Allen-Bradley 1753-L28BBBM Safety Controller Module

Allen-Bradley 1753-L28BBBM GuardPLC 1600 Safety Controller is a compact safety controller module from Rockwell Automation designed for GuardPLC 1600 systems. It carries 250 KB of maximum user program memory, supports 20 safety-related digital inputs at 24 V DC, and provides 8 digital outputs that operate at 18.4–26.8 V (not electrically isolated). The unit includes two RS-485 ports: COMM1 delivers Modbus RTU Slave communication, while COMM3 exposes the GuardPLC ASCII Protocol port (with High-Speed Safety Protocol support in GuardPLC 1600 configurations), enabling integration with safety sensors, interlocks, and external controllers. As part of a GuardPLC 1600 controller, it is intended to implement safety-rated control logic for guarding devices, emergency-stop circuits, and related safety functions on industrial equipment, all powered from a 24 V DC supply. When deployed with compatible GuardPLC I/O modules and safety devices, the 1753-L28BBBM provides a cohesive safety control solution suitable for machine guards, door interlocks, and other safeguarding functions in manufacturing and processing environments.