Siemens 505-4116 Low Voltage DC Digital Input Module is a digital input interface for Siemens SIMATIC S5 controllers, designed to accept low voltage DC signals from field devices and translate them into PLC-compatible logic levels. It is used to monitor on/off states from sensors, switches, and other devices in industrial automation setups, enabling reliable state reading within the 505-series control architecture. As part of the SIMATIC S5 I/O family, it provides discrete input channels that integrate with the processor’s scan cycle to deliver timely updates of digital inputs.
