Siemens 6ES7221-1BH32-0XB0 Digital Input Module

Siemens 6ES7221-1BH32-0XB0 digital input module for SIMATIC S7-1200 provides 16 digital inputs to interface field devices such as sensors, switches, and pushbuttons with a SIMATIC controller. Designed for DIN-rail mounting in industrial automation panels, it supports 24 V DC input signals within a 20.4–28.8 V range and is compatible with both sink (PNP) and source (NPN) configurations. Each channel draws approximately 4 mA, with backplane current consumption up to 130 mA at 5 V DC, and the module measures about 45 × 100 × 75 mm with a weight around 0.19–0.21 kg. This module is specifically built for the SIMATIC S7-1200 system, enabling reliable discrete-signal monitoring across manufacturing lines, packaging machines, conveyors, and process-control environments. Mounting on a DIN rail simplifies panel integration and retrofits, with common replacement options including Siemens 6ES7221-1BH30-0XB0 and 6ES7221-1BH50-0XB0.