Modbus(R) Device Assignment Parameters - Mitsubishi QJ71MB91 User Manual

9
PROGRAMMING

9.2.2 MODBUS(R) 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
(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
D12287
Setting target
QJ71MB91
(Slave function)
(Station No.1)
* 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
QJ71MB91 buffer memory
User free area
5000
H
5500
H
1024 points
58FF
H
5FFF
H
Figure 9.15 MODBUS
9.2 Program Example for Normal System Configuration
*1
MODBUS master device
CH2
RS-422/485
device assignment parameter setting
MODBUS device
Coil
512 points
Input register
5500 points
Holding register
1024 points
device assignment diagram
9.2.2 MODBUS(R) device assignment parameters
R
R
000001
000512
065536
300001
303500
308999
365536
400001
401024
465536
9
9
10
11
".
H
- 14