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  1. #31
    Quote Originally Posted by PAULRO View Post
    I thought that if i use 1 input for the limits and estop i won;t be able to reset because the m/c will be on a limit thereby inhibiting a reset. or have i got this all wrong?
    Sorry delay replying went out last night for a pint which turned into Gallon then Amnesia.!! . . Well No and yes to getting it wrong.?
    Mach as feature called Auto Limit Override which lets you Reset after Limit trip so you can Back off.

    But With the E-stop then if your combining Limits and E-stop in same circuit and using Relays for hardware driven system (which you really should be) then you will need some Limit over ride Switch to reset the Relays. If using this setup then you can use the same Relay to inform Mach e-stop Happened and then just set Limits to watch same Pin if you want. With a Hardware driven safety system all your really doing is informing software an E-stop happened so it halts the Code and won't Reset until fault cleared. The actual safety side is done by the Relays and Never should be done by software.

    Now personally I don't combine E-stop and limits because limit trip isn't an Emergency it's more positional error. I have Limits and Homes combined and limits do 2 jobs they Inform the Control limit as tripped and they disable the Enable on the drive so Motors are still locked but won't recieve signals.
    Again a Limit override button is needed if disabeling the Enables on drives. If you don't disable the drives and just Inform the control you can get away with using Mach's Auto limit override feature.
    Last edited by JAZZCNC; 27-03-2015 at 02:43 PM.

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