OPTA with Arduino PLC IDE first steps

Projects General Guidance
1

Hi, I use Finder OPTA with Arduino PLC IDE.
In first step I defined simple program in LD and read defined variables by my host (by Modbus TCP Client) . That is works.
Next step was defined modbus RTU device slave and try read data fro them .
And here is a problem.

opta
opta1307×544 155 KB

I noticed that when I run poll data by my host (Modbus TCP) then the Modbus RTU stop working.
Any idea what can be wrong?

2

I have more info.
After executing the program on my OPTA, the slaveNoResponseCount increments to 11 and the slave device status becomes MbError_SlaveLoss (see attached screenshot).

Setting active = TRUE , changing chn to 10, and then reverting chn to its original value restores communication.

part1
part1978×420 103 KB

part2
part2948×408 102 KB

3

This is my temporary to workaround:

// When errors detected

IF (sysMbMRtuNetList[0].slaveNoResponseCount >= 3 OR NOT sysMbMRtuNetList[0].active )

AND NOT recoveryTrigger AND NOT recoveryDone THEN

sysMbMRtuNetList[0].slaveNoResponseCount := 0;

recoveryTrigger := TRUE;

END_IF;

// Recovery sequence

IF recoveryTrigger THEN

handle := sysMbMRtu_GetSlaveHandle(0, 1);

errorRTU := sysMbMRtu_SlaveActivation(0, handle, FALSE); // Deactivate

recoveryTrigger := FALSE;

recoveryDone := TRUE; // Will reactivate on next cycle

ELSIF recoveryDone THEN

handle := sysMbMRtu_GetSlaveHandle(0, 1);

errorRTU := sysMbMRtu_SlaveActivation(0, handle, TRUE); // Reactivate

IF sysMbMRtuNetList[0].chn = 0 THEN

sysMbMRtuNetList[0].chn := 10;

ELSE

sysMbMRtuNetList[0].chn := 0;

END_IF;

recoveryDone := FALSE;

END_IF;