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Subject: Motor module problem
From: Jörn Dreyer <j.dreyer@hzdr.de>
To: EPICS tech-talk <tech-talk@aps.anl.gov>
Date: Thu, 28 Sep 2017 10:04:08 +0200
Hello,

currently I'm working on a piezo motor driver based on the 
asynMotorController. At startup of the IOC the Axis::move command is called 
with parameters that I do not understand. If I put a printout statement at the 
beginning of the function like this:

printf("%s %d %s %f %d %f %f %f\n", "Moving axis", axisNo_+1, "to position", 
position, relative, minVelocity, maxVelocity, acceleration);

it results in:

Moving axis 1 to position inf 0 0.000000 0.000000 0.000000

The corresponding record looks like this:

record(motor, "A:m1") {
  field(DESC, "Mirror 1")
  field(DTYP, "asynMotor")
  field(DIR, "1")
  field(VELO, "110.")
  field(VBAS, ".05")
  field(ACCL, ".5")
  field(BDST, "0")
  field(BVEL, "1.0")
  field(BACC, "2")
  field(OUT, "@asyn(B,0)")
  field(MRES, "0.00001")
  field(PREC, "5")
  field(EGU, "mm")
  field(DHLM, "0.32768")
  field(DLLM, "1")
  field(INIT, "")
  field(RTRY, "5")
  field(TWV, "1")
  field(SDIS, "A:m1_able.VAL")
  field(VMAX, "190.")
}

It gets called three times, first with inf, then with DHLM, and then with 
10000. Looks like it wants to do something like homing. How can I prevent 
this?

Regards,

Jörn

Replies:
Re: Motor module problem Torsten Bögershausen

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