CPU compatibility and I/O map
The Siemens 6ES7223-1BL20-0XA0 is an EM 223 expansion module for the S7-22X CPU family only — it will not latch onto the S7-1200 or S7-1500 backplane. It provides 16 digital inputs at 24V DC and 16 digital outputs at 24V DC in a single unit, which simplifies the I/O map for a machine section that needs balanced point counts on the same potential.
