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I tried your ZCP like this, and it triggerd the M12 when the 1 value was in D5, but as soon as it moved to D6 (its a shiftregistry) M12 turned off...
Edit: Seems like it just compares s1 and s2 with s3... not the whole range from D5 -D19
Thanks for you replies guys!
I have a Mitsubishi FX3GE plc.
Zone compare might work, never used it but i will look that up.
I cant look at the manual for the block cause my HELP command (F1) wont work, when i press F1 i get the following error: