>
> There is a ModBus feature in Classic Ladder, but it seems to me that an
> HAL component specifically for the ModIO peripheral would be useful.
> ModBus may be a standard, but peripherals that use ModBus vary widely.
>
Modbus is avaiable in Classicladder 7.124 in CVS right now and will be included
in EMC 2.3 in the future.
Modbus master is configurable as to slave number and type of registers it can
read/write.
You can poll multiply devices then add logic through classicladder or send them
directly to Classicladder's Halpins.
I have tested it using a serial port to run a VDF on my lathe. worked great ( I
haven't tried rigid tapping etc my lathe is not done)
though it is a userspace program it had no problems with communication I set
the VDF to not error with a short lapse in communication.
It can also use TCP but I have not tested this (though the modbus routines are
the same just communication protocol difference)
It can also be used as a slave but only for TCP (I have not tested this) my
intention is to write routines for the serial port eventually.
If anyone has tried it I would like to hear comments about success, problems,
and suggestions. The nice thing is there already is a GUI written to configure
modbus registers though It could be ore user friendly. If I hear about interest
I will spend more time on it.
Cheers
Chris Morley
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