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M66 works in the very same manner on Linux CNC, BTW. So Mach 4 isn't the only device/controller in the world that works like that. I don't want people getting the idea that M66 is just junk and doesn't do what it is meant to do. It works exactly as advertised. M66 does work best with industrial so that conditional G code can be use to check for a timeout. But failing that, writing your own m166.mcs is good means of not requiring the G code conditional statements. 
Guest
function m3()
local inst = mc.mcGetInstance('M3')
mc.mcCntlSetLastError(inst, 'Going into the loop')
local state = 0
local rc = mc.MERROR_NOERROR
local loopCondition = 1
state, rc = mc.mcCntlGetState(inst)
while (loopCondition == 1) and (state ~= mc.MC_STATE_IDLE) do
wx.wxMilliSleep(10) -- Sleep for 10 milliseconds
state, rc = mc.mcCntlGetState(inst)
end
mc.mcCntlSetLastError(inst, 'Broke out of the loop.')
end
if mc.mcInEditor() == 1 then
m3()
end
And I've also interlocked the CycleStart to the axis being HOMED like most industrial equipment would be. Can't start a program legitimately without actually knowing where the machine is. Unless you want to rip off a robot arm, demolish a fixture, or do something else that should end up on YouTube as an example of what not to do.Mach is designed to run with as little modification as possible on as many machines as possible. We simply cannot make a configuration that covers every machine. So it is up to the machine integrator (you) to make it work how you want it to work if you want something different than our defaults. If you want it more industrial, then we give you the tools to make that happen. That said, there are lots of examples with auto homing (PMC objects and LUA scripts) to help in that goal. I really like using the PMC to do tasks like this as it doesn't require any scripting. There is also an option in the general tab of the configuration dialog that lets you select if you want the axes to be dereferenced in e-stop. Believe it or not, we have a lot of customers that don't even have home switches. All machines are different unless you are an OEM that is building lots of the same models. For instance, my machine, once homed, will not lose position even if you hit e-stop. I can reference the machine once when I turn it on and never have to reference it again until I turn it off. If it homed every time I pressed Cycle Start after e-stop (I have no Cycle Stop button on it), I'd lose my mind! And we have machines with absolute encoders that never need homing. So we have to be able to cover a wide gambit of machines.
local state = 0
local rc = mc.MERROR_NOERROR
local loopCondition = 1
state, rc = mc.mcCntlGetState(inst)
while (loopCondition == 1) and (state ~= mc.MC_STATE_IDLE) do
wx.wxMilliSleep(10) -- Sleep for 10 milliseconds
state, rc = mc.mcCntlGetState(inst)
end
local inst = mc.mcGetInstance(inst, 'Trying to do the impossible script')
local lineNumber = 12 -- the G code line you want to jump to. It is base one, so 12 is line 12 and not line 13.
local rc = mc.MERROR_NOERROR
local state = 0
rc = mc.mcCntlCycleStop(inst)
-- Wait until the machine state is idle.
state, rc = mc.mcCntlGetState(inst)
while (rc == mc.MERROR_NOERROR) and (state ~= mc.MC_STATE_IDLE) do
wx.wxMilliSleep(10) -- Sleep for 10 milliseconds
state, rc = mc.mcCntlGetState(inst)
end
rc = mc.mcCntlSetGcodeLineNumber(inst, lineNumber)
if (rc == mc.MERROR_NOERROR) then
-- We got the proper return code from the API
-- telling us that there are no errors.
rc =mc.mcCntlCycleStart(inst)
if (rc ~= mc.MERROR_NOERROR) then
-- Some error happened.
end
-- if the code path gets here, the machine SHOULD be in File Running mode.
-- However, it is a good idea to check for the idle state at the end of any M code macro.
-- This lets you catch any action a user may have taken to stop the machine while the M code was running. E-Stop or Cycle Stop, etc...
state, rc = mc.mcCntlGetState(inst)
if rc == mc.MERROR_NOERROR) and (state == mc.MC_STATE_IDLE) then
-- The user must have aborted the G code!!!!! You can handle this gracefully if you needed to here.
end
end