Rodrigo Vieira Batista

Great, I didn't know that the outputs are mapped to Modbus in M221.

> What's strange is that I changed Q0.4 with Q0.5 and still coil 41 is changing it's value accordingly with Q0.5 value. Shouldn't have been another address instead of 41?...

@IonuDragomir1 the issue is related to the hardware found M221 function code list.  Believe that this issue can be closed.

> @rvbatista thanks for the reply! > So the only way to read coil's status is to transfer its value to a %M internal bit and read it on FUXA....

Unfortunatelly Modbus specification don't specify this kind of information. What I already saw in some softwares is to have IEC61131-3 (%M, %MW addressing), index (0-65535) and 'legacy' (0000x, 1000x, 4000x,...

Do you know why Modbus pool is showing -- for two registers? Are you able to use Wireshark with both?

The device is answering with different lengths for the same request? Could you also get the Wireshark requests for those answers?

ModbusRTU should be used for serial communication from the server, and RTUoverTCP should be used with serial device using transparent gateway. I have to check if there is some kind...

Hello, thanks for your issue. Are you able to test both conditions with Wireshark capturing the packages?

What are your modbus server? The reading is working? The usage of write multiple registers is in fact bad for efficiency, but it should work if your server have it...