12 ProcessLogix and ControlLogix System Redundancy Module
Publication
1757-IN092E-EN-P - November 2007
Custom Cables
If you need more than 100 meters (300 feet) of distance between the primary
and secondary controller chassis, use your own custom fiber-optic cable. For a
custom cable:
• limit total light loss through the cable to less than or equal to 7 dB at
1300 nm wavelength.
• limit total cable length to less than or equal to 4 km (2.49 mi).
• use high quality 62.5/125 micron multi-mode fiber-optic cable.
• use professionally-installed SC connectors to connect to the
1757-SRM modules.
Place the Primary and Redundant Modules
Place a 1757-SRM module in corresponding slots in the primary and
redundant chassis. For example, if you place a module in slot five of the
primary chassis, you must place the second module in slot five of the
redundant chassis.
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Circuit Board
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