[Thordo]

I have a perplexing issue.

We had a brown out/power surge at our shop about a month ago due to lovely California rolling blackouts. My 4020 was running a DNC program at the time and my other machines were off. The surge fried the serial board in my slave computer and the machine is now throwing a "Too many consecutive non motion blocks" error at random times during long run DNC programs.

That error is usually reserved for 16 lines or more of code with no movement but in this case it's repeating the same movement code causing the error and the machine to stop. (see pic)

I have already replaced the serial board which restored comms with all the machines but the 4020 is the only one throwing the error. I built a new cable thinking it got fried but the problem did not resolve.

My DNC software shows the same string of code so I thought it was damaged. After uninstall, reload, and test the problem was still there. I also swapped the slave with another that we use in our other building but still no resolution.

I found a reference on another forum that said if the post processor was modified so a (note) appeared on every line it would solve the problem but that did not work either.

I'm now thinking that the comm board on the machine was fried too and is sending a bad signal back to the slave when it wants more code.

I can't find any information about this happening to others so I thought I'd throw it out here.

Thordo