Allen Bradley SLC500 1747-L20A memory fault

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I have Allen Bradley SLC500 1747-L20A ser.B. On the electronic board, I have two EPROM memory chips. How can the processor read the second chip? Now reads only 1747-M1. And I need to read SLC500 FX1CPU. When I remove the first chip, the processor gives an error.

Edited by oleggch

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