Re: [CAD_CAM_EDM_DRO] The 250 byte packet viz. ESTOP

John Dammeyer wrote:

>Hi Mark,
>
>If the USB dongle is receiving 250 bytes every 10mS and checks the ESTOP and
>limit switches every 40uS then even if there wasn't a immediate message to
>the PC via USB to tell it that an ESTOP occurred worst case would still be
>only 10mS.
>
>

E-stop signal to the cpu should only be a signal to say E-stop has
occured. Normally E-stops are hard wired externally, and any processor
will have nothing to do with it.

Drive(s) shutdown is all handled by the estop relay on all my retrofits,
but then at least here in the UK it's a legal requirement to do it this
way. I'd expect it's much the same elsewhere.

--
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Wayne M Weedon Email: wayne@...
Fdos Design Poole UK
Tel +44-1202-677025 Fax +44-1202-770515 Mobile: 07774 439915

Specialists in small batch & Production Mechanical/Electrical Engineering
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