Rockwell Automation 1769-OF4 User Manual

Compact I/O Analog Output Module

Catalog Number 1769-OF4

User Manual

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 available from your local Rockwell Automation sales 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.

IMPORTANT Identifies information that is critical for successful application and understanding of the product.

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

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.

Allen-Bradley, Rockwell Automation, Rockwell Software, Compact I/O, CompactLogix, MicroLogix, RSLogix 500, RSLogix 5000, RSNetWorx for DeviceNet, and TechConnect are trademarks of Rockwell Automation, Inc.

Trademarks not belonging to Rockwell Automation are property of their respective companies.

	Table of Contents
	Preface
	Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 7
	About This Publication . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	7
	Who Should Use This Publication . . . . . . . . . . . . . . . . . . . . .	7
	Additional Resources. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	8
	Chapter 1
Overview	Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	9
	Module Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	9
	System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	11
	Module Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	11
	Chapter 2
Installation and Wiring	Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	13
	General Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . .	13
	Hazardous Location Considerations . . . . . . . . . . . . . . . .	14
	Preventing Electrostatic Discharge . . . . . . . . . . . . . . . . .	14
	Removing Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	15
	Reduce Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	15
	Protect the Circuit Board from Contamination . . . . . . . . .	15
	Assemble the Compact I/O System . . . . . . . . . . . . . . . . . . .	16
	Mounting the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	17
	Minimum Spacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	17
	Mount to a Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	18
	Mount to a DIN Rail. . . . . . . . . . . . . . . . . . . . . . . . . . . .	19
	Replace a Single Module Within a System . . . . . . . . . . . . . .	19
	Grounding the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . .	20
	System Wiring Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . .	21
	Effect of Transducer/Sensor and Cable Length Impedance
	on Voltage Output Accuracy. . . . . . . . . . . . . . . . . . . . . .	22
	Label the Terminals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	23
	Remove the Finger-safe Terminal Block . . . . . . . . . . . . . . . .	23
	Wire the Finger-safe Terminal Block . . . . . . . . . . . . . . . . . .	24
	Wire Size and Terminal Screw Torque . . . . . . . . . . . . . .	25
	Wire the Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	25
	Chapter 3
Module Data, Status, and Channel	Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	29
Configuration	Module Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	29
	Input Image. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	30
	Output Image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	30
	Configuration File . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	30
	Input Data File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	31
	General Status Bits (S0…S3) . . . . . . . . . . . . . . . . . . . . . .	31
	Over-range (high clamp) Status Bits (O0…O3) . . . . . . . .	31

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Table of Contents

Module Diagnostics and

Troubleshooting

Under-range (low clamp) Status Bits (U0…U3) . . . . . . . . 32 Output Data File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Cancel Clamp Alarm Latch Control Bits (CLO0…CLO3

and CHO0…CHO3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Configuration Data File . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Channel Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Enable/Disable Channel (EC) . . . . . . . . . . . . . . . . . . . . . 35 Program Mode (PM). . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Program Value. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Fault Mode (FM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Fault Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Program to Fault Enable (PFE) . . . . . . . . . . . . . . . . . . . . 36 Clamping (limiting) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Clamp High and Clamp Low Data Values . . . . . . . . . . . . 37 Output Ramping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Type/Range Selection . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Data Format Selection . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Chapter 4

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Power Status Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Activate Devices When Troubleshooting . . . . . . . . . . . . . 44 Stand Clear of the Machine. . . . . . . . . . . . . . . . . . . . . . . 44 Program Alteration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Safety Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Power Cycle Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Channel Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Output Clamp Detection . . . . . . . . . . . . . . . . . . . . . . . . 45 Non-critical versus Critical Module Errors . . . . . . . . . . . . . . . 45 Module Error Definition Table . . . . . . . . . . . . . . . . . . . . . . . 46 Module Error Field. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Extended Error Information Field . . . . . . . . . . . . . . . . . . 46 Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 Invalid Output Range Selected . . . . . . . . . . . . . . . . . . . . 48 Invalid Output Format Selected . . . . . . . . . . . . . . . . . . . 48 Invalid Fault Value Selected . . . . . . . . . . . . . . . . . . . . . . 49 Invalid Program/Idle Value Selected(1) . . . . . . . . . . . . . . 49

Invalid Clamp Value Selected . . . . . . . . . . . . . . . . . . . . . 49 Invalid Ramp Rate Selected(1) . . . . . . . . . . . . . . . . . . . . . 49

Module Inhibit Function . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 Contacting Rockwell Automation . . . . . . . . . . . . . . . . . . . . . 50

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Table of Contents

Specifications

Module Addressing and Configuration with MicroLogix 1500 Controller

Configuration Using the RSLogix 5000 Generic Profile for CompactLogix Controllers

Two’s Complement Binary

Numbers

Appendix A

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

General Specifications – 1769-OF4 . . . . . . . . . . . . . . . . . . . . 51

Output Specifications – 1769-OF4 . . . . . . . . . . . . . . . . . . . . 52

Certifications – 1769-OF4. . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Replacement Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Appendix B

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Module Input Image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Module Output Image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Module Configuration File . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Configure Analog I/O Modules in a MicroLogix 1500

System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Appendix C

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 Add the Module to Your Project . . . . . . . . . . . . . . . . . . . . . 61 Configure Each I/O Module. . . . . . . . . . . . . . . . . . . . . . . . . 64

Appendix D

Positive Decimal Values . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Negative Decimal Values . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Glossary

Index

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Table of Contents

6	Publication 1769-UM020A-EN-P - December 2009

Preface

Introduction

Read this preface to familiarize yourself with the rest of the manual.

Topic	Page
About This Publication	7
Who Should Use This Publication	7
Additional Resources	8

About This Publication

Who Should Use This

Publication

This manual is a guide for using the Compact I/O Analog Output Module, catalog number 1769-OF4. It describes the procedures you use to configure, operate, and troubleshoot your module.

For detailed information on related topics like programming your CompactLogix or MicroLogix controller, or DeviceNet adapter, or for information on CompactLogix components, see the list of Additional Resources on page 8.

Use this manual if you are responsible for designing, installing, programming, or troubleshooting control systems that use Compact I/O modules.

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Preface

Additional Resources

These documents contain additional information about control systems that use Compact I/O modules.

Resource	Description
MicroLogix 1500 User Manual, publication 1764-UM001	A user manual containing information on how to install, use, and
	program your MicroLogix 1500 controller.
DeviceNet Adapter User Manual, publication 1769-UM001	A user manual containing information on how to install and use your
	1769-ADN DeviceNet adapter.
CompactLogix System User Manual, publication 1769-UM007	A user manual containing information on how to install, use, and
	program your 1769-L20 and 1769-L30 CompactLogix controllers.
CompactLogix Controllers User Manual, publication 1769-UM011	A user manual containing information on how to install, use, and
	program your 1769-L31, 1769-L32C, 1769-L32E, 1769-L35CR, and
	1769-L35E CompactLogix controllers.
Compact I/O Selection Guide, publication 1769-SG002	An overview of 1769 Compact I/O modules.
MicroLogix Programmable Controllers Selection Guide,	An overview of the MicroLogix 1500 system, including the 1769
publication 1761-SG001	Compact I/O system.
Industrial Automation Wiring and Grounding Guidelines,	In-depth information on grounding and wiring Allen-Bradley
publication 1770-4.1	programmable controllers.

You can view or download publications at http://literature.rockwellautomation.com. To order paper copies of technical documentation, contact your local Rockwell Automation distributor or sales representative.

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Chapter 1

Introduction

Module Description

Overview

Topic	Page
Module Description	9
System Overview	11
Module Operation	11

The module converts digital data from controllers to provide analog output data. The module provides the following output types and ranges.

Normal and Full Ranges

	Signal Type	Normal Operating Input Range	Full Module Range
		±10V DC	± 10.5V DC
	Voltage	1…5V DC	0.5…5.25V DC
		0…5V DC	-0.5…5.25V DC
		0…10V DC	-0.5…10.5V DC
	Current	0…20 mA	0…21 mA
		4…20 mA	3.2…21 mA

The data can be configured as:

•engineering units.

•scaled-for-PID.

•percent range.

•raw/proportional data.

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.

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Chapter 1	Overview

Hardware Features

1

2a

10a

10

10b

OK 3

Analog

DANGER

Do Not Remove RTB Under Power

Unless Area is Non-Hazardous

	V out 0 +
I out 0+
I out 1+	V out 1+
	V out 2+
I out 2+
I out 3 +	V out 3+
	ANLG
ANLG	Com
Com
	Ensure Adjacent	4
Bus Lever is Unlatched/Latched
Before/After
Removing/Inserting Module
1769-OF4

	8a
7a	2b
	7a

OK

Analog

5a
9	5b

		6
	7b	7b
		8b

Item	Description
1	Bus lever (with locking function)
2a	Upper-panel mounting tab
2b	Lower-panel mounting tab
3	Module status indicators
4	Module door with terminal identification label
5a	Movable bus connector with female pins
5b	Stationary bus connector 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 retaining screw
10b	RTB retaining screw

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Overview	Chapter 1

System Overview

Module Operation

The module communicates to the controller through the bus interface. The module also receives 5 and 24V DC power through the bus interface.

You can install as many analog modules as your power supply can support. However, the modules may not be located more than eight modules away from the system power supply.

Determine Power Supply Distance

CompactLogix Controller or I/O Communication Adapter	Compact I/O	Compact I/O	Compact I/O	System Power Supply	Compact I/O	Compact I/O	Compact I/O	End Cap
									Supply Distance
4	3	2	1		1	2	3 Power

or

MicroLogix 1500 Controller	CompactI/O	CompactI/O	CompactI/O	CompactI/O	CapEnd
with Integrated System
Power Supply
	1	2	3	4	Power Supply Distance

When you cycle power, the module performs a check of its internal circuits, memory, and basic functions. During this time, the module-status OK indicator remains off. If no faults are found during power-cycle diagnostics, the module-status OK indicator is turned on.

After power-cycle 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, the module begins its conversion process.

Each time a new output value is sent to the module, it is tested against user-configured high and low output clamps for each output channel. If output values equal to or exceeding either of these clamp levels are detected, the value sent to the module is clamped at that limit by the module, and unique bits are set in the output-channel status word.

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Chapter 1	Overview

The channel status words are described in the Input Data File on page 31.

The controller uses two’s complement binary data when communicating with 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 bus data transfer was made without error, the input data is used in your control program and the output data is used by the module.

No field calibration is required.

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Chapter 2

Introduction

General Considerations

Installation and Wiring

Topic	Page
General Considerations	13
Assemble the Compact I/O System	16
Mounting the Module	17
Replace a Single Module Within a System	19
Grounding the Module	20
System Wiring Guidelines	21
Label the Terminals	23
Remove the Finger-safe Terminal Block	23
Wire the Finger-safe Terminal Block	24
Wire the Modules	25

The Compact I/O system 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)

(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.

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Chapter 2 Installation and Wiring

Hazardous Location Considerations

This equipment is suitable for use in Class I, Division 2, Groups A, B, C, D or nonhazardous locations only. The following attention statement applies to use in hazardous locations.

	ATTENTION			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
				nonhazardous.
				• Do not connect or disconnect components unless power has
				been switched off or the area is known to be nonhazardous.
				• This product must be installed in an enclosure.
				• All wiring must comply with N.E.C. article 501-4(b).

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 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 box, when it is not in use.

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Installation and Wiring Chapter 2

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.

Reduce Noise

Most applications require installation in an industrial enclosure to reduce the effects of electrical interference. Analog outputs are highly susceptible to electrical noise. Electrical noise coupled to the analog outputs reduces 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 that 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 wiring away from any high-voltage I/O wiring.

Protect the Circuit Board from Contamination

Protect the board from dirt, oil, moisture, and other airborne contaminants by installing the system in an enclosure suitable for the environment. Keep the interior of the enclosure clean and the enclosure door closed whenever possible.

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Chapter 2 Installation and Wiring

Assemble the Compact I/O

System

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 18, or Mount to a DIN Rail on page 19. To work with a system that is already mounted, see Replace a Single Module Within a System on page 19.

3

4

2

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.

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.Use your fingers or a small screwdriver to push the bus lever back slightly to clear the positioning tab (3).

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Installation and Wiring	Chapter 2

Mounting the Module

6.To allow communication between the controller and module, move the bus lever fully to the left (4) until it clicks.

Make 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.

8.Lock the end cap bus terminator (6).

		A 1769-ECR or 1769-ECL right or left end cap must be used to
	IMPORTANT
		terminate the end of the bus.

Modules may be mounted to a panel or to a DIN rail.

	ATTENTION			During panel or DIN rail mounting of all devices, be sure that all
				debris (that is, metal chips or wire strands) is kept from falling
				into the module. Debris that falls into the module could cause
				damage when you cycle power.

Minimum Spacing

Maintain spacing from enclosure walls, wireways, or adjacent equipment. Allow 50 mm (2 in.) of space on all sides for adequate ventilation.

Space Requirements

Host Controller

Side

Top

Compact I/O			Compact I/O	Compact I/O	Compact I/O	Compact I/O	End Cap
		Bottom

Side

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Chapter 2 Installation and Wiring

Mount to a Panel

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.

Panel Mounting By Using the Dimensional Template

Locate holes every 17.5 mm (0.689 in.) to allow for a mix of single-wide and one-and-a-half-wide modules (for example, the 1769-OA16 module).

Spacing for single-wide modules 35 mm (1.378 in.).

Spacing for one-and-a-half-wide modules 52.5 mm (2.067 in.).

Refer to host controller documentation for this dimension.

Overall hole spacing tolerance: ±0.4 mm (0.016 in.).

132 mm (5.197 in.)

122.6 mm (4.826 in.)

Host Controller

Panel Mounting By Using the Modules as a Template

This procedure lets you 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. Due to 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.

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Installation and Wiring	Chapter 2

Replace a Single Module

Within a System

6. Attach the modules to the panel by using the mounting screws.

	TIP	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.

7. Repeat steps 1…6 for any remaining modules.

Mount to a DIN Rail

The module can be mounted by using the following 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.

The module can be replaced while the system is mounted to a panel (or DIN rail). Follow these steps in order.

1. 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.

2.On the module to be removed, remove the upper and lower mounting screws from the module or open the DIN latches by using a screwdriver.

3.Move the bus lever to the right to disconnect (unlock) the bus.

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Chapter 2 Installation and Wiring

Grounding the Module

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	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.

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 are in the unlocked (fully right) position.

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.

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. Refer to Industrial Automation Wiring and Grounding Guidelines, publication 1770-4.1, for additional information.

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Installation and Wiring	Chapter 2

System Wiring Guidelines Consider the following when wiring your system:

•All module commons (ANLG Com) are connected in the analog module.

•The analog common (ANLG Com) is not connected to earth ground inside the module.

•Channels are not isolated from each other.

•For optimum accuracy, limit overall cable impedance by keeping your cable as short as possible. Locate the I/O system as close to your sensors or actuators as your application will permit.

•Use Belden 8761, or equivalent, shielded wire.

•Under normal conditions, the drain wire and shield junction must be connected to earth ground via a panel or DIN-rail mounting screw at the analog I/O module end.(1)

•Keep shield connection to ground as short as possible.

•Voltage outputs (Vout 0+…Vout 3+) of the 1769-OF4 module are

referenced to ANLG Com. Load resistance for a voltage output channel must be equal to or greater than 1 kΩ .

•Current outputs (Iout 0+…Iout 3+) of the 1769-OF4 module

source current that returns to ANLG Com. Load resistance for a current output channel must remain between 0 and 600 Ω .

(1)In environments where high-frequency noise may be present, it may be necessary to directly ground cable shields to earth at the module end and via a 0.01 µF, 2000V capacitor at the sensor end.

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Chapter 2 Installation and Wiring

Effect of Transducer/Sensor and Cable Length Impedance on Voltage Output Accuracy

For voltage outputs, the length of the cable used between the load and the module can affect the accuracy of the data provided by the module.

Voltage Output Accuracy

Rs

Rc

+

Ri

Vs

V in

-

Rc

Where:

Rc = DC resistance of the cable (each conductor) depending on cable length

Rs = Source impedance (1 Ω)

Ri = Impedance of the voltage input

Vs = Voltage at the output of 1769-OF4 module

Vin = Measured potential at the module input

%Ai = Percent added inaccuracy in a voltage-based system due to source and cable impedance

[ Ri × V s]

Vin = -------------------------------------------------------

[Rs + ( 2 × Rc ) + Ri ]

For example, for Belden 8761 two conductor, shielded cable and a 1769-IF4 input module as the load:

Rc = 52.5 Ω/1000 m				V in
Rs = 1 Ω	%Ai =	1 –		--------
				V s × 100
Ri = 220 KΩ
Effect of Output Impedance and Cable Length on Accuracy
Length of Cable	DC Resistance of the Cable Rc		Accuracy Impact at the
			Load
50 m (164 ft)	2.625 Ω		0.00284%
100 m (328 ft)	5.25 Ω		0.00523%
200 m (656 ft)	10.50 Ω		0.01%
300 m (984 ft)	15.75 Ω		0.01477%

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Installation and Wiring	Chapter 2

Label the Terminals

Remove the Finger-safe

Terminal Block

As output impedance (Rs) and/or resistance (DC) of the cable (Rc) get larger, system accuracy decreases. If you determine that the inaccuracy error is significant, implementing the following equation in the control program can compensate for the added inaccuracy error due to the impedance of the module’s voltage outputs and cable.

		[ Rs + ( 2 × Rc ) + Ri]
		V s = V in × -------------------------------------------------------
		Ri
		For current outputs, source and cable impedance do not impact
	TIP
		system accuracy as long as the total resistance of the cable and
		input impedance of the load remain within the specified
		maximum limits for the module's current outputs.

A removable, write-on label is provided with the module. Remove the label from the door, mark the identification of each terminal with permanent ink, and slide the label back into the door. Your markings (ID tag) will be visible when the module door is closed.

When wiring field devices to the module, it is not necessary to remove the terminal block. If you remove the terminal block, use the write-on label on the side of the terminal block to identify the module slot location and type. RTB position (for one-and-a-half size modules) can be indicated by circling either the R for right side or L for left side.

Finger-safe Terminal Block

R SLOT # ____ L

MODULE TYPE _____ RoHS

To remove the terminal block, loosen the upper and lower retaining screws. The terminal block will back away from the module as you remove the screws. When replacing the terminal block, torque the retaining screws to 0.46 N•m (4.1 lb•in).

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