Well I find myself once again in the need of information from the participants of this forum. What makes a PLC a PLC? We have a control panel that once used "markload" alternating relays, timers and analog signal conditioners. Over the years it evolved to a "programmable relay" to perform these functions, specifically the "Moeller" smart relay. I believe this relay is the exact same unit used for Allen Bradley's "pico". My problem is that a specific customer's engineer has declared this relay a PLC and as such falls under their requirement that "all PLCs be Allen Bradley SLC500".
I know the functional differences between the two but what documentation / argument can be provided to convince him that a programmable relay is not a PLC?
I must meet with him this Thursday 10/16 to plea our case.
Thanks in advance for any input.
I know the functional differences between the two but what documentation / argument can be provided to convince him that a programmable relay is not a PLC?
I must meet with him this Thursday 10/16 to plea our case.
Thanks in advance for any input.