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+--- Thread: Issue with Modbus Profile – Data Not Showing on Mapped Group Address (/showthread.php?tid=6461)
Issue with Modbus Profile – Data Not Showing on Mapped Group Address - Ranjeet - 10.06.2026
I am currently integrating a LogicMachine controller with a Labtech Ultrasonic Water Meter using the attached JSON Modbus profile. The profile is configured to read Instant Flow and Total Flow values as 4‑byte floating point (float32) objects.
I have successfully tested communication through the Modbus “Read Test” tool in LogicMachine, and the correct data is being received from the meter. However, the mapped group addresses linked to this Modbus profile are not displaying the values — they remain at 0.000.
Could you please advise what might be causing this issue? Specifically, I would like guidance on whether this could be related to:
- Datatype mismatch between the Modbus profile and LogicMachine objects
- Word/byte order configuration (read_swap setting)
- Register addressing for float32 values (two registers per value)
- Scaling or multiplier settings
Thank you in advance for your support
RE: Issue with Modbus Profile – Data Not Showing on Mapped Group Address - admin - 10.06.2026
Instant Flow address should 0, not 1. Total Flow address should 2, not 3.
Post a screenshot of Read test values that work for you.
RE: Issue with Modbus Profile – Data Not Showing on Mapped Group Address - Ranjeet - 10.06.2026
(10.06.2026, 06:45)admin Wrote: Instant Flow address should 0, not 1. Total Flow address should 2, not 3.
Post a screenshot of Read test values that work for you.
Sure
I have Attached
RE: Issue with Modbus Profile – Data Not Showing on Mapped Group Address - admin - 10.06.2026
Which Address, Data type and Read swap settings have you used?
RE: Issue with Modbus Profile – Data Not Showing on Mapped Group Address - Ranjeet - 10.06.2026
(10.06.2026, 06:54)admin Wrote: Which Address, Data type and Read swap settings have you used?
Device address was 95
RE: Issue with Modbus Profile – Data Not Showing on Mapped Group Address - admin - 10.06.2026
Set Address to 0, Data type to float32, Read swap to Word (CDAB). Post what result you get when reading the value.
RE: Issue with Modbus Profile – Data Not Showing on Mapped Group Address - Ranjeet - 10.06.2026
(10.06.2026, 07:00)admin Wrote: Set Address to 0, Data type to float32, Read swap to Word (CDAB). Post what result you get when reading the value.
RE: Issue with Modbus Profile – Data Not Showing on Mapped Group Address - admin - 10.06.2026
Do you have Modbus register map documentation for your device?
RE: Issue with Modbus Profile – Data Not Showing on Mapped Group Address - Ranjeet - 10.06.2026
(10.06.2026, 07:05)admin Wrote: Do you have Modbus register map documentation for your device?
Sir,
I have only these two Document.
RE: Issue with Modbus Profile – Data Not Showing on Mapped Group Address - admin - 10.06.2026
The correct data type is int32. Try both Address 0 and 1 and Read swap Word/None until you get a value that matches the meter reading.
RE: Issue with Modbus Profile – Data Not Showing on Mapped Group Address - Ranjeet - 10.06.2026
(10.06.2026, 07:21)admin Wrote: The correct data type is int32. Try both Address 0 and 1 and Read swap Word/None until you get a value that matches the meter reading.
Done
Its Showing Now
Thanks A Lot