Rockwell Automation 1797-CEC User Manual

Installation Instructions

FLEX Ex Bus Isolator and Flexbus Connector

Catalog Numbers 1797-BIC, 1797-CEC

Top ic Page

Important User Information 2

About the Isolator and Flexbus Connector 3

Product Features 4

Intermixed Systems 4

Module Installation 5

Installation in Zone 2 10

Installation in Zone 22 10

Electrostatic Charge 11

Removal and Insertion Under Power 11

European Communities (EC) Directive Compliance 12

Inputs and Outputs 15

Wire the Isolator Module 16

Indicators 17

About the Mounting Kit 17

Specifications 20

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2 FLEX Ex Bus Isolator and Flexbus Connector

WARNING

IMPORTANT

ATTENTION

SHOCK HAZARD

BURN HAZARD

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.literature.rockwellautomation.com) 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 we use notes to make you aware of safety considerations.

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.

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

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 consequences.

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Labels may be on or inside the equipment to alert people that dangerous voltage may be present.

Labels may be on or inside the equipment to alert people that surfaces may reach dangerous temperatures.

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FLEX Ex Bus Isolator and Flexbus Connector 3

QUALITY

B-A

Allen-Bradley

1797 - CEC

FLEXBUS

CONNECTOR

12 4

+V -V +V -V

1797 - BIC

PWR

QUALITY

B-A

Allen-Bradley

FLEXBUS

ISOLATOR

42641

1797-CEC 1797-BIC

About the Isolator and Flexbus Connector

Use the FLEX Ex bus isolator to interconnect standard FLEX I/O modules to intrinsically-safe FLEX Ex modules in the same I/O group

Component Identification

1 Power indicators 2 Label 3 Module locking tab 4 Removable power connector 5 FLEX Ex backplane connector 6 FLEX Ex backplane connector cover 7 Master backplane connector 8 FLEX I/O backplane connector

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4 FLEX Ex Bus Isolator and Flexbus Connector

Mix Systems in the Safe Area

Any Communication Adapter Supported by FLEX I/O system

Bus Isolator

1797-CEC

1797-BIC

FLEX I/O system

Nonhazardous Area

Zone 2

Hazardous Area

Zone 1

1794-CE3

FLEX Ex system

Max of 1 m (3.28 ft)

Field Wiring to Zone 0

40087

Product Features

 Provides an IS-compatible mechanism to separate two sections of the

backplane allowing IS and non-IS field-device wiring to the same I/O group.

 Converts hazardous power to IS-safe power to run one side of the bus

receiver/transmitter circuitry and IS-safe FLEX Ex backplane power to slave side modules.

 Allows up to eight FLEX Ex modules may be attached to the slave

side.

Intermixed Systems

The bus isolator modules, 1797-BIC and 1797-CEC, let you configure FLEX Ex modules and FLEX I/O modules on the DIN rail when attached to the same adapter and grouped together on appropriate sides of the bus isolator module. This highly flexible, cost-effective solution combines intrinsically safe and nonintrinsically safe systems.

Intermixed systems can be configured for use in the:

 safe area much like traditional IS and I/O systems.  hazardous and safe control equipment where the distance of physical

separation is short.

 FLEX Ex I/O with communication adapters that are not intrinsically

safe.

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FLEX Ex Bus Isolator and Flexbus Connector 5

ATTENTION

1794

Adapter

1797

CEC

1797

BIC

1797 I/O

& Base

1797 I/O

& Base

1797 I/O

& Base

1797 I/O

& Base

1797 Power Supply

24V dc Power Supply

42754

Module Installation

This equipment is considered Group 1, Class A industrial equipment according to IEC/CISPR Publication 11. Without appropriate precautions, there may be potential difficulties ensuring electromagnetic compatibility in other environments due to conducted as well as radiated disturbance.

This equipment is supplied as open-type equipment. It must be mounted within an enclosure that is suitably designed for those specific environmental conditions that will be present and appropriately designed to prevent personal injury resulting from accessibility to live parts. The interior of the enclosure must be accessible only by the use of a tool. Subsequent sections of this publication may contain additional information regarding specific enclosure type ratings that are required to comply with certain product safety certifications.

These products are grounded through the DIN rail to the dedicated intrinsic safety ground. Use zinc plated yellow-chromate steel DIN rail to assure proper grounding. The use of other DIN rail materials (such as aluminum or plastic) that can corrode, oxidize, or are poor conductors, can result in improper or intermittent grounding.

Make certain that you only connect the FLEX Ex backplane connector to other intrinsically-safe system modules to maintain the integrity of the intrinsically-safe backplane.

For proper operation, cycle power to the 1797-BIC module at the same time power is cycled to the associated adapter.

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42642

41377

1797-CEC Module Installation

The 1797-CEC module mounts on a DIN rail. It connects to an adapter or another FLEX I/O module. If using this module with FLEX I/O modules, do not mount between FLEX I/O modules. Mount the 1797-CEC module to the right of FLEX I/O modules. Follow these steps to mount this module.

1. Remove the cover plug (if used) in the male connector of the unit to which you are connecting this module.

2. Position the module on the 35 x 7.5 mm DIN rail A (A-B pt. no. 199-DR1).

3. Rotate the module onto the DIN rail with the top of the rail hooked under the lip on the rear of the module.

1797-CEC

4. Press down to lock the module on the DIN rail.

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FLEX Ex Bus Isolator and Flexbus Connector 7

42643

1797-CEC

42644

If the module does not lock in place, use a screwdriver or similar device to move the locking tab down, press the module flush with the DIN rail and release the locking tab to lock the module in place.

5. Firmly push the module into the adjacent module or terminal base until the units lock together.

1797-CEC

6. To remove the 1797-CEC module, you must work from the right side and remove one module at a time. To disengage a module from its neighbor, place a common, flat-bladed screwdriver between the two modules and turn 1/4 turn to separate the modules.

7. Then slide the module away from its left neighbor, and release the locking lever to remove the module from the DIN rail.

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8 FLEX Ex Bus Isolator and Flexbus Connector

42645

1797-CEC

-V

PWR

FLEXBUS

ISOLATOR

1797-BIC

42646

Install the 1797-BIC Module

The 1797-BIC module mounts on a DIN rail. It connects to a 1797-CEC module.

1. Remove the cover plug (if used) in the male connector of the unit to which you are connecting this module.

2. Position the module on the 35 x 7.5 mm DIN rail A (A-B pt. no. 199-DR1).

3. Rotate the module onto the DIN rail with the top of the rail hooked under the lip on the rear of the module.

1797-CEC

-V +V

1797-BIC

FLEXBUS

ISOLATOR

PWR

-V

4. Press down to lock the module on the DIN rail.

If the module does not lock in place, use a screwdriver or similar device to move the locking tab down, press the module flush with the DIN rail, and release the locking tab to lock the module in place.

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FLEX Ex Bus Isolator and Flexbus Connector 9

WARNING

1797-CEC

-V

PWR

FLEXBUS ISOLATOR

1797-BIC

42647

5. Firmly push the module into the adjacent module/terminal base until the units interconnect.

6. Install DIN rail locks (supplied with the 1797-BIC module) to meet shock and vibration specifications as listed on page 20.

7. To remove the 1797-BIC module, remove the DIN-rail locks and then slide the module away from its left neighbor, and release the locking lever to remove the module from the DIN rail.

Do not remove the 1797-CEC or 1797-BIC modules under power. Removing these modules under power will break the electrical backplane (flexbus) connections. This 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.  breaking communication to modules beyond this module.

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