The Allen-Bradley 1746-A2 is a 2-slot expansion rack for the SLC 500 programmable logic controller (PLC) system by Rockwell Automation.

• Function: It increases the number of input/output (I/O) modules you can connect to your SLC 500 processor. The SLC 500 processor itself has a limited number of built-in I/O points, so the 1746-A2 allows you to add more for larger control applications.
• Capacity: It can hold two additional SLC 500 I/O or communication modules.
• Compatibility: It works with both SLC 500 modular systems and SLC 500 fixed systems.

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