Rockwell Automation 1756-L55M12, Selection Manual, Page: 6 / 88

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1756-SG001G-EN-P — March 2004
Laying out a redundant system
The ControlLogix environment offers different levels of redundancy that you can
design into your system. These systems require additional hardware, so plan
accordingly. You can design redundant:
y
media for ControlNet
y
power supplies
y
controller chassis
Redundant ControlNet media
Requires:
y
1756-CNBR ControlNet modules
y
two identical ControlNet links
Redundant power supplies
Requires:
y
two redundant power supplies, any combination of 1756-PA75R and 1756-PB75R
y
1756-PSCA2 chassis adapter module, in place of the standard power supply
y
two 1756-CPR2 cables to connect the power supplies to the 1756-PSCA adapter
y
user-supplied annunicator wiring to connect the power supplies to the input
modules, if needed