Siemens U-55T 9301 (174-1) PLC Output Module

Siemens U-55T is a discrete-output module for PLC installations, designed to switch DC loads in industrial automation. The unit operates on 12–24 V DC and is intended for integration into Siemens TI-based control architectures as an Output Module, providing a dedicated interface for turning electrical loads on and off under program control. The full designation U-55T 9301 (174-1) identifies this specific variant within Siemens’ legacy I/O families, and the module weighs approximately 0.24 kg, reflecting a compact form factor suitable for mounting in standard PLC racks or backplanes. Siemens lists the U-55T as discontinued by the manufacturer, meaning new production is no longer available from the original source. As a DC-output module, it is designed to interface with DC-controlled devices and signaling circuits that are part of a Siemens automation system, relying on the same voltage range to ensure compatibility with other U-series I/O modules used in the same chassis.