1 FUNCTIONS
1.7 Communications Using MODBUS/TCP
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1
MODBUS device assignment function
This function automatically converts the access to the MODBUS devices of the RJ71EN71 and RnENCPU (network part) into
the access to the devices of the CPU module.
Use the MODBUS device assignment parameters to create the association between the MODBUS devices and the device
memory areas of the CPU module.
This allows the RJ71EN71 and RnENCPU (network part) to convert the access to the MODBUS device specified in the
request message from the MODBUS/TCP master device into the access to the corresponding device of the CPU module.
Setting procedure
Set the assignment to the MODBUS devices in "MODBUS/TCP Settings" under "Application Settings".
For details, refer to the following.
Page 254 MODBUS/TCP Settings
(1) Request message (request for reading the value in holding register 400500)
(2) Response message (response with the value in holding register 400500 (1234H))
RJ71EN71
D300 D300
D299
D301
400500
400499
400501
(1)
(2)
1234H
CPU module
MODBUS/
TCP master device
Device memory
Device memory
MODBUS device assignment parameter
MODBUS device
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