The way to wire an emergency stop circuit with 2 or more things that can trigger it, is to have it a normally closed circuit and every stop switch, mechanical or electronic, in series. That way when anything triggers a stop it opens the circuit, the controller senses that and stops sending motion commands, shuts off the spindle(s), pump(s) etc. What does this controller mean by "high" if "low" is grounded? If "high" is open circuit then you should be able to connect every fault sensor and a normally open E-Stop button in parallel. You'll also need to have the new control hardware and software able to be set to use a closed circuit instead of open circuit as the E-Stop condition. If "high" is something other than open circuit then things get more complicated. One may curse the engineer(s) who thought that making things more complex than open or closed was a neat idea. ;) A NC E-Stop circuit is quite fail safe because if a switch fails or a wire breaks, the circuit goes open and the machine stops. If a wire breaks in a NO circuit then the E-Stop button or sensor the broken wire goes to cannot initiate a stop. On Tuesday, December 8, 2020, 04:19:16 PM MST, Sven Wesley <svenne.d...@gmail.com> wrote: Friends,
I am in the process of refreshing a CNC that has been running in "temporary state" the last 12 years, time to give it an overhaul. I've found the magic little piece we all call 7i96. It will do magic. The servo drives have been running flawlessly and the plan is to keep them. They have a neat error/reset feature via two pins and the old parallel port BOB supports it. If one drive or an emergency stop is triggering the stop pin, all drives will be halted by the BOB. The manual for the drive says: *Error line is pin number 6 in the Main connector and is a dual purpose, bi directional line.This pin is ‘active low’, meaning that the line is normally high indicating no problems andnormal operation. The drive will stop if this pin is pulled low (grounded) by one of thesesources:EXTERNAL activation; The line can be pulled low by an external source (CNCsoftware, E-stop, etc). .... INTERNAL activation; The line is pulled low by the drive itself due to a faultcondition.* Am I totally off the chart if I wire all the drives' pin number 6 together and connect them to one of the inputs on the 7i96 and get it to stop the program with a big alert? And maybe add a mechanical switch shortcutting to ground for those panic moments? If I am not totally stupid, what would the Mesa pin config look like? All the best, Sven _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
