Allen-Bradley 1746-BTM Barrel Temperature Module

The Allen-Bradley 1746-BTM Barrel Temperature Module is an SLC 500 I/O device designed specifically to regulate and monitor barrel temperatures in injection-molding and extrusion processes. It is intended for use in a local I/O chassis within an SLC 500 system, serving as the dedicated controller for heater elements that manage the barrel temperature. The module operates from the SLC backplane at 5 V and draws about 110 mA, a moderate power draw for a temperature-control module in this platform. As part of the 1746 family, the 1746-BTM is documented in Allen-Bradley literature as a Barrel Temperature Control Module, with user manuals such as 1746-UM010 describing installation, wiring, and application guidance. Typical applications include maintaining precise barrel temperatures on injection-molding machines and extruders, where stable thermal profiles are essential for material quality and process consistency. The unit’s role is to provide the dedicated hardware interface for temperature sensing and heater control within the barrel temperature control loop, enabling the connected PLC to regulate temperature setpoints accurately. This part number—1746-BTM—is recognized by Rockwell Automation as a legacy SLC 500 I/O module designed specifically for barrel temperature control tasks.