Reliance Automax Automate PLC

Could someone kindly explain to me the difference between the Reliance Automax modules with and without the "C". Example 57C405 or 57405? What about the difference between say a 57C430 and the side label that says 0-57430-E?

Any help would be sincerely appreciated.

Thanks

James

Don't quote me on this, but from what I recall it's just a vintage thing (although it's all very old now). I think the modules without the C were earlier production units, but as I recall they function pretty-much the same and are generally interchangeable. Not sure why the side label started with a 0. The E might be a revision indicator.

The part number O-57430, the first character is the letter o(O) not zero(0).

Alan