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Old June 28th, 2018, 02:33 PM   #3
Ken Roach
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Join Date: Apr 2002
Location: Seattle, WA
Posts: 14,295
What are the machines running now ?

1756-L71 and -L72 controllers are available in stock from most A-B dealers. Why would you buy an intermediate controller (which you would have to program with v20 or lower software) ?

I am skeptical of any company that claims to "refurbish" a PLC controller. No other companies have access to the RA-specific chips that would be required for some things (like the backplane ASIC issue ten years ago). Most aftermarket sellers load the current firmware and do a short burn-in test (if that).

Last edited by Ken Roach; June 28th, 2018 at 02:39 PM.
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