MAXnet Alarm State Under High Motor Command Load

[Jiajun Tian via Tech-talk <tech-talk at aps.anl.gov>]

Hi All,

We are using an OMS MAXnet motor controller via an EPICS IOC, with motion driven by Bluesky plans (Ophyd). Under a high rate of consecutive motor move commands, the motor PVs enter an EPICS alarm state after several moves. When this happens, Ophyd reports a failed MoveStatus, and the Bluesky RunEngine aborts.

The MAXnet is primarily connected via Ethernet. We have also observed similar behavior when using a serial connection, where the issue occurs more frequently.

Has anyone experienced similar MAXnet issues with EPICS, or can advise on relevant settings or configuration considerations?

Related error observed in Bluesky/Ophyd:

ERROR:ophyd.objects: Motion failed: sx is in an alarm state status=AlarmStatus.STATE severity=AlarmSeverity.MAJOR

Thanks in advance,

Jiajun

Jiajun Tian, Ph.D.

Postdoctoral Researcher

NSF’s ChemMatCARS, Pritzker School of Molecular Engineering

University of Chicago

9700 S Cass Ave Bldg 434D

Lemont, IL-60439

United States