RE: fanout is not working

["Pearson, Matthew via Tech-talk" <tech-talk at aps.anl.gov>]

Hi,

 

As Mark mentioned, there may be a different issue, but it’s hard to say without more information.

 

When loading the IOC database, are there any errors?

 

I did test my database snippet, and it works fine for 3 motors (3 simulation motors) that are in a different IOC. I did have a typo (no quote after the name of the first dfanout record).

 

If you set the TPRO field of the top ao record to 1, then try sending a new position, you should see the 3 records processing in the IOC shell output, something like:

 

dbProcess of 'dist'

dbProcess of 'dist_fanout'

dbProcess of 'dist_go'

 

If that seems to be working, but the motors in the other IOC are not moving, there may be a channel access issue. Is there any activity at all for the 3 motors? Ie. is TWV set, but then TWF fails to cause motion?

 

Cheers,

Matt

 

From: Mark Rivers <rivers at cars.uchicago.edu>
Sent: Wednesday, November 1, 2023 3:03 PM
To: Tran, Phi Dung <ptran1 at bnl.gov>; Pearson, Matthew <pearsonmr at ornl.gov>; Goetze, Kurt A. <goetze at anl.gov>
Cc: Tech-talk <tech-talk at aps.anl.gov>
Subject: [EXTERNAL] RE: fanout is not working

 

Ø  I received the following message in EPICS: "CA client library is unable to contact CA repeater after 50 tries." I believe this issue is the root of my problem, as I am attempting to create a different virtual IOC to control motors located in another existing IOC.

 

That is not your problem.  CA repeater is needed only to see beacon messages when an IOC restarts, etc.  I makes your client reconnect quicker under those circumstances, but is not required for normal function.

 

Mark

 

 

From: Tech-talk <tech-talk-bounces at aps.anl.gov> On Behalf Of Tran, Phi Dung via Tech-talk
Sent: Wednesday, November 1, 2023 1:49 PM
To: Pearson, Matthew <pearsonmr at ornl.gov>; Goetze, Kurt A. <goetze at anl.gov>
Cc: Tech-talk <tech-talk at aps.anl.gov>
Subject: Re: fanout is not working

 

Hi Matt,

 

After implementing the changes you suggested and it is still not working.   I received the following message in EPICS: "CA client library is unable to contact CA repeater after 50 tries." I believe this issue is the root of my problem, as I am attempting to create a different virtual IOC to control motors located in another existing IOC.  Should I just add your suggestions into the existing ioc so it does not need to search globally for the motor PV.

 

 

Please advice

Phi

 

 

---

From: Pearson, Matthew <pearsonmr at ornl.gov>
Sent: Wednesday, November 1, 2023 10:40 AM
To: Tran, Phi Dung <ptran1 at bnl.gov>; Goetze, Kurt A. <goetze at anl.gov>
Cc: Tech-talk <tech-talk at aps.anl.gov>
Subject: RE: fanout is not working

 

Hi Phi,

 

I changed TWV to REL and used caput to test each motor separately since I want to make relative motions. 

 

I’m not sure I understand that. TWV is a number (the relative distance to move).

 

I just added DOL into my fanout field but it did not work either. 

 

Using the DOL field also requires setting the OMSL to “closed_loop”.

 

If you want to move all 3 motors the same relative distance, the way I’d do this is something like:

 

record(ao, “relative_dist”) {

  field(OUT, “relative_dist_fanout PP”)

}

 

record(dfanout, “relative_dist_fanout) {

  field(OUTA, “motor1.TWV”)

  field(OUTB, “motor2.TWV”)

  field(OUTC, “motor3.TWV”)

  field(FLNK, “relative_dist_go”)

}

 

record(dfanout, “relative_dist_go”) {

  field(VAL, “1”)

  field(OUTA, “motor1.TWF PP”)

  field(OUTB, “motor2.TWF PP”)

  field(OUTC, “motor3.TWF PP”)

}

 

Cheers,

Matt

 

 

---

From: Pearson, Matthew <pearsonmr at ornl.gov>
Sent: Wednesday, November 1, 2023 9:59 AM
To: Goetze, Kurt A. <goetze at anl.gov>; Tran, Phi Dung <ptran1 at bnl.gov>
Cc: Tech-talk <tech-talk at aps.anl.gov>
Subject: RE: fanout is not working

 

Hi,

 

Are you sure writing the position to $(M).TWF actually works with caput? Normally TWF (and TWR) just accept a ‘1’ to initiate a relative move specified by the distance in TWV. If the 3 motors are moving, they may just be moving a TWV relative distance.  

 

What you may want is this instead?

 

record(dfanout, "$(P)-F") {

    field(DESC, "move ib,ob,ds MTR")

    field(OUTA, "$(OUTBOARDMTR) PP MS")

    field(OUTB, "$(INBOARDMTR) PP MS")

    field(OUTC, "$(DOWNSTREAMMTR) PP MS")

 

Cheers,

Matt

 

 

From: Tech-talk <tech-talk-bounces at aps.anl.gov> On Behalf Of Goetze, Kurt via Tech-talk
Sent: Tuesday, October 31, 2023 1:48 PM
To: Tran, Phi Dung <ptran1 at bnl.gov>
Cc: Tech-talk <tech-talk at aps.anl.gov>
Subject: [EXTERNAL] RE: fanout is not working

 

Hi Phi,

 

You’re close, but I don’t think you can poke the motor record’s value into the dfanout that way.

 

One way you could do it is by processing the motor record, FLNK the motor record to the dfanout, and have the dfanout’s .DOL field set to the motor record’s .VAL field (NPP).  That may not be the exact solution but that’s the direction I would head.

 

Kurt

 

 

From: Tech-talk <tech-talk-bounces at aps.anl.gov> On Behalf Of Tran, Phi Dung via Tech-talk
Sent: Tuesday, October 31, 2023 11:31 AM
To: tech-talk at aps.anl.gov
Subject: fanout is not working

 

Hi,

 

I have created a virtual motor and can successfully use the `caput` and `caget` commands to set and read its value, respectively. However, my `dfanout` record is not moving the motors with relative motions as expected. I have confirmed that the motors respond correctly when I use `caput` to directly interact with the fields in `dfanout`.

 

record(motor, "$(P)"){

      field(DTYP, "Soft Channel")

      field(DESC, "Move Y,ib,ob,ds mtrs")

 

      # Where to write the setpoint to

      # Output to upstream, inboard and outboard motors

      field(OUT, "$(P)-F PP MS")

      field(PREC,"7")

....}

 

#Move Y motors ib,ob,ds in same direction

record(dfanout, "$(P)-F") {

    field(DESC, "move ib,ob,ds MTR")

    field(OUTA, "$(OUTBOARDMTR).TWF PP MS")

    field(OUTB, "$(INBOARDMTR).TWF PP MS")

    field(OUTC, "$(DOWNSTREAMMTR).TWF PP MS")

    field(PREC, "7")

 

Please advice.

Thank you,

Phi