This 6ES7221-1BF30-0XB0 is an 8-point digital input module for the Siemens S7-1200 family. It pulls 1.5 W from the backplane (105 mA at 5 V DC) and accepts 24 V DC field signals, with a logic "1" threshold at 15 V DC and 2.5 mA. The module is rated for a wide temperature range from -40 °C to 70 °C, making it usable in cold storage or hot cabinet environments. IP20 enclosure suits clean, dry control panels.
Mounting dimensions are 100 mm high, 45 mm wide, and 75 mm deep. The module requires a front connector (sold separately) and sits on the S7-1200 rail. Inputs are arranged in groups of two, with a common reference per group. Unshielded cable runs up to 300 m; shielded runs up to 500 m. Diagnostic alarm and status indication are built in. Power loss is 1.5 W typical, so thermal load in a dense cabinet is manageable.