The 6ES7223-1BF21-0XA0 is a SIMATIC S7-200 EM 223 digital I/O expansion module from Siemens, delivering 4 digital inputs and 4 digital outputs at 24V DC. It is designed exclusively for S7-22X CPUs, so verify your base unit before stocking.
Sourcing and Stocking
Because it's an active line part, the 6ES7223-1BF21-0XA0 can be sourced against an RFQ with standard lead times. No cross-reference or substitute is needed; this is the direct replacement for the exact I/O count in the EM 223 family.