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5
FUNCTIONS
5.2 Master Function
5.2.1 Automatic communication function
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This section explains the functions of the QJ71MT91 as a master of MODBUS/TCP.
The automatic communication function allows device read/write request messages to
be automatically issued from the QJ71MT91 to the MODBUS/TCP-compatible slave
devices.
POINT
30000 is used for the port number on the QJ71MT91 side.
(1) To use automatic communication function
Set the automatic communication parameters to use this function.
Refer to Section 7.3 for details of the automatic communication parameters.
(2) Start and stop of automatic communication function
(a)
When the automatic communication parameters are set from the utility
package (GX Configurator-MB), the automatic communication function is
activated by powering ON the programmable controller from OFF or by
resetting the programmable controller CPU (with the programmable
controller CPU's RUN/STOP switch set to RUN).
The automatic communication will not start if the programmable controller is
powered ON from OFF or if the programmable controller CPU is reset (with
the programmable controller CPU's RUN/STOP switch set to STOP).
If the QJ71MT91 is mounted on a MELSECNET/H remote I/O station, the
automatic communication function is activated when the remote I/O station
receives the information notifying the status change (from STOP to RUN) of
the remote master station's programmable controller CPU.
Setting the automatic communication parameters from GX Configurator-MB
eliminates the need of a sequence program for start.
MELSEC-Q
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