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<== Date ==> <== Thread ==>

Subject: Re: Which record is the best to use?
From: "Pearson, Matthew R." <pearsonmr@ornl.gov>
To: "Ivashkevych, Oksana" <oksana@bnl.gov>
Cc: Tech-talk <tech-talk@aps.anl.gov>
Date: Wed, 11 Apr 2018 13:55:26 +0000
Hi,

> I would like to automate phasing of servomotors in Delta Tau.
> 1.      Send phasing command via asyn, wait

How is the phasing command sent to the controller? The driver should probably support this, and be able to read back the successful/unsuccessful status. 

> 2.      If Phasing successful(bit x is set), ->DONE
> 3.      If Phasing error(bit y is set),  do 1 again.
>  
> I would like to do it in the database, and not via sequencer, because it will give me a luxury of using a substitution file and repeating the same for 9 motors and looks much easier. It would be interesting to see how Delta Tau will handle several simultaneous phasing requests. 
>  

If you only want to retry a few times before giving up, then a seq or sseq record will work, something like:

record(sseq, “PhaseAndRetry”)
{
  field(DLY1, “0”)
  field(DOL1, “1”)
  field(LNK1, “DoThePhase.PROC PP”)
  field(DLY2, “1”) #Wait 1s
  field(DOL2, “1”)
  field(LNK2, “CheckThePhase.PROC PP”)
  field(DLY3, “0”)
  field(DOL3, “1”)
  field(LNK3, “DoThePhase.PROC PP”)
  field(DLY4, “1”)  #Wait 1s
  field(DOL4, “1”)
  field(LNK4, “CheckThePhase.PROC PP”)
  etc...
}


The CheckThePhase can process the ABORT field in the sseq if the phase was successful.

Alternatively, if this is a common task, the driver could handle the retries as well as sending the command and reading the status.

Cheers,
Matt



References:
Which record is the best to use? Ivashkevych, Oksana

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