I've been having small jumps in position for a long time on my Bridgeport with my PPMC boards. Couldn't quite be sure it wasn't operator error, but it seemed to be getting more frequent. Today I had more of it, and I was really sure I didn't hit any wrong buttons or anything.
I've just replaced the encoder counter card in the PPMC, and so far it is always returning to the same coordinate. I'll have to keep checking for a while to make sure it continues to position reliably. Anyway, I had a really weird thing happen. I just swapped the card and started LinuxCNC, and when I was jogging, I noticed the jog continued after I released the keyboard jog key. Trying a few other things, I noticed the GUI was really sluggish, too. So, then I checked the show hal config parameters, to see if any tasks were running long. The hal_ppmc component was running vastly long, overrunning the whole servo thread. It was running a very steady 1.3 ms for that component only! I thought if the real time tasks overran their period, you'd get a warning, at the least! But, I didn't see a thing. (Hmm, I wonder if a thread overrun could foul up the GUI so badly that it lost the message that there was an overrun? Is that possible?) I couldn't find anything wrong with the board, put it back in, and the ppmc run time was back to normal. Must have been a dirty contact in motherboard. I'm running2.5.4 with Axis. This coordinate jumping can be really hard to find. I'd think if it happened all at once, I'd get a prompt following error. So, it must be happening a little at a time, although when I notice it, it seems to have happened all at once. It appears to have happened on all axes, and maybe happens to two axes at about the same time. Well, any comments would be welcome. Jon ------------------------------------------------------------------------------ Mobile security can be enabling, not merely restricting. Employees who bring their own devices (BYOD) to work are irked by the imposition of MDM restrictions. Mobile Device Manager Plus allows you to control only the apps on BYO-devices by containerizing them, leaving personal data untouched! https://ad.doubleclick.net/ddm/clk/304595813;131938128;j _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
