Modbus Device Assignment Parameters - Mitsubishi Electric QJ71MB91 User Manual

9
PROGRAMMING

9.2.2 MODBUS device assignment parameters

(1) System configuration
The following system configuration is used to explain a program example for setting
the MODBUS device assignment parameters to the QJ71MB91.
GX Developer
Figure 9.14 System configuration example for the MODBUS device assignment parameter setting
(2) Communications
In the program example shown in this section, the following MODBUS device
assignment parameters are set for the setting target , QJ71MB91.
(a) MODBUS device assignment parameter assignment diagram
Setting target
QJ71MB91 *1
(Slave function) (Station No.1)
CH2
* 1 The QJ71MB91 is to be mounted in slot 0 of the base unit with the head I/O number set to "00
Programmable controller
CPU device memory
Output (Y)
Y0
Y100
512 points
Y2FF
Y1FFF
Data register (D)
D0
D3500
5500 points
D8999
D12287
QJ71MB91 buffer memory
User free area
5000H
5500H
1024 points
58FFH
5FFFH
Figure 9.15 MODBUS device assignment diagram
MODBUS master device
RS-422/485
MODBUS device
512 points
Input register
5500 points
Holding register
1024 points
9.2 Program Example for Normal System Configuration
9.2.2 MODBUS device assignment parameters
Coil
000001
000512
065536
300001
303500
308999
365536
400001
401024
465536
9
9
10
11
".
H
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