>
> Yes, Modbus doesn't seem to want to die and is handy for VFD's and
> PLC's. The point I was try to explore is why LinuxCNC has a slave
> feature as well as the master feature. VFD's and PLC's are slaves and
> provide services to LinxCNC, so why would I want to have LinuxCNC be a
> slave? This could allow two LinuxCNC PC's to talk to each other, but I
> would think there are easier ways to do this. I think the feature is
> there because it is part of the Modbus package and got a free ride. It's
> no big deal, I was just curious, but I might want to give it some
> attention if someone is actually using it.
>
> I use Modbus with VFD's and some time in the future maybe an AVR tool
> changer controller, others use it with PLC's. My plan so far is to keep
> any focus I may have on those items.
> --
As was mentioned Modbus master/slave is incorporated with Classicladder.
Version 7.100 (the first version included in EMC2) actually had Modbus in
the source - it was just turned off.
When I updated EMC2 to the 7.124 version, I decided to include it.
I personally never got the slave version to work but that is probably because
I don't understand TCP connections.
Do you connect two computers with crossover cable or must you use a router?
How do you find the address?
Marc (Classicladders creator) tells me he has tested it and it worked.
He just never supplied step by step instructions.
I can see no reason not to have a slave feature. If you have a separate computer
you could use it as a smart PLC without slowing down your main computer.
or have the second computer run windows (CL runs in windows too)
The original CL was made to be able to be included in embedded machines.
Also it would allow you to test your Modbus connection which is probably why
Marc coded it.
If you figure out how to use it please add it to the official docs.
Chris M
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