Hi Kevin
I have tried both ways. Reverse Word Order checked and not checked… same bad reading
If you can get a valid reading out of a third party Modbus utility like modscan it’s usually pretty easy to figure out the correct address and settings in Ignition from there.
Got it… I will try to do that.
Thanks.
Hi Kevin, I was able to get a valid reading using the ShortBus Modbus Scanner.
Main settings:
Option "0-Based" checked
Result format: Floating Point
Any idea how could I set it to ignition ? Thanks a lot
See below:
I missed this in your original post - you are not using the right address designators.
Try 1.HRF220 and 1.HRF240, maybe plus 1, maybe with or without the reverse order.
Note the “F” in the address designating it a Float and causing the driver to read 2 registers for each value.
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Thanks a lot. It worked fine!
Using:
1.HRF<Address+1> and checked “Reverse Order”
Thanks. 
I think you can get rid of the +1 offset by turning on zero-based addressing (or turning off one-based addressing, I forget which way it is displayed) in the Modbus driver settings in Ignition.
Hi Kevin
One more time I need some help on same topic.
I have some other tags I would like to retrieve the data, previously I got some %MW tags, now it is: %I and %Q as below:
Do you know how to refer the tag address to Modbus? I0.4.7.0 or Q0.5.4.0
I read some topics as Mr PTurmel mentioned: “%QW as an HR, and the %IW as an IR. %Q is accessible as C, and %I is accessible as DI”
But I did not understand how to refer the address.
Thanks.
No, sorry, I’m not familiar with these Schneider PLCs and I do not know how they map their own addresses into Modbus tables or whether it even happens automatically or not.
OK. Thanks. When I figure out how, I will share here
Hey @tarcio.sales.
I don’t think it is possible with the Ignition Modbus driver. We always have to manually map those addresses to %M addresses. The other option is to set the racks up where they use %I and %M addresses sequentially. Hope this helps!
I dug about a bit on the Schneider site and found the M340 manual. Per that manual:
- %Mzzz => Czzz
- %MWzzz => HRzzz
- %Izzz => DIzzz
- %IWzzz => IRzzz
It wasn’t clear from the manual if those are one-based or zero-based, but from the other results in this topic, I suspect it is zero-based.
Hi @pturmel
I got it when I read your first post but what I did not understand how to map the address number
E.g:
%I0.4.9.0
You said I have to use: DIzzz but what’s the zzz ? 0490 or 0.4.9.0 or 049.0 etc… That’s my doubt! Thanks for your help.
@brandon1, thanks for your reply. I read some topics that says what you mentioned. I’d have to assign the %I to %M. I will await the Mr Pturmel’s reply to make sure it’s not possible.
However, could you please tell me how to assign the %I to %M, I’m not familiar with Schneider PLC. Thanks a lot.
I don’t know. I don’t use Schneider products. Lack of support for masked writes in current products suggest they’ve gone way downhill since my time working with Modicon processors. (Ancient history).
I gather the format with the dots is expressing rack.slot.word.bit. There must be some configuration in the PLC that associates the starting bit of an input module with a %Izzz, and the rest are sequential. The Modbus specification just uses one number, from 0 to 65535, to identify any given bit or word.
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