Let the fun begin !!! ???

[PAULRO]

Thanks for that Jazz, i got totally confused trying to accommodate a hardwired circuit with the e stop and an alarm input to the BOB( both versions of what you have sketched). my BOB has a dedicated input for force turning off the ENABLE, at least i think that's what it does. i'm trying to use just 1 relay and as it stands and i have that in the PSU & e/ stop circuit. I have updated the dwg to reflect what i think is your schematic. i probably don't need an input from the alarm drives to the BOB. i got caught up in thinking that an input to MACH 3 was required. i also had a look at Eddies dwg and saw that the alarms from his drives were in series so that added more ??????. as in connecting a ground wire to the positive terminal of the alarm drive and out the negative terminal and on to the next drives positive terminal etc. that really had me confused along with a dose of the flu which got my head in a spin. i don't need an e/stop signal to the BOB so on reflection , or do i?