The Siemens 6ES7221-1BF22-0XA0 is an 8-channel digital input module (EM 221) for SIMATIC S7-200 systems, designed to extend the input capacity of S7-22X CPUs. It accepts 24 V DC signals and supports sinking and sourcing wiring for each input, enabling flexible connections to field devices such as switches and sensors. With compact dimensions of 80 x 46 x 62 mm and an approximate weight of 150 g, this module is intended for use exclusively with S7-22X CPUs, providing reliable, plug-in digital input expansion in tight panel spaces.
