Thanks for the advice Chris. I think what I'm actually asking is how to connect up the classic ladder stuff to make the gui e stop and the external big red button work together.
So that way the machine goes into estop mode if the computer discovers a fault and also if I push the E stop in. I want something like Sam's big machine. But am stuck with a couple of simple things I think. It would be so nice if someone made a quick video for that. I have classic ladder working now but am struggling with how to interface with the Hal layer. I understand a bit about Hal now but have some gaps in my understanding which are holding me up Regards Andrew. On Sat, Aug 10, 2019, 5:00 PM Chris Albertson <albertson.ch...@gmail.com> wrote: > 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 > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
