The ABB IT94-3 HESG440310R2 HESG112699/B is a Redundant module.

·Input modules: These modules receive signals from sensors and other input devices.
·Output modules: These modules send signals to actuators and other output devices.
·Power supply modules: These modules provide power to the PLC and its modules.
·CPU modules: These modules are the brain of the PLC, and they are responsible for processing instructions and controlling the operation of the other modules.
·Communication modules: These modules allow the PLC to communicate with other devices, such as HMI (human-machine interface) panels and other PLCs.

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