Rockwell Automation 1797-CEC FLEX Ex Bus Isolator and Flexbus Connector - Manual (Page 4)

4 FLEX Ex Bus Isolator and Flexbus Connector
Publication 1797-5.13 - June 2010
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