Allen-Bradley/Rockwell Automation 1747-L553 module is a CPU or Central Processor Unit module from the Allen-Bradley SLC 500 and SLC 5/05 series. This CPU has CMOS RAM built into it that supports battery backup, and it can also support an Allen-Bradley 1747-M13 memory module that provides it with 64 K of additional memory. The 1747-L553 CPU module has an Ethernet channel and an RS-232, DH-485, DF1, or ASCII port. This CPU is one of the most flexible CPUs that is available from the SLC 500 and SLC 5/05 series because it can handle up to 64 connections. This means that the 1747-L553 CPU module can communicate with 64 devices or applications simultaneously.
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