Industrial 6ES7 221-1BF22-0XA0 Relay Input Module

Siemens 6ES7-221-1BF22-0XA0 EM 221 DI 8 x 24 VDC is an eight-channel digital input module for the SIMATIC S7-200 family that reads eight discrete 24 V DC signals from field devices and feeds them into the PLC. Each channel captures a logic state from devices such as switches or sensors, enabling reliable digital inputs for automation tasks. The module measures 46 mm wide, 80 mm high, and 62 mm deep, weighs about 150 g, and has a dissipation of 2 W. It requires both +24 VDC for the input side and +5 VDC for internal electronics, with a total current draw around 30 mA (approximately 4 mA per channel when ON). This EM 221 component is documented as DI 8 x 24 VDC in Siemens’ MLFB listings, aligning with typical S7-200 input configurations for compact automation panels and retrofit projects where eight additional 24 V inputs are needed.