Hi Hood

XML attached.

Tried it and it seems to be working fine here with your xml, macropump and  same Mach version.
When does it happen? Is it as soon as the switch is activated?
Can you emulate the switch via the keyboard and see if you still get the problem as that is what I am doing.
Hood

I've tried to emulate the keyboard and did the same.
 The error does not occur immediately after the trigger microswitch or the keyboard, only after some time after retained.
 I have attached picture from the message

Just for something to try I have seen the DO act strangely in certain combinations. You may try this as a test to see if it acts  differently.

While  Isactive(Input1) = False
Code "(Pneumatico Desativado)"
Wend
  Code "(Ativado)"
  Code "M8"
  Code "G04 P2.5"
  Code "M9"
  Code "G04 P1"  
  Code "(            )"
 End

(;-) TP

Wonder if it could be due to computer load, I have had it sitting here with the macropump running and Input 1 emulated since I last posted and its been fine but its quite a powerfull computer I have here. What is the CPU load whilst the macropump is running with the emulated input? Mine just sits at 1% CPU.
Hood

I'll try to explain the issue.
 Beside the spindle has an air drill. Initially the drill is high and the microswitch is activated or INPUT # 1 is high.
 When the drill is driven by Gcode, an air piston down the drill and the microswitch is deactivated, ie, INPUT # 1 goes down.
 The drill must return to the top, microswitch trigger to HI , releasing the CNC advances to the next hole.
I hope I have explained well.

Nemo

HI BR549 , I'll try your suggestion.

Nemo

Wonder if it could be due to........................................Mine just sits at 1% CPU.
Hood

Mine show 2%.

Nemo

Just for something to try I have seen the DO act strangely in certain combinations. You may try this as a test to see if it acts  differently.
................................................................................
(;-) TP

Hi BR549
I swapped your suggested code to suit my need, and did a simulation.
 So far this has worked without problems.
......
  Code "(Ativado)"
  Code "M8"
  Code "G04 P2.5"
  Code "M9"
  Code "G04 P1"   
  Code "(            )"
While  Isactive(Input1) = False
Code "(Pneumatico Desativado)"
Wend
End

Nemo