EPICS Controls Argonne National Laboratory

Experimental Physics and
Industrial Control System

1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  2021  2022  <20232024  Index 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  2021  2022  <20232024 
<== Date ==> <== Thread ==>

Subject: Re: Weird behaviour in wait=True when using epics.Motor.get(something,something,wait=True)
From: Mark Rivers via Tech-talk <tech-talk at aps.anl.gov>
To: Matthew Newville <newville at cars.uchicago.edu>, "Marco A. Barra Montevechi Filho" <marco.filho at lnls.br>
Cc: SWC <swc at lnls.br>, "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Date: Tue, 17 Jan 2023 17:11:47 +0000
Hi Marco,

I think there may be a complication with the motor record, and other complex records like mca, scaler, etc.  Using Python put(wait=True) means you are using ca_put_callback() in the underlying Channel Access C code.  ca_put_callback() completes when the record calls recGblFwdLink().  For those complex records recGblFwdLink() is called when the record is "done".  For the motor record that means that a move is complete, for the mca and scaler record it means acquisition is complete.  I think this means that if a move is in progress when writing to CNEN then that write will only complete when the move is complete, so it could take a long time.   

Tim Mooney may correct me if my understanding is wrong.

Mark


From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Marco A. Barra Montevechi Filho via Tech-talk <tech-talk at aps.anl.gov>
Sent: Tuesday, January 17, 2023 10:53 AM
To: Matthew Newville <newville at cars.uchicago.edu>
Cc: SWC <swc at lnls.br>; tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: Re: Weird behaviour in wait=True when using epics.Motor.get(something,something,wait=True)
 
Thanks, Matt.

In my tests, put("CNEN",value,wait=True) returns in much less than 10 seconds, so i dont think this is the case.

Something interesting: i had the same problem with VELO field so im guessing problem is with my understanding about how the IOC works in general, not an actual communication with hardware problem.

Best regards,

Marco

From: Matt Newville <newville at cars.uchicago.edu>
Sent: 17 January 2023 13:30
To: Marco A. Barra Montevechi Filho <marco.filho at lnls.br>
Cc: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>; SWC <swc at lnls.br>
Subject: Re: Weird behaviour in wait=True when using epics.Motor.get(something,something,wait=True)
 
To follow up on Torsten's comment, the default timeout for a `epics.Motor.put()` is 10 seconds.   The behavior you are seeing could be because the processing of setting CNEN takes more than that 10 seconds.   

Giving a longer timeout to the `put()` might clarify what is happening. 


On Mon, Jan 16, 2023 at 3:27 PM Marco A. Barra Montevechi Filho via Tech-talk <tech-talk at aps.anl.gov> wrote:
Good evening all.

Im working with the same IOC i was using here: https://epics.anl.gov/tech-talk/2023/msg00020.php. Now i loaded some motor records in it and am trying to control the IOC via pyepics. Something weird is happening.

i made the following python script:

import epics
a = epics.Motor("MGN:B:E873A:DIAG:X:m1")
a.put("CNEN", 1,wait=True)
assert a.get("CNEN")==1

And i frequently get assertion errors. What is happening? Shouldn't wait=True prevent this? How do i debug this?
Even more weird: i tried debugging this with callbacks:

import epics, time

a = epics.Motor(
        "MGN:B:E873A:DIAG:X:m1")

def printvalue(**kwargs):
    print(kwargs["value"])

b = epics.PV("MGN:B:E873A:DIAG:X:m1.CNEN")
b.add_callback(printvalue)

c = 1

while True:
    c=1-c
    print("#####")
    a.put("CNEN",c)
    time.sleep(0.1)
And i get prints like:

#####
1
#####
0
#####
1
0
#####

Why do i sometimes get two callbacks and sometimes get only one? Thanks in advance for any help.

I append the IOC initialization log and the substitutions file it loads:

INIT LOG:

#!/usr/local/epics/apps/pigcs2IOC/bin/linux-x86_64/pigcs2
< /usr/local/epics/apps/pigcs2IOC/iocBoot/iocPIGCS2/envPaths
epicsEnvSet("IOC","iocPIGCS2")
epicsEnvSet("TOP","/usr/local/epics-nfs/modules/R3.15.6/synApps/R6.1/support/motor-R7-1/modules/motorPIGCS2-R1-1/iocs/pigcs2IOC")
epicsEnvSet("SUPPORT","/usr/local/epics-nfs/modules/R3.15.6/synApps/R6.1/support")
epicsEnvSet("ASYN","/usr/local/epics-nfs/modules/R3.15.6/synApps/R6.1/support/asyn-R4-36")
epicsEnvSet("STREAM","/usr/local/epics-nfs/modules/R3.15.6/synApps/R6.1/support/StreamDevice-2-8-9")
epicsEnvSet("CALC","/usr/local/epics-nfs/modules/R3.15.6/synApps/R6.1/support/calc-R3-7-3")
epicsEnvSet("RECCASTER","/usr/local/epics-nfs/apps/recsync/1.4_epics_3.15/client")
epicsEnvSet("SNCSEQ","/usr/local/epics-nfs/modules/R3.15.6/synApps/R6.1/support/seq-2-2-6")
epicsEnvSet("BUSY","/usr/local/epics-nfs/modules/R3.15.6/synApps/R6.1/support/busy-R1-7-2")
epicsEnvSet("IPAC","/usr/local/epics-nfs/modules/R3.15.6/synApps/R6.1/support/ipac-2-15")
epicsEnvSet("MOTOR","/usr/local/epics-nfs/modules/R3.15.6/synApps/R6.1/support/motor-R7-1")
epicsEnvSet("EPICS_BASE","/usr/local/epics-nfs/base/R3.15.6")
cd "/usr/local/epics-nfs/modules/R3.15.6/synApps/R6.1/support/motor-R7-1/modules/motorPIGCS2-R1-1/iocs/pigcs2IOC"
## Set up environment
epicsEnvSet("DEV","MGN:B:E873A:DIAG:X:")
epicsEnvSet("BL", "MGN:B:E873A:DIAG:X")
epicsEnvSet("IOCNAME", "MGN-B-E873A-DIAG-X")
epicsEnvSet("EPICS_CA_MAX_ARRAY_BYTES",15728645)
# protocol file paths
epicsEnvSet ("STREAM_PROTOCOL_PATH", ".:/usr/local/epics-nfs/modules/R3.15.6/synApps/R6.1/support/motor-R7-1/db")
## Register all support components
dbLoadDatabase "dbd/pigcs2.dbd"
pigcs2_registerRecordDeviceDriver pdbbase
cd "/usr/local/epics-nfs/modules/R3.15.6/synApps/R6.1/support/motor-R7-1/modules/motorPIGCS2-R1-1/iocs/pigcs2IOC/iocBoot/iocPIGCS2"
## motorUtil (allstop & alldone)
dbLoadRecords("/usr/local/epics-nfs/modules/R3.15.6/synApps/R6.1/support/motor-R7-1/db/motorUtil.db", "P=MGN:B:E873A:DIAG:X:")
##
# < PI_GCS2.cmd
# PI GCS2 support
dbLoadTemplate("/usr/local/epics/apps/config/PIGCS2/e873aX.substitutions")
drvAsynIPPortConfigure("E873_ETH","CDE5B3D.abtlus.org.br:50000",0,0,0)
# Turn on asyn trace
# asynSetTraceMask("E873_ETH",0,3)
# asynSetTraceIOMask("E873_ETH",0,1)
# PI_GCS2_CreateController(portName, asynPort, numAxes, priority, stackSize, movingPollingRate, idlePollingRate)
# # this is the final setup
# PI_GCS2_CreateController("E873", "E873_ETH", 1, 0, 0, 100, 1000)
# speedup debug
PI_GCS2_CreateController("E873", "E873_ETH", 1, 0, 0, 50, 1000)
2023/01/16 18:23:03.949 read from E873_ETH: (c)2016-2020 Physik Instrumente (PI) GmbH & Co. KG, E-873.1AT, 120040762, 03.033
PIasynAxis::PIasynAxis() 0: 1
----------------- axis num: 0 createCLParams() m_szAxisName: 1-------------------
# Turn off asyn trace
# asynSetTraceMask("E873_ETH",0,1)
# asynSetTraceIOMask("E873_ETH",0,0)
# Set end-of-string terminators (port, addr, terminator)
asynOctetSetInputEos("E873_ETH", 0, "\n")
asynOctetSetOutputEos("E873_ETH", 0, "\n")
dbLoadRecords("/usr/local/epics-nfs/modules/R3.15.6/synApps/R6.1/support/motor-R7-1/modules/motorPIGCS2-R1-1/iocs/pigcs2IOC/db/PI_Support.db","P=MGN:B:E873A:DIAG:X:,R=m1:,PORT=E873,ADDR=0,TIMEOUT=1")
# asyn record for troubleshooting
dbLoadRecords("/usr/local/epics-nfs/modules/R3.15.6/synApps/R6.1/support/asyn-R4-36/db/asynRecord.db","P=MGN:B:E873A:DIAG:X:,R=asynEth,PORT=E873_ETH,ADDR=0,OMAX=256,IMAX=524288")
# RECSYNC
dbLoadRecords("/usr/local/epics-nfs/apps/recsync/1.4_epics_3.15/client/db/reccaster.db", "P=MGN:B:E873A:DIAG:X:REC:")
# protocol
#dbLoadRecords("$(MOTOR)/db/e873.db", "P=$(DEV),PORT=E873_ETH")
iocInit
Starting iocInit
############################################################################
## EPICS R3.15.6
## EPICS Base built Sep 27 2021
############################################################################


e873aX.substitutions FILE:

file "$(MOTOR)/motorApp/Db/asyn_motor.db"
{
pattern
{P,              M,     DTYP,       PORT, ADDR,      DESC,  EGU,  DIR,  VELO,  VBAS,  ACCL,  BDST,  BVEL,  BACC,  MRES,  PREC,  DHLM,  DLLM,  INIT}
{MGN:B:E873A:DIAG:X:,  "m1",  "asynMotor",  "E873",    0,  "Motor 1", mm,  Pos,    1,    0,    .1,    0,      0,    0,   0.000001,  7,     5.0,   -5.0,  ""}
}

Aviso Legal: Esta mensagem e seus anexos podem conter informações confidenciais e/ou de uso restrito. Observe atentamente seu conteúdo e considere eventual consulta ao remetente antes de copiá-la, divulgá-la ou distribuí-la. Se você recebeu esta mensagem por engano, por favor avise o remetente e apague-a imediatamente.

Disclaimer: This email and its attachments may contain confidential and/or privileged information. Observe its content carefully and consider possible querying to the sender before copying, disclosing or distributing it. If you have received this email by mistake, please notify the sender and delete it immediately.




Replies:
Re: Weird behaviour in wait=True when using epics.Motor.get(something,something,wait=True) Marco A. Barra Montevechi Filho via Tech-talk
References:
Weird behaviour in wait=True when using epics.Motor.get(something,something,wait=True) Marco A. Barra Montevechi Filho via Tech-talk
Re: Weird behaviour in wait=True when using epics.Motor.get(something, something, wait=True) Matt Newville via Tech-talk
Re: Weird behaviour in wait=True when using epics.Motor.get(something,something,wait=True) Marco A. Barra Montevechi Filho via Tech-talk

Navigate by Date:
Prev: Re: Weird behaviour in wait=True when using epics.Motor.get(something,something,wait=True) Marco A. Barra Montevechi Filho via Tech-talk
Next: Re: Weird behaviour in wait=True when using epics.Motor.get(something,something,wait=True) Marco A. Barra Montevechi Filho via Tech-talk
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  2021  2022  <20232024 
Navigate by Thread:
Prev: Re: Weird behaviour in wait=True when using epics.Motor.get(something,something,wait=True) Marco A. Barra Montevechi Filho via Tech-talk
Next: Re: Weird behaviour in wait=True when using epics.Motor.get(something,something,wait=True) Marco A. Barra Montevechi Filho via Tech-talk
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  2021  2022  <20232024 
ANJ, 17 Jan 2023 Valid HTML 4.01! · Home · News · About · Base · Modules · Extensions · Distributions · Download ·
· Search · EPICS V4 · IRMIS · Talk · Bugs · Documents · Links · Licensing ·