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Author Topic: Motion underrun error.  (Read 1138 times)

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Motion underrun error.
« on: March 15, 2017, 07:26:26 PM »
Can someone please tell me what a "motion underrun" error is and what I might look for to correct this?  I got this 2/3 of the way through a job that was running fine and don't know what it means, so I don't know how to diagnose the problem.
Re: Motion underrun error.
« Reply #1 on: March 15, 2017, 10:19:04 PM »
It is possible for a motion controller to consume commands out of the
buffer faster than the host computer puts them into it. This is more
likely for slow computers and jobs that have lots of very short moves.

The solution in this case is to make the motion queue larger. The PMDX
plug-in defaults to a G-code motion buffer of length 250. You can edit
this using:

Config > Plug-ins > PMDX-SmartBOB and choose the Performance Settings

A larger buffer will help prevent under-run, but will also lengthen the
response time to Feed Hold and Stop commands from the console.
Steve Stallings
For PMDX product support, please use PMDX forum or direct email for quickest response. We do not use this forum as our primary product support site.