 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.

•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 RTD and resistance sensors, this is at the module 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.

The terminal connections for the CJC sensor are shown below:

14	Compact IO™ Universal Input module
	Step 4: Configure the module.	Reference

Chapter 4

(Module Data, Status, and Channel

Configuration)

Circuit jumpers are located on the module to change the input path from current to voltage.

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 in chapter 4 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 universal module configuration settings, to the controller.

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	Reference
is operating correctly
	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.

Chapter 2: Quick Start for Experienced Users

15

16	Compact IO™ Universal Input module

Chapter 3

Installation and Wiring

This chapter tells you how to:

·determine the power requirements for the module

·avoid electrostatic damage

·install the module

·wire the module’s terminal block

·wire input devices

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 1769sc-IF8u 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 61000-6-4

EMC – Generic Emission Standard, Part 2 - Industrial Environment

· EN 61000-6-2

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 2006/95/EC 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 following AllenBradley publications:

·Industrial Automation, Wiring and Grounding Guidelines for Noise Immunity, publication 1770-4.1

·Automation Systems Catalog, publication B113

18 Compact IO™ Universal Input module

Power Requirements	The module receives power through the bus interface from the +5V dc/
	+24V dc system power supply. The maximum current drawn by the
	module is shown in the table below.
	Module Current Draw	at 5V dc	at 24V dc
		150 mA	45 mA

General

Considerations Compact I/O is suitable for use in an industrial environment when installed in accordance with these instructions. Specifically, this equipment is intended for use in clean, dry environments (Pollution degree 2(1)) and to circuits not exceeding Over Voltage Category II(2) (IEC 60664-1).(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, Division2.

·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.

Chapter 3: Installation and Wiring

19

Prevent 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.

·If available, use a static-safe work station.

·When it is not in use, keep the module in its static-shield bag.

Remove Power

!ATTENTION! Remove power before removing or inserting this module.

When you remove or insert a module with power applied, an electrical arc may occur.

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.

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:

20Compact IO™ Universal Input 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. 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.

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 rating. The maximum I/O module rating is 8, which means that a module may not be located more than 8 modules away from the system power supply.

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 Using the Dimensional Template, or DIN Rail Mounting. To

work with a system that is already mounted, see Replacing a Single

Module within a System.

The following procedure shows you how to assemble the Compact I/O

system.