Mitsubishi QJ71LP21 Reference Manual page 20

1 OVERVIEW
QCPU Master module
Link register W Link register LW
Refresh
QCPU Network module
Z.REMTO
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(3) Providing versatile communication service
(a) Reading and writing of data for an intelligent function module that has been
mounted to a remote I/O station can be easily performed.
There are four methods available for reading and writing.
1) Use GX Configurator to make the initial settings and automatic refresh
settings in the intelligent function module parameters, and write them
into the remote I/O module in the remote I/O station.
By refreshing the intelligent function module data to the link register W
of the remote I/O module in the auto refresh settings, the remote
master station can read/write refreshed data by cyclic transmission.
Remote master station
QCPU
Intelligent function
module parameters
• Initial settings
• Automatic refresh
settings
2) Special link instructions can be used to directly read from or write to the
buffer memory of the intelligent module.
• REMFR instruction: Reads data from the buffer memory of the
remote I/O station intelligent function module.
• REMTO instruction: Writes data to the buffer memory of the remote
I/O station intelligent function module.
Remote master station
QCPU
Remote I/O station
Intelligent function module
LW
GX
Configurator
REMTO
Remote I/O station
Intelligent function module
MELSEC-Q
Intelligent
Remote I/O module function module
Link register W Buffer memory
Refresh
Intelligent
Network module function module
Buffer memory
REMTO
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