multiple estops on separate pins

Hello,

I am running a thre axis CNC mill with stepper motors with mesa 7i76eu. I wanted to connect stepper driver alarm outputs to mesa and have them triger emergency stop. I am also planning on adding two additional Estop buttons. I wired them up but then noticed that linuxCNC setup wizard only lets me select one output as emergency stop. Is there a way I can select multiple inputs as emergency stop, or do I have to wire the buttons in parallel and connect them to one input.

There's a couple of ways, you could use the Mesa Configuration Tool or you can add the estop_latch component yourself.

JT

estop-latch is the right way to go  with these but a better way is to use joint.N.amp-fault-in IN BIT   Should be driven TRUE if an external fault is detected with the amplifier for this joint.
ref: linuxcnc.org/docs/stable/html/man/man9/motion.9.html
This will halt motion.
Your drives may also have a estop input which disables the drive on an estop.

You can use logic components such as and2 to connect multiple signals to one. But I'm not sure I see the advantage of doing so with an e-stop. Generally an e-stop loop is all in hardware, and the e-stop input to Linuxcnc is merely to inform it of the loop's state.

Drive alarms should be wired to joint.n.amp-fault in hal, not to e-stop,

tommylight wrote:

Drive alarms should be wired to joint.n.amp-fault in hal, not to e-stop,

Yes as I said. Much cleaner to maintain