Rockwell SLC 500 Controller

The Allen‑Bradley 1747‑L542 is an SLC 5/04 modular processor from Rockwell Automation's SLC 500 family, offering 32K words of user memory and supporting up to 4,096 discrete I/O points. As the mid-range model in the 5/04 series, it features built-in Data Highway Plus (DH+) and RS-232 communication ports, enabling high-speed peer-to-peer messaging with PLC-5, SLC, and ControlLogix processors.

The Allen‑Bradley 1747‑L541 is an SLC 5/04 modular processor from Rockwell Automation's SLC 500 family, offering 16K words of user memory and supporting up to 4,096 discrete I/O points. It features built-in Data Highway Plus (DH+) and RS-232 communication ports, enabling high-speed peer-to-peer messaging with PLC-2, PLC-5, and ControlLogix processors.