ABB CM579-PNIO 1SAP170901R0101 is an AC500 PROFINET IO communication module that places an IO controller between the AC500 processor and distributed PROFINET devices. Its two RJ45 ports form an integrated switch, so cyclic process data and acyclic service traffic enter the controller through one network module rather than through separate adapters.

Mounted on a compatible TB56xx terminal base, ABB CM579-PNIO 1SAP170901R0101 receives its internal supply through the communication-module interface and draws field-side power from the CPU terminal base. The module exchanges up to 1,440 bytes per attached I/O module on later firmware while the controller total depends on the installed PM56xx processor.

Five front indicators on ABB CM579-PNIO 1SAP170901R0101 separate module, network and port state. Process, diagnostic, plug and pull alarms reach the application program, where alarm handling can be linked to the affected remote station instead of treating every network event as a controller fault.