I have a beginner qestion.
According to Modbus terminology protocol there’s need to be one master and multiple slaves. (or one slave)
Let’s assume I have 10 place’s where I have 1 PLC and 4 I/O’s devices attached to it for each place, and my PLC’s communicate with a SCADA server over TCP/IP network.
The Master for the PLC’s is the SCADA server and the master for the I/O devices is are the PLC’s?
Another question is how many devices cand Ignition support over Modbus protocol?
The theory that Modbus protocol can have a maximum of 247 devices is available only on devices connected to the PLC’s?
Thank you in advance guys!