TIdModBusServer: WriteRegisters gets triggered multiple times about delphi-modbus HOT 3 OPEN

• Can you post a network recording with something like, for example, Wireshark?
• Can you post the callstack for both times the handler is called?

from delphi-modbus.

Hi Jens,
you may close the issue - the PLC is sending weird data.
I apologize for the inconvenience.

To explain - the PLC is sending data even if the output registers are not ready, so it is sending "something" that is in the register at the moment. The second problem is the repetition of sending - the PLC sends the Modbus message 1-3 times in one shot, and it happens that the registers do not contain valid data for every repetition.

from delphi-modbus.

Yes, I also once had a problem with a client whose PLCs was acting like this. It's good if you're able to tell if you can trust the data you receive.

PS: I cannot close the issue, I am not the repo owner, just a user like you 😉

from delphi-modbus.