Here are the very basic things to answer:
Do you have the tool length in the tool table?
Did you put that tool into the spindle with an M6?
The correct Tool pocket number has to show on the CNC or it won't register the length.
You don't use an H word to activate tool lengths on an A850 like a Fanuc does.
Remember, for the A850, the tool length in the table is very close to the length you'd measure from spindle face to tool tip with a scale.