Limitations and recommended setting
The maximum amount of slaves for the Modbus driver is 32 however keep in mind that
If a slave disconnects and the desired function is that the Modbus RTU master should connect to
it automatic once available the “Auto-restart Communication” option should be enabled.
The response timeout should also be considered, by nature Modbus RTU will perform a
sequential polling of all the slaves configured in the project. If communication fails for a slave the
polling will be delayed according to the Response timeout setting which will delay the normal
system response time accordingly.
Error checking
To check the communication status of a specific slave use the name of the slave as in the project
tree and the option .xError. In addition the .byModbusError will show more in detail the cause
of error.
BFI_RTU_1.xError
BFI_RTU_1.byModbusError