Siemens 6ES7 221-1BF10-0XA0 is a digital input module (EM 221) for SIMATIC controllers, providing 8 x 24 V DC isolated input channels. It is designed for use with CPUs 221/222/224/224 XP/226 and supports both current sourcing and current sinking input configurations. As part of the EM 221 family, this module interfaces field devices such as sensors and switches to the PLC, integrating digital input signals within the Siemens S7 system.
