MCR I/0 addressing for Allen-Bradley

MCR's do not have addresses, they function in pairs. A conditional MCR opens the zone, an unconditional MCR closes it.
 
I don't use them but as far as I can tell there is no addressing of MCR instructions. The only requirements are that they are used in pairs and that the closing MCR instruction be on its own rung with no conditional logic (only instruction on the rung).
 

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