The program is in the dreaded 20.03
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dmroeder,
Dreaded indeed!
This came about when one of our L35E A series failed one day while I was on vacation. The only spare that was available was a fresh B series. The OEM's version was 15.3 and when they remote in, one of the support guys flashed the new PLC to the v20.03, plus had to make drastic changes for their program to run correctly.
Long story short, I went ahead and flashed the remaining L35E PLC and RSLogix 5000 program to the same version so that I wouldn't need a bunch of spare L35E PLCs.
K