Schneider Link It

[Kahlil Algya]

HiWe are trying to link a Schneider TM251MESE plc to ignition with modbus tcp communication. We are able to create a connection between the plc and ignition, but we are unable to link the ignition tags to plc, since we cannot seem to replicate the PLC mapping with modbus addresses. We are reading zeroes for everything but the first few coils (around MODBUS address 000001). Is there anything in the Ignition gateway settings or in Ignition designer that can help us read integer values that are not zero? (i.e. from %QW03 or %IW08).

You missed my point. You cannot do this with Modbus. You will need code in the PLC to copy bit memory to word memory. Modbus word accesses cannot read bit memory. At all.

You can try a third party software like the Kepware-EX, this might get the job done, they have a 2-hour demo package. You could also try read the tags via Python. Were you able to read the tags with Modbus reader?

We've tried using KEPServerEX as our 3rd party OPC server, but we're running into the exact same problem, where we can read %QXx.x things but not holding registers or input registers. We're not sure if we are addressing them correctly (is it 040001 or 400001 for %QW1, is it 400006 or 400011 for %QW11, etc.), since we only read zeroes, but this is a minor issue.

If this is true, then it's the real problem we are facing - we want to read 'bit memory' as 'word memory', but the PLC doesn't do this automatically. It's misleading since the documentation seems to imply we can just read bit memory as words...

Or consider using bit memory (%Q) for bits and word memory (%M) for words, as Modbus' original architecture is designed to do. That will avoid the race conditions that manual implementation of Read-Modify-Write cycles suffer.

The same sort of issue happens in KEPServerEX and from Ignition Gateway where we cannot write booleans. Would anyone happen to know why? We are certain the address is correct (we can set booleans by just defining them as words and then writing the appropriate decimal number corresponding to the bit).

To my knowledge, you must specify the address in variable tables in PLC, if you want that variable to be visible on Modbus, since that address in variable table is also a Modbus address. I used word memory, which corresponds to holding registers.

The problem you have now is the same as mine, the fix is a few posts above.

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