Total confusion, for me anyway..

I realise that a lot of machines have their own different coloured wiring going in to the the GX16 but surely there is a standard lineout for want of a better to the M542?

I've attached a pic to try to better explain what I mean, but could someone shed some light on what could be the more common or correct wiring format please. Wiring the M542's to the PSU and BOB along with the various on/off/e-stops was a piece of cake, this however is doing my 'ead in.

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