Siemens 6ES5374-2KK21 Digital Input Interface Module

Siemens 6ES5374-2KK21 is a digital input interface module used to feed binary input signals into a Siemens automation controller. The part number 6ES5374-2KK21 uniquely identifies this device, which is designed to interface external devices—such as switches and sensors—with the control system, converting physical on/off states into digital data that the controller can process. As a Siemens product, this module is part of Siemens' automation ecosystem and provides a compact way to bring field signals into the PLC I/O structure. Users rely on these modules to capture real-time digital inputs critical for automation tasks and process control, aligning with standard Siemens digital input interface configurations and documentation for installation and operation.