Siemens 6AV1222-0AD20 Interface Processor, PLC Expansion Mod

The Siemens 6AV1222-0AD20 is an interface processor for PLC expansion, classified under PLCs and Accessories. It sits in the PLC Expansion Modules sub-category, meaning its role is to extend the communication or processing capability of a Siemens PLC backplane — it is not a standalone controller, but a module that adds a specific interface to the rack.