Allen-Bradley 1745-E157 PLC Module

Allen-Bradley 1745-E157 is a SLC 150 expansion unit for Allen-Bradley 1745-series PLCs, designed to extend a controller’s transistor-output I/O by attaching to the SLC 150 expansion bus. Described in listings as TRNSTR (PNP) EXP UNIT, the module provides transistor-type outputs in a PNP configuration to drive field devices directly from the expansion module. The unit is powered from a 10-30 VDC sourcing supply, a common arrangement for 1745 expansion modules, enabling the added I/O to operate from the controller’s field power while maintaining straightforward wiring. Typical applications include expanding I/O on manufacturing lines, material handling, conveyors, and process-control tasks where SLC 150 controllers manage larger numbers of sensors and actuators. As an 1745-series expansion accessory, the 1745-E157 complements other TRNSTR-type modules and should be used with a compatible SLC 150 controller for proper operation.