Hi All,
I am using a Wago PLC and Epics asyn-R4-43/Modbus R3-2, and I am seeing some differences in the FC2 reads depending on the Wago module that is used.
If the 750-400/500 series module DO/DI are used, the reads come back as expected, but if the 750-1400/1500 series are used there is a bit swap when reading.
Here is my current Asyn port configuration, I have tried the different data types as enums and strings but that doesn't change anything.
I can make it work, just trying to understand why I get the bit swap when using different modules on the PLC.
Here is my config:
cmd file:
# Bit read access, Function code 2
drvModbusAsynConfigure("FC2", "sim1", 0, 2, 0, 32, 0, 100, "Wago")
and the db record
# bi record template for register inputs
record(bi,"$(P)$(R)") {
field(DTYP,"asynUInt32Digital")
field(INP,"@asynMask($(PORT) $(OFFSET) 0x1)")
field(SCAN,"$(SCAN)")
field(ZNAM,"$(ZNAM)")
field(ONAM,"$(ONAM)")
field(ZSV,"$(ZSV)")
field(OSV,"$(OSV)")
}
and my substitutions file:
# READ COILS - FUNCTION CODE 2
# Reads WAGO MB Output Bits
file "$(MODBUS)/db/bi_bit.jeff.template" { pattern
{P, R, PORT, OFFSET, ZNAM, ONAM, ZSV, OSV, SCAN}
{SIM1:, FC2_0, FC2, 0, Low, High, NO_ALARM, MAJOR, "1 second"}
{SIM1:, FC2_1, FC2, 1, Low, High, NO_ALARM, MAJOR, "1 second"}
{SIM1:, FC2_2, FC2, 2, Low, High, NO_ALARM, MAJOR, "1 second"}
{SIM1:, FC2_3, FC2, 3, Low, High, NO_ALARM, MAJOR, "1 second"}
{SIM1:, FC2_4, FC2, 4, Low, High, NO_ALARM, MAJOR, "1 second"}
{SIM1:, FC2_5, FC2, 5, Low, High, NO_ALARM, MAJOR, "1 second"}
{SIM1:, FC2_6, FC2, 6, Low, High, NO_ALARM, MAJOR, "1 second"}
{SIM1:, FC2_7, FC2, 7, Low, High, NO_ALARM, MAJOR, "1 second"}
{SIM1:, FC2_8, FC2, 8, Low, High, NO_ALARM, MAJOR, "1 second"}
{SIM1:, FC2_9 FC2, 9, Low, High, NO_ALARM, MAJOR, "1 second"}
{SIM1:, FC2_10, FC2, 10, Low, High, NO_ALARM, MAJOR, "1 second"}
{SIM1:, FC2_11, FC2, 11, Low, High, NO_ALARM, MAJOR, "1 second"}
{SIM1:, FC2_12, FC2, 12, Low, High, NO_ALARM, MAJOR, "1 second"}
{SIM1:, FC2_13, FC2, 13, Low, High, NO_ALARM, MAJOR, "1 second"}
{SIM1:, FC2_14, FC2, 14, Low, High, NO_ALARM, MAJOR, "1 second"}
{SIM1:, FC2_15, FC2, 15, Low, High, NO_ALARM, MAJOR, "1 second"}
}
