Mapped modbus objects value issue

[admin]

And yet, variables in SCADA KNX are only updated when the value changes.

Can you explain why is this a problem? What is the point in sending the same value that has not changed? It just generates unnecessary bus load.

In the log image I sent, it shows many read attempts, which have no response, despite the objects having value.

LM won't respond to group read requests by default. It can be done via a script: https://forum.logicmachine.net/showthread.php?tid=5691

You don't need to enable poll interval for LM internal objects. This feature is used to poll other KNX device values.

Did you enable Write to bus for each mapped object in Modbus (not the device status object)?