Connection Diagram For Modbus Rs-485; One-Pair Wiring; Two-Pair Wiring - Mitsubishi FX3U Series User Manual

FX Series Programmable Controllers
3U
User's Manual - MODBUS Serial Communication Edition
4.5

Connection Diagram for MODBUS RS-485

4.5.1

One-pair wiring

FX -485ADP-MB
3U
Master
SDA
Terminal
SDB
resistor:
110 Ω
RDA
*2
RDB
LINK
SG
Class-D grounding
(resistance: 100 Ω or less)
*1 Make sure to perform Class-D grounding on the shield of the twisted pair cable connected to the FX
*2 Make sure to provide a terminal resistor at each end of a line.
The FX -485ADP-MB has a built-in terminal resistor.
3U
Set the terminal resistor selector switch accordingly.
4.5.2

Two-pair wiring

FX -485ADP-MB
3U
Master
SDA
SDB
*2
RDA
RDB
*2
Terminal
resistor:
LINK
330 Ω
× 2 SG
Class-D grounding
(resistance: 100 Ω or less)
*1 Make sure to perform Class-D grounding on the shield of the twisted pair cable connected to the FX
*2 Make sure to provide a terminal resistor at each end of a line.
The FX -485ADP-MB has a built-in terminal resistor.
3U
Set the terminal resistor selector switch accordingly.
FX -485ADP-MB
3U
Slave
SDA
SDB
RDA
RDB
SG
Class-D grounding
(resistance: 100 Ω or less)
*1
FX -485ADP-MB
3U
Slave
SDA
SDB
RDA
RDB
SG
Class-D grounding
(resistance: 100 Ω or less)
*1
4.5 Connection Diagram for MODBUS RS-485
FX -485ADP-MB
3U
Slave
SDA
SDB
RDA
RDB
SG
Class-D grounding
(resistance: 100 Ω or less)
*1
-485ADP-MB.
3U
FX -485ADP-MB
3U
Slave
SDA
SDB
RDA
RDB
SG
Class-D grounding
(resistance: 100 Ω or less)
*1
-485ADP-MB.
3U
4 Wiring
1
2
FX -485ADP-MB
3U
Slave
SDA
3
Terminal
SDB
resistor:
110 Ω
RDA
*2
RDB
4
SG
*1
5
6
FX -485ADP-MB
3U
Slave
SDA
7
SDB
*2
RDA
8
RDB
*2
Terminal
resistor:
330 Ω
SG
× 2
9
*1
10
25