Mitsubishi FX3U-422-BD - Connection Diagram for RS-485 and RS-422

D-35
FX Series PLC User's Manual - Data Communication Edition
Computer Link
4 Wiring
4.5 Connection Diagram for RS-485 and RS-422
A
Common Items
B
N:N Network
C
Parallel Link
D
Computer Link
E
Inverter Communication
F
Non-Protocol Communication (RS/RS2 Instruction)
G
Non-Protocol Communication (FX
2N
-232IF)
H
Programming Communication
I
Remote Maintenance
Apx.
Discontinued models
4.5 Connection Diagram for RS-485 and RS-422
4.5.1 One-pair wiring
4.5.2 Two-pair wiring
Terminal
resistor:
110 Ω
Class-D grounding
(resistance: 100 Ω or less)
*1
Class-D grounding
(resistance: 100 Ω or less)
*1
FX 2NC -485ADP
SDA
SDB
RDA
RDB

SG
FX
3G -485-BD
FX
3U -485-BD
FX
2N -485-BD
FX
1N -485-BD
FX
3U -485ADP(-MB)
SDA
SDB
RDA
RDB
SG
FX
0N -485ADP
SDA
SDB
RDA
RDB
LINK
SG
FG
*2
Terminal
resistor:
110 Ω
Communication
equipment operating
in accordance with
RS-485
SDA
SDB
RDA
RDB
LINK
SG
*3 *3
Make sure to perform Class-D grounding to the shield of a twisted pair cable connected to the FX2N-485-BD, FX1N-485-BD,
FX3G-485-BD, FX3U-485-BD, FX2NC-485-ADP or FX3U-485ADP(-MB).
Make sure to connect the terminal to the (grounding) terminal in the PLC requiring Class-D grounding.
If the grounding terminal is not provided in the PLC, perform Class-D grounding directly.
Make sure to provide a terminal resistor at the end of each line.
 The FX
3U -485-BD, FX 3G -485-BD and FX 3U -485ADP(-MB) have a built-in terminal resistor.
Set the terminal resistor selector switch accordingly.
 The FX
0N-485ADP, FX2NC-485ADP, FX2N-485-BD and FX1N-485-BD are supplied together with terminal resistors.
*1
*2
*3
FG
Terminal
resistor:
330 Ω
× 2
Class-D grounding
(resistance: 100 Ω or less)
*1
Class-D grounding
(resistance: 100 Ω or less)
*1
FX2NC-485ADP
SDA
SDB
RDA
RDB

SG
FX
3G-485-BD
FX
2N-485-BD
FX
1N-485-BD
FX
3U-485ADP(-MB)
SDA
SDB
RDA
RDB
SG
FX
0N-485ADP
SDA
SDB
RDA
RDB
LINK
SG
FG
*2
Terminal
resistor:
330 Ω
× 2
Communication
equipment operating
in accordance with
RS-485/RS-422
SDA
SDB
RDA
RDB
LINK
SG
*3 *3
*3 *3
Make sure to perform Class-D grounding to the shield of a twisted pair cable connected to the FX 2N -485-BD, FX 1N -485-BD,
FX
3G-485-BD, FX3U-485-BD, FX2NC-485-ADP or FX3U-485ADP(-MB).
Make sure to connect the terminal to the (grounding) terminal in the PLC requiring Class-D grounding.
If the grounding terminal is not provided in the PLC, perform Class-D grounding directly.
Make sure to provide a terminal resistor at the end of each line.
 The FX
3U-485-BD, FX3G-485-BD and FX3U-485ADP(-MB) have a built-in terminal resistor.
Set the terminal resistor selector switch accordingly.
 The FX
0N -485ADP, FX 2NC -485ADP, FX 2N -485-BD and FX 1N -485-BD are supplied together with terminal resistors.
*1
*2
*3
FG
FX 3U -485-BD