motor on command from plc

I'm setting up a new abb machine cell for pick and place routine. when trying to set up the startup routine we've discovered an unforeseen issue. we have a DI (coming from the plc) linked to the motor on system command. the problem arises when we send the DI_Motor_on signal, initially we were triggering it manually so it wasn't an issue but as we integrated it into the code the signal was then on all the time forcing the controller to reject the signal over and over (hundreds of times before i noticed) which clogged up the processor and caused many issues including the TP not reporting accurate IO and program status. we tried adding a one shot to the plc logic, but it seems to be sending the "one shot" signal too fast and the controller doesn't see it. I'm looking for some ideas on how we can go about this. how does everyone handle this part of the setup?