Spare part module for S7-200 CN systems
The Siemens 6ES7221-1BH22-0XA8 is a SIMATIC S7-200 CN digital input module EM 221, designated as a spare part for the S7-22X CPU line. It provides 16 sinking/sourcing inputs at 24 V DC, with a typical power loss of 3 W and a per-channel signal current of 4 mA. The module is approved only for CE marking, consistent with the S7-200 CN regional variant. This module is a direct fit for existing S7-200 CN racks, but only when the customer's approved vendor list (AVL) explicitly includes this spare part designation. Its form factor (62 mm depth, 71.2 mm width, 80 mm height) matches the earlier S7-200 CN I/O footprint.
Physical fit and integration note
The module measures 62 mm deep, 71.2 mm wide, and 80 mm high. Per channel typical signal current is 4 mA and total power loss is 3 W.