OK, will have to research buffer board however this might be easier with a bit of code? Let me explain.

In the 'M6 Program' on the SZGH, you can define code.

This is the current code to state which Tool is active. 8 Scenarios, 4 inputs. Could I not simply swap the logic?

CASET1+X00-X01-X02-X03
CASET2-X00+X01-X02-X03
CASET3+X00+X01-X02-X03
CASET4-X00-X01+X02-X03
CASET5+X00-X01+X02-X03
CASET6-X00+X01+X02-X03
CASET7+X00+X01+X02-X03
CASET8-X00-X01-X02+X03

I might try this later but still need to complete some wiring before I Can check.