Experimental Physics and
Industrial Control System

Mark Rivers <[email protected]> · Fri, 27 Jan 2017 11:50:50 +0000

Hi Zhefu,

> dbLoadRecords("../../db/ssrfdb/RPmodbus.db","RPNAM=DCLS:RP:Gamma:01, PORT=RD1R,  paraWDPORT=parawrite1,  timeWDPORT=timewrite1")
> This is the db that I try to write Hour to device:

> record(ao, "$(RPNAM):HourValSET"){
>    field(DTYP,"asynInt32")
>    field(OUT, "@asyn($(PORT), 68)")
>    field(SCAN,"Passive")
>}

You are using the wrong port in HourValSET record.  The line should be

field(OUT, "@asyn($( timeWDPORT), 68)")

Port $(PORT) was assigned to RD1R which is Modbus function 3.

Mark

________________________________
From: [email protected] [[email protected]] on behalf of lzf neu [[email protected]]
Sent: Thursday, January 26, 2017 11:34 PM
To: Eric Norum; [email protected]
Subject: 答复: Questions about set parameters to device by using epics

Firstly, thanks for your respond !

But the problem still exists, let me describe it in details.

The modbus version is R1-2(very old version).

And the contents of st.cmd file are posted in the following:

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

< envPaths

dbLoadDatabase("../../dbd/modbus.dbd")
modbus_registerRecordDeviceDriver(pdbbase)

# Use the following commands for TCP/IP

#read   Device ID 2
drvAsynIPPortConfigure("AGM16-007",   "192.168.1.241:502",0,1,1)
modbusInterposeConfig("AGM16-007",  2,0,2000)

# Read 100 words (1600 bits).  Function code=3.
drvModbusAsynConfigure("RD1R",   "AGM16-007",  3, 0, 95, 0, 1130, "rpDevice")

# Write 8 words (128 bits).  Function code=16
drvModbusAsynConfigure("parawrite1", "AGM16-007", 16, 48, 8, 0, 10000, "rpDevice")
drvModbusAsynConfigure("timewrite1", "AGM16-007", 16, 64, 7, 0, 10000, "rpDevice")

#
dbLoadRecords("../../db/ssrfdb/RPmodbus.db","RPNAM=Gamma:01, PORT=RD1R,  paraWDPORT=parawrite1,  timeWDPORT=timewrite1")

iocInit

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

After running, epics displays the following errors during its initialization:

2017/01/27 12:55:21.149 drvModbusAsyn::doModbusIO port parawrite1 is disconnected

Here is the whole messages:

[rp@localhost iocTest]$ ./test.cmd
#!../../bin/linux-x86_64/modbusApp
< envPaths
epicsEnvSet("ARCH","linux-x86_64")
epicsEnvSet("IOC","iocTest")
epicsEnvSet("TOP","/home/rp/epicswork/modbusR1-2")
epicsEnvSet("EPICS_BASE","/home/rp/epics/base-3.14.12.5")
epicsEnvSet("ASYN","/home/rp/epics/modules/asyn-4.9")
epicsEnvSet("GENSUB","/home/rp/epics/modules/genSubV1-6")
dbLoadDatabase("../../dbd/modbus.dbd")
modbus_registerRecordDeviceDriver(pdbbase)
# Use the following commands for TCP/IP
#read   Device ID 2
drvAsynIPPortConfigure("AGM16-007",   "192.168.1.241:502",0,1,1)
modbusInterposeConfig("AGM16-007",  2,0,2000)
# Read 100 words (1600 bits).  Function code=3.
drvModbusAsynConfigure("RD1R",   "AGM16-007",  3, 0, 95, 0, 1130, "rpDevice")
# Write 8 words (128 bits).  Function code=16
drvModbusAsynConfigure("parawrite1", "AGM16-007", 16, 48, 8, 0, 10000, "rpDevice")
2017/01/27 12:55:21.149 drvModbusAsyn::doModbusIO port parawrite1 is disconnected
drvModbusAsynConfigure("timewrite1", "AGM16-007", 16, 64, 7, 0, 10000, "rpDevice")
###
dbLoadRecords("../../db/ssrfdb/RPmodbus.db","RPNAM=DCLS:RP:Gamma:01, PORT=RD1R,  paraWDPORT=parawrite1,  timeWDPORT=timewrite1")
iocInit
Starting iocInit
############################################################################
## EPICS R3.14.12.5 $Date: Tue 2015-03-24 09:57:35 -0500$
## EPICS Base built Jan 25 2017
############################################################################
iocRun: All initialization complete
epics>

Now I can read data from device, but the problem is I cannot set parameters to device.

for example, I can read Hour from device in addr 68, but i cannot write new hour to device using the db.

This is the correct db that read Hour from device:

record(ai, "$(RPNAM):HourVal"){
    field(DTYP,"asynInt32")
    field(INP, "@asynMask($(PORT) 68 16)MODBUS_DATA")
    field(SCAN,"Passive")
    field(FLNK, "$(RPNAM):WeekVal")
}

This is the db that I try to write Hour to device:

record(ao, "$(RPNAM):HourValSET"){
    field(DTYP,"asynInt32")
    field(OUT, "@asyn($(PORT), 68)")
    field(SCAN,"Passive")
}

by typing the command to set new hour value '15':

caput Gamma:01:HourValSET 15

The error message displays in the following:

epics> 2017/01/27 12:56:04.314 drvModbusAsyn::writeInt32 port RD1R invalid request for Modbus function 3
2017/01/27 12:56:04.314 DCLS:RP:Gamma:01:HourValSET devAsynInt32 process error

Any suggestions and many thanks in advance !

Zhefu

________________________________
发件人: Eric Norum <[email protected]>
发送时间: 2017年1月26日 17:57
收件人: lzf neu
抄送: [email protected]
主题: Re: Questions about set parameters to device by using epics

You need to specify a MODBUS output function code ― function code 6 to write a single holding register, function code 16 to write multiple holding registers.  Here re a couple examples

drvModbusAsynConfigure("eps1_io", "epsPLC_1", 0, 6, 16000,   1, 0, 1000, "Wago")
drvModbusAsynConfigure("eps1_ao", "epsPLC_1", 0,16, 17216,  54, 0, 1000, "Wago”)

On Jan 26, 2017, at 9:42 AM, lzf neu <[email protected]<mailto:[email protected]>> wrote:

Hi,

Below is the correct db that can read hour from the device:

record(ai, "$(RPNAM):HourVal"){
    field(DTYP,"asynInt32")
    field(INP, "@asynMask($(PORT) 68 16)MODBUS_DATA")
    field(SCAN,"Passive")
    field(FLNK, "$(RPNAM):WeekVal")
}

now, I want to set new hour to the device and I try to write the following db according to Analog Output Example Record from "asynDriver: Asynchronous Driver Support" manual:

record(ao, "$(RPNAM):HourValSET"){
    field(DTYP,"asynInt32")
    field(OUT, "@asyn($(PORT), 68)")
    field(SCAN,"Passive")
}

however, I failed, epics gives the following error messages:

drvModbusAsyn::writeInt32 port RD1R invalid request for Modbus function 3

Gamma:01:HourValSET devAsynInt32 process error

Could anyone give me some suggestions and thanks in advance !

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System