The Siemens Simatic U-25N Input Module is a digital input card for SIMATIC PLC systems that accepts external 100–120 VAC signals and converts them into PLC-ready inputs. Designed for use in compatible Siemens racks, the U-25N expands a controller’s input capability while remaining compatible with standard SIMATIC hardware. For proper installation, verify your chassis and CPU support the U-25N family and ensure wiring conforms to the 100–120 VAC input specification.
