IIRC, the e-stop through Keling, like so many others, has two pairs of contacts, one set NO, one set NC.
With the E-stop, pulled out you would want to route your g540 enable signal through the closed pair of contacts (not in E-stop is normal).
A common application of the NO contacts would be to turn on a red lamp or horn to indicate an E-stop condition when they close (or feed a discrete I/O for the controller/PLC/etc to respond or display E-stop message). |