What this RS-422A/485 option board does
The CP1W-CIF12 is an isolated RS-422A/485 option board that plugs into a CP1E-series PLC to add a serial communication port. It is a CP1E-series accessory, not a standalone module — it mounts inside the CPU unit's option slot, not on a DIN rail.
Lifecycle status and sourcing reality
The part is available through independent surplus and broker channels; quantities are lot-specific and confirmed at RFQ.
This board is designed for the CP1E series only — it will not fit CP1H, CP1L, or CJ-series CPUs without a different option slot layout. The RS-422A/485 interface provides isolated serial communication, typically used for connecting to HMIs, VFDs, or other serial devices on a multi-drop network.