Siemens 6ES7 221-1BH32-0XB0 Digital Input Module

Siemens 6ES7221-1BH32-0XB0 digital input module offers 16 digital inputs for SIMATIC S7-1200 PLC systems, enabling reliable signal acquisition from sensors, switches, and pushbuttons in industrial automation. It accepts 24 V DC input with a 20.4–28.8 V range and supports sink/source wiring (PNP/NPN compatible) with approximately 4 mA per channel. The module draws up to 130 mA from the 5 V backplane and measures about 45 × 100 × 75 mm, weighing roughly 0.19–0.21 kg, and mounts on a DIN rail. System compatibility is with SIMATIC S7-1200 PLCs, making it suitable for manufacturing lines, conveyors, packaging machines, and process control environments where discrete inputs must be monitored. Lifecycle status is Active with a phase-out announced; common replacements include Siemens 6ES7221-1BH30-0XB0 and 6ES7221-1BH50-0XB0 for potential retrofit considerations.