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5
FUNCTIONS
5.3.2 MODBUS device assignment function
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(1) MODBUS device assignment function
(a)
The MODBUS device assignment function automatically converts access to
a slave (QJ71MT91) MODBUS device into access to a programmable
controller CPU device.
(b)
Using MODBUS device assignment parameters, the MODBUS devices are
correlated with the programmable controller CPU device memory.
This allows direct access from the MODBUS/TCP-compatible master
device to the programmable controller CPU device memory.
(c)
Since the QJ71MT91 supports large capacities of MODBUS devices, all the
device memory areas of the programmable controller CPU can be
assigned.
Refer to Section 7.4.1 for the MODBUS device sizes.
(2) MODBUS device assignment parameter setting
(a)
Set the MODBUS device assignment parameters from the utility package
(GX Configurator-MB).
(Setting from a sequence program is also available. (Refer to Section
9.1.3.))
Refer to Section 7.4 for details of the MODBUS device assignment
parameters.
(b)
As the MODBUS device assignment parameters, the default assignment
parameters are available.
Refer to Section 7.4.3 for the default assignment parameters.
MELSEC-Q
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