Allen-Bradley 1747-L552 SLC 500 Ethernet Controller

The Allen-Bradley 1747-L552 SLC 500 Ethernet Controller is an SLC 5/05 Processor in the SLC 500 family that provides integrated Ethernet and RS-232 communications in a single CPU for legacy control networks. It offers 32K words of user memory for ladder logic and data, and supports up to 4,096 discrete inputs and 4,096 discrete outputs across a compatible SLC 500 chassis. The unit includes one Ethernet port (10 Mbps) and one RS-232 serial port for programming, diagnostics, or serial device connections. Performance specifications include an approximate program scan time of 0.9 ms and an I/O scan time around 0.225 ms, enabling responsive control for typical small-to-mid-size applications. Programming is typically conducted with RSLogix 500, and the 1747-L552 can be augmented with an EtherNet/IP solution such as the 1747-AENTR Ethernet/IP adapter to extend network connectivity. This processor is designed for legacy SLC 500 systems requiring Ethernet and RS-232 integration, offering a straightforward path to networked control while retaining familiar RS-232 interfacing and ladder-based programming.