My opinion: If the e-stop system is so complex that its design is not simple and obvious then it is to complex to be safe.
E-stop has to be so simple it is completely foolproof and design such that if some part of it fails, like a wire comes loose then the system stops. In other words, it needs to fail-safe. A good example is that all the "enable" pins on all the motor controllers are held in the "enable" state by a power supply. So now if the supply fails or the wires connecting it fail the motors all stop. In other words the e-stop's job is to NOT stop the machine but to enable it's operations Then when you press an e-stop button the button breaks a connection. If you are using complex logic the design is to complex to be 100% safe. Ask youself, what would happen if part of the e-stop system failed or was designed wrongly? the answer has to be "all the motors stop". On Fri, Aug 9, 2019 at 4:29 PM andrew beck <andrewbeck0...@gmail.com> wrote: > Hi guys > > Just want to say thanks for the help with the e stop circuits. All the > replies were amazing > > I have all the relays working now but am stuck on classic ladder. > > I Don't actually know how to load it and do the most basic things > > Can someone show me how to start with the most basic things like actually > opening the program please. Or link me to any videos of the process > > Regards > > Andrew > > On Mon, Jul 22, 2019 at 12:30 PM Gregg Eshelman via Emc-users < > emc-users@lists.sourceforge.net> wrote: > > > Emergency Stop buttons are made so that the knob locks in when pushed and > > has to be rotated to unlock it so it can come out. Breakout boards, VFDs, > > and various other machine control equipment often has E-Stop inputs which > > can be wired in a circuit so one or more buttons can be used to stop > > everything. > > > > The easiest way to setup an E-Stop circuit is to have everything with an > > E-Stop connection require a voltage input, then wire them all in series > > with one or more stop buttons. Hit any button, it opens the circuit to > > everything. Needs no relays, no electronic circuitry (outside of the > > breakout board etc), just dead simple wire and lock open switch(es). > > You can add an enable switch to the E-Stop circuit, with a relay that's > > held closed by the E-Stop power. Then it's a 2 step process to re-enable > > the machine. Turn the E-Stop switch button to close it then press the > > enable button to close its relay. That button will also need pressed when > > starting the machine from powered off. It won't latch on if an E-Stop > > button is still locked open. > > > > On Sunday, July 21, 2019, 5:12:08 AM MDT, andrew beck < > > andrewbeck0...@gmail.com> wrote: > > I need to set up a latching relay somehow to make sure the E stop > doesn't > > turn back on until I turn it on within linuxcnc. > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
