Spare-part module for the S7-200 platform
The 6ES7223-1BM22-0XA0 is a SIMATIC S7-200 EM 223 digital I/O expansion module, designated as a spare part for the S7-22X CPU family. It provides 32 digital inputs and 32 digital outputs, all operating at 24 V DC, in a single unit that snaps onto the S7-200 rail alongside the CPU. Each output channel is rated for 0.75 A resistive or inductive load, with a group limit of 10 A per 16-output group. The module draws up to 240 mA from the 5 V DC backplane bus and up to 128 mA from the external 24 V supply (4 mA per active input).
Input and output characteristics
Inputs accept 24 V DC sink/source wiring with a signal "1" threshold of 15 V to 30 V DC (typical 4 mA at 24 V). The input filter delays the rising edge by up to 4.5 ms, which filters out contact bounce but also sets the minimum detectable pulse width for fast-counting applications. Outputs are rated 0.75 A per channel with inductive shutdown clamped to L+ (-48 V). The module includes optocoupler isolation between the backplane and the I/O circuits, tested at 500 V AC. Plug-in I/O terminals simplify field wiring replacement without removing the module from the rail. Typical power loss is 9 W, which should be factored into the enclosure thermal budget, especially when all 32 outputs are loaded near the 0.75 A per-channel limit.
This module carries a current lifecycle stage, meaning it remains in the Siemens portfolio as a spare part for the S7-200 platform. The S7-200 family is a mature product line, and this EM 223 is intended for maintenance and replacement of existing installations rather than new system designs.