Experimental Physics and
Industrial Control System

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

Subject:	Weird behaviour in wait=True when using epics.Motor.get(something,something,wait=True)
From:	"Marco A. Barra Montevechi Filho via Tech-talk" <tech-talk at aps.anl.gov>
To:	"tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Cc:	SWC <swc at lnls.br>
Date:	Mon, 16 Jan 2023 21:26:56 +0000

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:

#####

#####

#####

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)

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, ""}

}

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Replies:: Re: Weird behaviour in wait=True when using epics.Motor.get(something,something,wait=True) Torsten Bögershausen via Tech-talk; Re: Weird behaviour in wait=True when using epics.Motor.get(something, something, wait=True) Matt Newville via Tech-talk

Navigate by Date:: Prev: How to use epicsThreadSetCPUaffinity in epics 7.0.4 김대영 via Tech-talk; Next: Re: Weird behaviour in wait=True when using epics.Motor.get(something,something,wait=True) Torsten Bögershausen 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 <2023> 2024
Navigate by Thread:: Prev: Re: How to use epicsThreadSetCPUaffinity in epics 7.0.4 Ralph Lange via Tech-talk; Next: Re: Weird behaviour in wait=True when using epics.Motor.get(something,something,wait=True) Torsten Bögershausen 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 <2023> 2024

ANJ, 18 Jan 2023

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System