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Ouch. I swear I knew that before. Thanks a lot for your reply.

For anyone else that stumbles on this, here is what I added to my personal operations manual:

Q: Ohmic sensing is triggered early
A: This is most often caused by slag or water getting into the shield. 

With the torch shield away from anything conductive, tap the ohmic test button. If the Ohmic light comes on then the ohmic sense circuit is shorted. If you are doing test cuts on scrap, tap the Torch Pulse button to blow out any water in the shield. If that doesn't work, turn off plasma cutter and blow the tip with compressed air. If this does not work, remove shield and clean out any debris. Look for slag that is stuck to the electrode and/or shield cup. 

In the case of slag, consider increasing pierce height as this almost always happens during pierce. In the case of water, add G0 to your program to rapidly move the torch away from water being sprayed by the a torch during postflow.

Thank you for your responses.
I see now how to call another subrutine. If I'm in a running subroutine and stop it, do I have to end it (END SUB) before I call the new subrutine?

I meant "work offset".

If I am undestanding this L20 P0 would change the axis for all subroutines relative to the machine coordinates and not change the WCS offsets for each location i.e. G54...5,6,7. Is this the same as using the Axis Screen offset for P0?

Essintially the program ran the first opertion to all 4 locaions then lifted up and stopped. I want to be able to move it back to the first location and change the tool and set the Z work offset for the nest operation.

Many thanks