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Allen-Bradley 1747-L543 SLC 5/04 processor module, 64K memory.
Allen-Bradley 1747-L543P SLC 5/04 processor module.
The Allen-Bradley 1747-L551 is an SLC 5/05 processor with 16K user memory and Ethernet communication.
Allen-Bradley SLC 500 5/05 processor module with 32K memory.