AW: problem reading data from PLC

["Blomley, Edmund \(IBPT\) via Tech-talk" <tech-talk at aps.anl.gov>]

Hey,

 

in my experience errors like this point to an issue with either the PLC address itself (not valid/correct) or the PLC configuration. I am no expert on the PLC side of things, but if I remember correctly there are settings on the PLC both in general and on a channel level to allow/deny read or write access using s7nodave.

 

Cheers

 

 

Von: Tech-talk <tech-talk-bounces at aps.anl.gov> Im Auftrag von Abhishek Dutta via Tech-talk
Gesendet: Freitag, 4. August 2023 12:45
An: s7nodave-maintainer at oss.aquenos.com; tech-talk at aps.anl.gov
Betreff: problem reading data from PLC

 

Sir,

 

I've been trying to establish communication with S7 1500 PLC. Trying to read IW0, MD0.

 

While starting the IOC, I don't get any syntax error etc. The message shows following:

 

#!../../bin/linux-x86_64/myS7

< envPaths

epicsEnvSet("IOC","iocmyS7")

epicsEnvSet("TOP","/ics/tools/myS7")

epicsEnvSet("ASYN","/ics/tools/asyn4-38")

epicsEnvSet("S7NODAVE","/home/training/Desktop/ics/tools/s7nodave-3.0.2")

epicsEnvSet("EPICS_BASE","/ics/tools/base-7.0.6")

epicsEnvSet("ETHER_IP","/ics/tools/ether_ip")

epicsEnvSet("SNCSEQ","/ics/tools/seq-2.2.9")

epicsEnvSet("AUTOSAVE","/ics/tools/autosave-R5-10-2")

epicsEnvSet("STREAM","/ics/tools/StreamDevice-master")

epicsEnvSet("BUSY","/ics/tools/busy-1-6-1")

epicsEnvSet("PVXS","/ics/tools/pvxs")

epicsEnvSet("PYDEVICE","/ics/tools/PyDevice-R1.1.1")

cd "/ics/tools/myS7"

## Register all support components

dbLoadDatabase "dbd/myS7.dbd"

myS7_registerRecordDeviceDriver pdbbase

#var mySubDebug 1

#traceIocInit

cd "/ics/tools/myS7/iocBoot/iocmyS7"

## Load record instances

#dbLoadTemplate "user.substitutions"

#dbLoadRecords "user.db"

< hall.cmd

s7nodaveConfigureIsoTcpPort("HallPLC","192.168.0.1",0,1,0)

s7nodaveConfigurePollGroup("HallPLC",'default',1.0,0)

s7nodaveConfigurePollGroup("HallPLC",'fast',0.1,0)

dbLoadRecords "hall1.db"

iocInit

Starting iocInit

############################################################################

## EPICS R7.0.6

## Rev. 2021-09-28T15:27-0400

############################################################################

iocRun: All initialization complete

## Start any sequence programs

#seq sncExample, "user=training"

epics> 2023/08/01 21:01:20.281 HallPLC error while reading 2 bytes from PLC address IB0.

2023/08/01 21:01:20.283 HallPLC error while reading 4 bytes from PLC address FB0.

 

 

IOC name is myS7 and following is the hall1.db file. It resides in the same st.cmd directory:

 

record(ai, "hall_ip1")

{

      field(SCAN,"1 second")

      field(DTYP,"s7nodave")

      field(INP, "@HallPLC(DLV=0,DHV=27648) IW0 int16")

      field(EGU,"V")

}

 

record(ai, "hall_uvolt")

{

      field(SCAN,"1 second")

      field(DTYP,"s7nodave")

      field(INP, "@HallPLC MD0 float")

      field(EGU,"V")

}

 

Please suggest solution for the same.

 

Regards,

 

अभिषेक दत्ता/Abhishek Dutta
परिवर्ती ऊर्जा साइक्लोट्रॉन केन्द्र/Variable Energy Cyclotron Center
ईमेल/e-mail: abhishek.d at vecc.gov.in

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