Allen-Bradley 1747-L542 PLC CPU

Feature & Principle

It is the SLC 5/04 processor of Allen-Bradley SLC 500 PLC system. It runs ladder logic program to complete logic control, timing, counting and data processing. Equipped with dual communication interfaces: DH+ for inter-controller networking and RS232 DF1 for programming and HMI connection. It supports up to 4096 logical I/O points, installed in slot 0 of 1746 chassis and powered by rack backplane. Lithium battery keeps program and data when power off. It is widely used in legacy automation retrofitting projects.

Specifications

Model: 1747-L542 Brand: Allen-Bradley (Rockwell Automation) Series: SLC 500, SLC 5/04 User memory: 32K words Communication: DH+ , RS232 DF1 / ASCII Max logical I/O: 4096 input + 4096 output Compatible chassis: 1746 series rack Backup battery: 1747-BA Lifecycle: Discontinued legacy spare Application: Water treatment, material handling, packaging machine old control cabinet Certification: CE, UL

Components & Diagnostics

Main CPU board, communication circuit, status LED indicators, lithium backup battery, backplane connector. Common faults: battery low alarm, DH+ communication failure, CPU fault, cannot go to run mode.

Product Brief

1747-L542 SLC 5/04 processor, Allen-Bradley SLC500 PLC spare widely used for old automation control cabinet overhaul and replacement.