Siemens 6ES5 405 7AB 21 SIMATIC S5-110 Input Module SL

The Siemens 6ES5-405-7AB21 digital input module for the SIMATIC S5-110 provides eight galvanically isolated digital inputs designed to read 220 V AC field signals from switches and sensors. It is intended to plug into the S5-110 backplane, extending the PLC’s I/O capacity while keeping field wiring isolated from the controller. As part of the 6ES5-405 family, this 8-channel module offers reliable line‑voltage input capability for industrial automation, with applications spanning manufacturing lines, packaging equipment, and material handling where robust binary sensing of 220 V AC devices is required. Each channel operates independently to simplify wiring and troubleshooting in control panels, delivering straightforward integration with standard industrial sensors and relays.