The 6ES7223-1BL22-0XA8: This is the SIMATIC S7-200 CN EM 223, a digital I/O expansion module intended only for S7-22X CPUs. It provides 16 digital inputs (24 V DC, sink/source) and 16 digital outputs (24 V DC, 0.75 A per channel). The module has no internal short-circuit protection—that must be provided externally. At 6 W typical power loss, it pulls 4 mA per active input at the rated 24 V DC.
How it compares to the newer S7-200 SMART EM 223 (6ES7223-1BL32-0XB0)
The CN version outputs 750 mA per channel; the SMART version outputs 0.5 A. Module width is 137.5 mm for CN, 70 mm for SMART.