Communication
FPΣ User's Manual
158
8.1.6 Modbus RTU Master/Slave
This communication mode uses the Modbus RTU protocol to exchange data between a
master and one or more slaves. This is called 1:1 or 1:N communication.
Modbus RTU connection between the FPΣ and an external device
1
Command message
2
Response message
There is a Modbus RTU master function and a Modbus RTU slave function. The side that
issues commands is called master. The slave receives the commands, executes the process
and sends back responses. The slave answers automatically to the commands received from
the master, so no program is necessary on the slave.
The Modbus protocol supports both ASCII mode and RTU binary mode. However, the PLCs
of the FP Series only support the RTU binary mode.
REFERENCE
For detailed information on the Modbus RTU communication mode, see
"
Modbus RTU Communication" on page 244.
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