I own the exact same VMC from Leadwell. Maybe I can help. I will check my manuals to see if I can come up with some answer. We should get in touch to exchange ideas. I recently bought a servo controller (MDS-A-SVJ06) on ebay. I am going to try to attach my indexing table directly to the controller instead of the separate control box that came with it;
But coming back to your issue. The current ATC position should be a register BYTE in the PLC in my language we call it a remanent marker. In other words something that is stored in non-volatile memory or backed up RAM. I am not sure if the actual address is referred to in the 9001 macro but it should be in the PLC program and one should be able to initialize it. I will look into it when I get back to my shop and will get back to you later.