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7
PARAMETER SETTING
7.4.5 QJ71MT91 buffer memory assignment
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(1) QJ71MT91 buffer memory assignment
The QJ71MT91 can assign the MODBUS devices to the QJ71MT91 buffer
memory.
By making this assignment, access to the MODBUS devices will not be
influenced by the sequence scan.
This enables the QJ71MT91 to respond faster to the master.
(2) To assign the QJ71MT91 buffer memory to the MODBUS device
(a) When using the MODBUS device assignment parameter
When setting the MODBUS device assignment parameter, set F000
the device code. (Refer to Section 7.4.2)
(b) When using the default assignment parameter
Use any of the MODBUS device, 422529 to 426624. (Refer to Section
7.4.3)
(3) MODBUS device assignment range
The following QJ71MT91 buffer memory addresses can be assigned to the
MODBUS devices.
Buffer Memory Address
5000
to 5FFF
H
H
Size
Name
4096
User free area
MELSEC-Q
for
H
Auto Refresh Setting
Available
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