My axis limit switches are hooked directly into the estop loop.  I have 
soft limits setup.  The only time I have ever run into the over-travel 
limits was when I was jogging before homing (not paying attention... )  
(and yes - I have to back off the limit manually)

sam
On 2/12/2013 9:07 AM, andy pugh wrote:
> On 12 February 2013 14:53, Pete Matos <[email protected]> wrote:
>> Thanks for the info...can you explain that last part 7i77 GPIO?
> The 7i77 has 32 inputs and 16 outputs for general-purpose IO. (on TB7
> and TB8 I think).
>
>>   Did I hear you correctly when you said you wired your limits and
>> homes in series and in with the estop circuit?
> No, as you say that would cause problems with backing off of a limit switch.
>
> In actual fact the machine I am describing doesn't yet have limit
> switches, it is a bit of a slow-burning project. They are likely to be
> added fairly soon, though.
> However, my intention is to keep them entirely software-controlled. I
> would be interested to hear opinions on the advisability of this.
>


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