Allen-Bradley 1747-L553 SLC 500 Processor Module

Allen-Bradley 1747-L553 SLC 500 Processor Module is a SLC 5/05 CPU for the SLC 500 modular controller family, delivering 64K words of user memory and integrated Ethernet and RS-232 communications. It provides Channel 1 Ethernet (10Base-T) for standard Ethernet networks and Channel 0 RS-232 (DH-485, DF1, or ASCII) to connect directly to serial devices or programming terminals. The processor supports up to 4,096 inputs and 4,096 outputs across up to 3 local I/O chassis on the SLC backplane, with a typical program scan time around 0.9 milliseconds and an I/O scan time around 0.225 milliseconds, per SLC 5/05 hardware specifications. Memory is backed by Flash for nonvolatile storage, helping retain programs and data during power cycles. As a CPU module, it plugs into the SLC 500 backplane and works with compatible 1747 I/O modules to form mid- to large-scale control systems, enabling ladder logic execution and data exchange over both Ethernet networks and RS-232 serial links. The 1747-L553 is identified within the SLC-500 family as a SLC 5/05 processor with built-in Ethernet and RS-232 ports, making it suitable for retrofitting older lines or integrating legacy devices into modern networked architectures.