Timer switch

[CNC1970]

Hi ,

I have a cilinder with end switch #83=1 cilinder go left wait until hit switch
but If there is no air I want an alarm as

#84=0
#83=1
WAITUNTIL #59=1:SLEEP 2:LABEL1 AIR TOO LOW;12:EXIT
-----M50

Thanks

[camsoft]

' The following routine checks to see if a prox switch is hit within 500 ms
' If not then display a message
' Change time 500 ms and I/O relay # as needed
#83=1 ' Engage air cylinder to start move
TIME RESETMS ' set millisecond time counter to zero
LOOP:
TIME MS;\55 ' read how many milliseconds has elapsed
IF \55>500 THEN LABEL1 AIR TOO LOW;12:EXIT
IF #59=0 THEN GOTO :LOOP ' if switch not hit then re-check again
' If made it here then switch was hit within 500 ms

[Karl_T]

Hey Camsoft,

I'm just curious. I would have included a SLEEP 0.025 right after the LOOP: line. The way this code is written the loop will run many 10000s of times in the time it takes to make the cylinder prox switch. My concern is this could bring the 'puter to its knees and affect something else that might be going on in inputio, limitio, or elsewhere. Sleeping for a few miliseconds really frees up computer resources. Is this at all necessary?

Karl

[camsoft]

Karl,

Putting a SLEEP in there is okay for the reason you mentioned but if you think about it, it maybe sleeping when the I/O switch is hit. If the relay was only on/off briefly it may miss it.

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