Communication
FPΣ User's Manual
244
8.8 Modbus RTU Communication
The Modbus RTU protocol enables the communication between the FPΣ and other devices
(including the Panasonic FP-e PLCs, touch terminals of the GT series and KT temperature
controllers). The master station sends instructions (command messages) to the slave stations
and the slave stations respond (send response messages) based on the instructions received.
The master station has read and write access to a maximum number of 99 slave stations.
Modbus RTU connection between the FPΣ and an external device
1
Command message
2
Response message
NOTE
The Modbus protocol supports both ASCII mode and RTU binary mode.
However, the PLCs of the FP Series only support the RTU binary mode.
Modbus RTU master function
Write and read access to various slaves is possible using the F145_WRITE and F146_READ
instructions. Individual access to each slave as well as global transmission is possible.
FP-e
FP-e
FP-X
KT KT
FP Σ
1
Master
2
Slave
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