Siemens 6ES7221-1BH22-0XA8 is the EM 221 digital input module for SIMATIC S7-200 CN, designed for use with S7-22X CPUs and delivering 16 digital inputs at 24 V DC. Each of the 16 inputs accepts 24 V DC with a typical input current of 4 mA for a logic "1," and the module supports both sinking and sourcing wiring (SINK/SOURCE INPUT). Typical power consumption is 3 W, and the module measures about 71.2 mm wide, 80 mm high, and 62 mm deep, making it a compact expansion option for small PLC setups. This part is listed as a spare part for S7-22X CPU configurations within the S7-200 CN family.
