Check communication with Modbus Serial (RTU) Slave

[pawel_kowalski_]

Hi,

As I wrote in the topic now I need some advice on how to check communication with modbus slave device.
Configuration what I have is below in the picture:

I searched tabs like in Modbus TCP where were Healthbits but in Serial probably it doesn't exist.
I try to use FB like IODrvModbusSerial where variable xAllSlavesOk shows FALSE and another variable uiNumberOfCommunicatingSlaves shows 0.
Maybe I using that FB wrong and that is why the variables show FALSE and 0.

[LeTomas · Accepted solution]

Hi @pawel_kowalski_ 

The ModbusSerial Device has their own structure, you can use the "Slave Name".xError to show that the device is disconnected or has another problem:

Best regards,

LeTomas