Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: aquanaut on October 02, 2012, 05:19:15 PM
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I have my E stop set up so that my switches are wired in series and attached to Gnd and pin 10. I'm pulling 5 volts through a 10k resistor to pin 10 on a Xylotec board. If I set pin 10 in Mach 3 to "active low" the "reset" button won't work. If I set it to active High the reset button and the limit switches work but the problem is - if a limit switch is activated I can't use "limit overide" to move the machine off the switch. It would seem that they should be set to active low so that when the voltage is interrupted they should go active and I should be able to reset them. Any ideas.
Thanks in advance for any imput you may have.
Dave
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It is much better to put limits in as limits rather than E-Stop, as you have found both work a bit differently and if you have the limits wired with and set as E-Stop you will not be able to use the limit override.
Hood
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From what I know, limit switches should not be connected to the same input pin as the E-Stop and axes with home switches should also be on separate input pins.
In my machine I have all limits / home for Y & A to one input pin, X & Z to another input pin, the E-Stop to another input pin, and the Auto Zero for the Z axis to another input pin.
To assure that all switches are assigned the correct pin I use the “Automated Setup of Inputs” from the Config Menu, Ports and Pins, Input Signals Tab. This way Mach sets all as needed and all work perfect.
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Limits can be connected in series and can all share one input and Mach will be fine.You can share the Home switches with the limits if you wish. When homing one axis will move at a time and then the next etc. When not homing the switches will be seen as limits.
Obviously the way you have it set is also fine, just it uses more inputs and previously with the parallel port you were often short of inputs.
Hood
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Good to know Hood
I thought Home switches should be on separate pins but now if I ever need a spare input pin I know what to do
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They can be but dont have to be, there is no real advantage to having them seperate at the moment unless you wish the homes not to be at the extent of the axis.
Hood
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I guess I worded that wrong in my first post. I have a switch set up at both ends of each axis. These also act as my home switches. There is also a button wired in the same series that I call my E stop button. It is all one circuit. If I set pin 10 in Mach 3 to "active low" the "reset" button won't work. If I set it to active High the reset button and the limit switches work but the problem is - if a limit switch is activated I can't use "limit overide" to move the machine off the switch.
Thanks for the response.
Dave
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What do you have set to pin 10 in Mach? Limits and Homes or E-Stop?
Hood
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Everything is set to pin 10
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Hood,
You're a genius, your last question got me thinking. I couldn't disable the E stop in Mach, so what I did was assign it to an unused pin (11) and set it to active low. Now everything works exactly like it's supposed to. Thanks everyone for your responses.
Hood, Thanks for you help, and for asking the right question.
Dave
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Glad its sorted :)
Hood
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Hood, or anyone else who might know. I'd like to be able to switch my machine from wood to Plasma and back. Where would be a good place to learn what I need to do? I know nothing about how to set up plasma
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I know nothing about how to set up plasma
That makes 2 of us ;D
Really though it shouldnt be much different from setting up any other kind of machine as far as Mach is concerned, it will all depend on whether you are planning on using a Torch Height Controller or not.
Hood