Rockwell Automation 1797-BIC User manual

Publication 1797-IN513G-EN-P - August 2017
Installation Instructions
FLEX Ex Bus Isolator and Flexbus Connector
Catalog Numbers 1797-BIC, 1797-CEC
Topic 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

2FLEX Ex Bus Isolator and Flexbus Connector
Publication 1797-IN513G-EN-P - August 2017
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.
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 consequences.
SHOCK HAZARD
Labels may be on or inside the equipment to alert people that dangerous voltage may be
present.
BURN HAZARD
Labels may be on or inside the equipment to alert people that surfaces may reach
dangerous temperatures.

FLEX Ex Bus Isolator and Flexbus Connector 3
Publication 1797-IN513G-EN-P - August 2017
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
1Power indicators
2Label
3Module locking tab
4Removable power connector
5FLEX Ex backplane connector
6FLEX Ex backplane connector cover
7Master backplane connector
8FLEX I/O backplane connector
QUAL ITY
B
-
A
Allen-Bradley
1797 - CEC
FLEXBUS
CONNECTOR
12 4
3
+V -V +V -V
1797 - BIC
PWR
QUALI T Y
B
-
A
Allen-Bradley
FLEXBUS
ISOLATOR
42641
1
2
34
5
6
7
8
2
3
1797-CEC 1797-BIC

4FLEX Ex Bus Isolator and Flexbus Connector
Publication 1797-IN513G-EN-P - August 2017
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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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
or
Zone 2
Hazardous Area
Zone 1
1794-CE3
FLEX Ex system Max of
1 m (3.28 ft)
Field Wiring to
Zone 0
40087

FLEX Ex Bus Isolator and Flexbus Connector 5
Publication 1797-IN513G-EN-P - August 2017
Module Installation
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.
ATTENTION
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.
ATTENTION
For proper operation, cycle power to the 1797-BIC module at the
same time power is cycled to the associated adapter.
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