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Even without a State Machine (which I use almost religiously thanks to learning about it from Joe), it's not that difficult to write a program that allows things to restart gracefully since all operands are retained automatically. The programmer must be cognizant of any timers and power-ups, but it's not that difficult.
I'm guessing your product is such that the work can be restarted.
I would use a State Machine and define a "pause state" that will turn everything off but remember the state number of where you stopped.
Take a look at this thread-
I am 99.9% certain that Unitronics proper is not going to make it easy to buy somebody else's product, especially Siemens.
If you're looking for help on this I'd go to one of the general purpose PLC forums and ask.