I am using the CARS modbus device support with a WAGO I/O System (controller 750-341)
One thing I am having trouble getting to work is output record initialization. This is an old version of modbus support R1-2, asyn R4-9, base R3.14.9
Specifically, for modbus function code 6 I create a block
# Write 1 register, Function code=6
drvModbusAsynConfigure("WAGO_OUTS", "WAGO", 6, 0, 4, 0, 1, "WAGO_750_341")
There are four analog output records attached to this block which look like
record(ao,"wagoTest_out_0") {
field(DTYP,"asynInt32")
field(OUT, "@asynMask(WAGO_OUTS 0 -16 1000)")
field(LINR,"LINEAR")
field(EGUL,"-10")
field(EGUF,"10")
field(LOPR,"-10")
field(HOPR,"10")
field(PREC, "3")
}
When the IOC starst up only the first of the four records is initialized with the value currently in the controller.
All four records show UDF = 0, the second has a non-zero but incorrect value, the third and fourth have the value zero.
Thanks for you advice.
John Dobbins
Cornell University
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- RE: CARS modbus output record initialization Mark Rivers
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