Allen-Bradley 1747-L542 is a SLC 500 system processor unit (CPU) in the 1747-L5x family, featuring 16K memory and REV 7. This CPU module is designed to sit in a 1747 backplane chassis to control 1747-series I/O modules and execute ladder logic for centralized processing in legacy AB automation systems. The model is commonly used as the controller in small to mid-size automation setups, with power requirements of 5 V DC at 1.0 A and 24 V DC at 175 mA. Note that the 1747-L542 is not a DC output module, but a processor that coordinates I/O and communications within SLC 500 configurations.
