Hi Marco,
I think I understand why you are not seeing the correct value when you use PINI=YES and SCAN=Passive. The problem is a race condition.
As I said in a previous message, it appears that you have set the MBUS_POLL macro to 1000, which means the poller for that Modbus driver is running every 1000 ms (1 second). The poller waits for this delay at the beginning of the poll loop. The poller thread
is started when your startup script calls drvModbusAsynConfigure(). When the record processes during iocInit() because PINI=YES it just gets the most recent value from the poller.
However, in your case because you have a slow polling rate of 1 second it is likely that the poller has not yet done the first poll when the record is processed during iocInit, so there is no value to use.
I believe you can fix the problem by adding this line to your startup script just before iocInit()
epicsThreadSleep(1.0)
Mark
From: Mark Rivers
Sent: Tuesday, July 26, 2022 6:37 PM
To: Marco A. Barra Montevechi Filho <marco.filho at lnls.br>; tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: RE: PINI field not working with modbus
Hi Marco,
Please start the IOC with TargetVoltRead.SCAN=Passive and .PINI=YES. Set the asynTraceMask for the NEG_EMODBUS_1_1_Rd_VTarget driver to 9, but do that immediately after you create the driver, not at the end of the startup script. Then when the startup is
complete type the following command and send the output. Also send the output of all driver trace messages that occur before you type dbpf.
dbpf TargetVoltRead 2
Of course you need to add all of the prefixes for TargetVoltRead.
Mark
From: Marco A. Barra Montevechi Filho <marco.filho at lnls.br>
Sent: Tuesday, July 26, 2022 9:10 AM
To: Mark Rivers <rivers at cars.uchicago.edu>; tech-talk at aps.anl.gov
Subject: Re: PINI field not working with modbus
Of course!
it is defined in the st.cmd as:
drvModbusAsynConfigure("NEG_EMODBUS_1_1_Rd_VTarget",
"EMODBUS",
${MBUS_SL_ADDR},${MBUS_READ},0x3000,1,0,${MBUS_POLL},
"");
I append the full st.cmd file below. I also tried to define other functions PINI to YES and FNLK to
"${BL}:${H}:${EQ}:TargetVoltRead",
but to no avail.
Any suggestions on how to improve the st.cmd are also welcome.
#!/home/marco/work/cnpem_git/LCI/NEGPowerMINI/bin/linux-x86_64/NEG
< /home/marco/work/cnpem_git/LCI/NEGPowerMINI/iocBoot/iocNEG/envPaths
epicsEnvSet("EQ","NEGPowerMINI")
epicsEnvSet("IOCNAME","NEG")
# Configuração da linha de luz
< /home/marco/work/cnpem_git/LCI/NEGPowerMINI/iocBoot/iocNEG/NEG.config
epicsEnvSet("STREAM_PROTOCOL_PATH","${TOP}/db")
## Register all support components
dbLoadDatabase "dbd/NEG.dbd"
NEG_registerRecordDeviceDriver pdbbase
drvAsynIPPortConfigure("EMODBUS","10.20.41.90:502",0,0,1)
########NOT USED ANYMORE. KEEPING FOR HISTORICAL REASONS###
# Set up ASYN HYPPIE ports
# pxiCreateSM(asyn, shared memory name)
# drvasynPXIConfig(port, COM port, shared memory name, serial type)
#asynSetOption("EMODBUS", 0, "${BAUD}", "9600")
#asynSetOption("EMODBUS", 0, "bits", "8")
#asynSetOption("EMODBUS", 0, "parity", "none")
#asynSetOption("EMODBUS", 0, "stop", "1")
###############################################################################
###############################################################################
modbusInterposeConfig("EMODBUS",0,3000,0)
# drvModbusAsynConfigure(portName, => create a name
# tcpPortName, => defined before
# slaveAddress, => defined on equipament
# modbusFunction, => 3 : Read Holding Register (16-bit)
# modbusStartAddress, => adress of register
# modbusLength, => the length of data segment
# dataType, => default data type
# plcType); => Equipament name, not used
drvModbusAsynConfigure("NEG_EMODBUS_1_1_Rd_SoftwareVersion",
"EMODBUS",
${MBUS_SL_ADDR},${MBUS_READ},
0x1000, 1, 2, ${MBUS_POLL},
"");
drvModbusAsynConfigure("NEG_EMODBUS_1_1_Rd_HardwareVersion",
"EMODBUS",
${MBUS_SL_ADDR},${MBUS_READ},0x1002,1,2,${MBUS_POLL},
"");
drvModbusAsynConfigure("NEG_EMODBUS_1_1_Rd_PowerSuppIntState",
"EMODBUS",
${MBUS_SL_ADDR},${MBUS_READ},0x2000,1,0,${MBUS_POLL},
"");
drvModbusAsynConfigure("NEG_EMODBUS_1_1_Rd_LoggingState",
"EMODBUS",
${MBUS_SL_ADDR},${MBUS_READ},0x2001,1,0,${MBUS_POLL},
"");
drvModbusAsynConfigure("NEG_EMODBUS_1_1_Rd_SysUptime",
"EMODBUS",
${MBUS_SL_ADDR},${MBUS_READ},0x2002,2,0,${MBUS_POLL},
"");
drvModbusAsynConfigure("NEG_EMODBUS_1_1_Rd_InternalTemperature",
"EMODBUS",
${MBUS_SL_ADDR},${MBUS_READ},0x2004,1,0,${MBUS_POLL},
"");
drvModbusAsynConfigure("NEG_EMODBUS_1_1_Rd_PumpTemperature",
"EMODBUS",
${MBUS_SL_ADDR},${MBUS_READ},0x2005,1,0,${MBUS_POLL},
"");
drvModbusAsynConfigure("NEG_EMODBUS_1_1_Rd_OutVolt",
"EMODBUS",
${MBUS_SL_ADDR},${MBUS_READ},0x2006,1,0,${MBUS_POLL},
"");
drvModbusAsynConfigure("NEG_EMODBUS_1_1_Rd_OutCurr",
"EMODBUS",
${MBUS_SL_ADDR},${MBUS_READ},0x2007,1,0,${MBUS_POLL},
"");
drvModbusAsynConfigure("NEG_EMODBUS_1_1_Rd_TimeRunning",
"EMODBUS",
${MBUS_SL_ADDR},${MBUS_READ},0x2008,2,0,${MBUS_POLL},
"");
drvModbusAsynConfigure("NEG_EMODBUS_1_1_Rd_Alarms",
"EMODBUS",
${MBUS_SL_ADDR},${MBUS_READ},0x200A,2,0,${MBUS_POLL},
"");
drvModbusAsynConfigure("NEG_EMODBUS_1_1_Rd_TempAlarms",
"EMODBUS",
${MBUS_SL_ADDR},${MBUS_READ},0x200C,2,0,${MBUS_POLL},
"");
drvModbusAsynConfigure("NEG_EMODBUS_1_1_Rd_WorkTime",
"EMODBUS",
${MBUS_SL_ADDR},${MBUS_READ},0x200E,2,0,${MBUS_POLL},
"");
drvModbusAsynConfigure("NEG_EMODBUS_1_1_Rd_VTarget",
"EMODBUS",
${MBUS_SL_ADDR},${MBUS_READ},0x3000,1,0,${MBUS_POLL},
"");
drvModbusAsynConfigure("NEG_EMODBUS_1_1_Wr_VTarget",
"EMODBUS",
${MBUS_SL_ADDR},${MBUS_WRITE},0x3000,1,0,${MBUS_POLL},
"");
dbLoadRecords("db/dbNEG.db",
"BL=${BL}, H=${H},
EQ=${EQ}")
Thanks for the help 🙂
Marco
Can you show us how the NEG_EMODBUS_1_1_Rd_VTarget port is configured?
Hello all.
I have an analog in record for reading a modbus register from a device. The record is defined as follows:
record(ai,
"${BL}:${H}:${EQ}:TargetVoltRead"){
field(DESC,
"Voltage set on target [V].")
field(INP,
"@asyn(NEG_EMODBUS_1_1_Rd_VTarget,0,1000)MODBUS_DATA")
}
Which reads fine. However, if i set the PINI field to YES and the scan to passive:
record(ai,
"${BL}:${H}:${EQ}:TargetVoltRead"){
field(DESC,
"Voltage set on target [V].")
field(INP,
"@asyn(NEG_EMODBUS_1_1_Rd_VTarget,0,1000)MODBUS_DATA")
}
i get only 0 as value when cagetting the PV. Am i doing something wrong?
Thanks in advance.
Marco
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