Specifications Parameter Category Details Manufacturer & Series Schneider Electric, Modicon TM3 Complete Model Number TM3XTRA1 Product Type TM3 Remote Rack Adapter / Expansion Rack Adapter Primary Function To create a TM3 remote expansion station, connecting a group of TM3 I/O modules to a distant main controller base (TM3XB). One main base can support up to 3 remote stations initiated by TM3XTRA1 modules. Connection Method • Main Station Side: Connects to the EXTENSION port of the main controller base unit (TM3XB). • Remote Station Side: It is the first module in the remote station, followed by standard TM3 I/O modules. Connection Cable Requires a dedicated TM3 Remote Extension Cable (e.g., TM3XCA... series). The maximum length is typically 10 meters (depending on the specific cable model). Expandability The number of TM3 I/O modules that can be connected on a single remote station initiated by TM3XTRA1 is limited by the 5V backplane current budget and the total number of modules supported by the main controller (e.g., Modicon M221/M251). Power Distribution Distributes 5V DC logic power from the main station to the remote station's modules via the extension cable. The 24V DC field power for I/O points must be supplied locally at the remote station. Communication Transmits TM3 bus data (I/O status, configuration) between the main controller and the remote I/O modules. Status Indicators LEDs to indicate power and communication status with the main station. Mounting Mounts on a standard DIN rail (35mm). The remote station requires its own DIN rail segment. Operating Temperature 0°C to +55°C Storage Temperature -25°C to +70°C Typical Applications Distributing I/O points closer to sensors and actuators in large machines, across production lines, or in multi-station systems to significantly reduce long and costly field wiring runs back to a central control cabinet.