What it is and where it fits
The 6ES7223-1PH21-0XA0 is a SIMATIC S7-200 EM 223 module with 8 digital inputs at 24 VDC (sink/source) and 8 relay outputs rated 2 A per point. It connects to the S7-200 backplane and works only with S7-22X CPUs. Relay outputs rated 2 A per point. Use external suppression for inductive loads.
Sourcing and lifecycle
Lifecycle status is marked current, meaning Siemens is actively producing this module. No last-time-buy or phase-down notice is in effect, so the supply chain is stable for BOM frozen designs. This part is a standard catalog item; procurement can quote it to order against an RFQ without obsolescence risk.