Download MODBUS(R) Interface Module User`s Manual

PROGRAMMING
9
PROGRAMMING
9.3.2 MODBUS(R) device assignment parameter
(1) System configuration
The following system configuration is used for the program example in which
MODBUS device assignment parameters are set to the QJ71MB91 on a
MELSECNET/H remote I/O station.
10
DEDICATED
INSTRUCTIONS
MELSECNET/H remote master station *1
GX Developer
11
TROUBLESHOOTING
MELSECNET/H (remote I/O network)
Setting target
MELSECNET/H
remote I/O station
(Station No.1)
QJ71MB91
RUN
NEU.
SD
CH1
RD
MODBUS master device
ERR.
NEU.
SD C H2
RD
CH1
RS- 232
SDA
1
SG
RDA
2
3
4
5
( FG)
RDB
CH2
RS- 422
/ 485
6
7
APPENDICES
SDB
( FG)
CH2
QJ71MB91 (Slave function)
(Station No.1)*2
Figure 9.40 System configuration example for the MODBUS
RS-422/485
device assignment parameter setting
* 1 The MELSECNET/H remote master station is installed in slot 0 of the base unit with the Start I/O
No. set as "00H".
* 2 The QJ71MB91 is to be mounted in slot 0 of the base unit with the head I/O number set to “00H”.
INDEX
9
Remark
For details on construction and parameter setting of the MELSECNET/H remote I/
O network, refer to the following manual.
Q Corresponding MELSECNET/H Network System Reference Manual
(Remote I/O network)
9.3 Program Example for Use in MELSECNET/H Remote I/O Network
9.3.2 MODBUS(R) device assignment parameter
9 - 37