Allen Bradley ControlLogix 1756-L71 PLC – Configuring Redundant Systems – IntroAutomation

The following PLC Architecture will control the process of a gas compressor station.

The Architecture is divided in 2 control systems.
-Process Control System (PCS)
-Safety Instrumented System (SIS)

PCS & SIS follow ring topology for I/O cards.

The SIS must be redundant, in order to ensure safety process control!

For PCS we use ControlLogix PLC 1756-L71.

For SIS we use 2 ControlLogix PLCs 1756-L71, each equipped with
1756-RM2/A Redundancy Module.

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