Specifications

Publication 1794-SG002D-EN-P - May 2012
78 About the FLEX Ex I/O Systems
Specify a FLEX Ex System
Follow these steps as you specify your FLEX Ex I/O system:
✓ Step See Page
1 Select an adapter and distribution method
Choose an adapter and fiber hub or coax barrier to
distribute FLEX Ex into the hazardous area. Or, choose a
bus isolator pair to connect to various networks.
Select FLEX Ex I/O Communication
Adapters and Distribution Method
1797-RPFM ControlNet Ex 3 km Fiber
Media Port Adapter
1797-BCNR Coax Barrier Module
1797-BIC Bus Isolator Module and
1797-CEC FlexBus Connector
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82
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2 Determine the I/O devices
• location of the device
• number of points needed
• appropriate catalog number
• number of points available per module
• number of modules
Digital I/O Modules
Analog Modules
HART Interface Modules
Counter I/O Module
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91
95
98
3 Select a terminal base
Choose an appropriate terminal base for your modules. Terminal Base Wiring Diagrams
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4 Select power supplies
• Choose appropriate power supply
• Ensure sufficient power for the communication
adapter and modules
Select a FLEX Ex I/O Power Supply
Understanding System Planning
Assigning Power Supplies
Hazardous Area Installation
General Specification Comparison
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5 Select optional accessories
• Determine whether to panel mount or DIN rail
mount the FLEX I/O system and at what
orientation (horizontal or vertical)
• Choose appropriate optional accessories to
enhance your system
Mount the FLEX System
1794-CE1 and 1794-CE3 Extender
Cables
1797-BOOT ControlNet BNC Boot
1797-INS Trunk Insulator and
1797-EXMK Marking Kit
ControlNet Ex Taps
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