Qj71Mb91 Buffer Memory Assignment - Mitsubishi Electric QJ71MB91 User Manual

7
PARAMETER SETTING

7.3.3 QJ71MB91 buffer memory assignment

The QJ71MB91 can assign the MODBUS devices to the QJ71MB91 buffer memory.
By this assignment of the QJ71MB91 buffer memory to the MODBUS device, access to
the MODBUS devices will not be affected by sequence scans.
This allows the QJ71MB91 to respond faster to the master.
(1) To assign the QJ71MB91 buffer memory to the MODBUS device
(a) When using the MODBUS device assignment parameter
(b) When using the default assignment parameter
(2) Assignment range of MODBUS devices
The following QJ71MB91 buffer memory addresses can be assigned to the MODBUS
devices.
When setting the MODBUS device assignment parameter, set F000
device code.( Section 7.3.1 (2))
Use any of the MODBUS device, 422529 to 426624.
( Section 7.3.1 (3))
Buffer memory
Address
5000 to 5FFF
H H
(20480 to 24575)
7.3 MODBUS Device Assignment Parameter
Table7.9 Usable buffer memory
Size Name
4096 User free area
7.3.3 QJ71MB91 buffer memory assignment
1
2
for the
H
3
4
Automatic refresh
Setting allowed
5
6
7
8
7
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