On Saturday 10 August 2019 01:21:39 andrew beck wrote: > 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 > See "man iocontrol", and "man motion". There you will find the names of the hal "pins" you will need to "net" from the e-stop circuitry. I would make a further recommendation that if axis drivers are disabled, I'd put a 50 millisecond delay in the driver disable signal path to give the rest of the machine time for motion to actively stop it, otherwise it could coast and do even more damage.
> 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 Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
