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6
PRE-OPERATIONAL PROCEDURES AND SETTING
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(b) MODBUS device assignment parameter starting method (Bit 1)
Set the MODBUS device assignment parameters for the time when the
power is turned OFF and then ON.
[When corresponding bit is OFF]
The QJ71MT91 starts up with its default MODBUS device assignment
parameters.
[When corresponding bit is ON]
The QJ71MT91 starts up with the MODBUS device assignment parameters
set using a sequence program or GX Configurator-MB.
However, the user-set MODBUS device assignment parameters are not
registered to the QJ71MT91 until the following operation is performed.
When a sequence program was used to set the MODBUS device
assignment parameters
Turn ON "MODBUS device assignment parameter setting request (Y8)".
When GX Configurator-MB was used to set the MODBUS device
assignment parameters
After the intelligent function module parameters have been written to the
programmable controller CPU, the initial setting is updated when the
programmable controller is powered ON from OFF or the programmable
controller CPU is reset (with the programmable controller CPU's
RUN/STOP switch set to RUN).
POINT
(1) Make this setting ON when a sequence program or GX Configurator-MB is used
to set the MODBUS device assignment parameters.
(2) If no MODBUS device assignment parameters have been set with this setting
ON, the slave function does not operate.
Refer to Section 6.6.1 for details of the communication starting conditions of this
switch setting and each function.
(c) Online change enable/disable setting (Bit 2)
Set whether to enable or disable the slave (QJ71MT91) to write data to the
programmable controller CPU while the programmable controller CPU is in
RUN status.
[When corresponding bit is OFF]
Data write is disabled while the programmable controller CPU is in RUN
status.
When the slave (QJ71MT91) receives a write request message from the
master in this setting, the slave (QJ71MT91) issues the exception code
(04
).
H
[When corresponding bit is ON]
Data write is enabled while the programmable controller CPU is in RUN
status.
MELSEC-Q
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