Part time at a small shop while I'm at school, they have a shrink wrapper from 2009 with a Micro820 and a PowerFlex 4M on the film roller. The E-stop on the front is a red mushroom into input _IO_EM_DI_05, which everyone here just calls DI05. Rung is basically:
XIC _IO_EM_DI_05 OTE Run_Seq
Press the E-stop and the sequence stops, but if the roller was running it keeps running at speed until someone hits Stop on the little panel.
I tried adding XIO _IO_EM_DI_05 into the drive start rung and an OTE to the stop output, and now the roller stops when you hit the button. But it took a program change to make the E-stop stop the motor, and that feels wrong, I think.
Sorry if this is basic, first real machine. Is that it, or what am I missing?
Which contactor drops when you hit that button? Any? Or does the E-stop only go into the PLC input and nowhere else? Look at the panel, not the program. And is there a safety relay anywhere in there, a little yellow one.
only the PLC. There's one contactor in front of the drive but it's pulled in by a Micro820 output when the machine is switched on. No yellow relay anywhere. So the button doesn't touch anything but DI05.