Mitsubishi Electric FX3U-232-BD - Two-Pair Wiring

D-37
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.A
Discontinued models
4.5.2 Two-pair wiring
*1. Make sure to perform Class-D grounding on the shield of a twisted pair cable connected to
the FX
2N-485-BD, FX1N-485-BD, FX3G-485-BD, FX3U-485-BD, FX2NC-485ADP or
FX
3U-485ADP(-MB).
*2. 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.
*3. 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, FX2NC-485ADP, FX2N-485-BD and FX1N-485-BD are supplied together with
terminal resistors.
Terminal
resistor:
330 
Class-D grounding
(resistance: 100  or less)
*1
Class-D grounding
(resistance: 100  or less)
*1
FX2NC-485ADP

SG
SG
FX
0N-485ADP
LINK
SG
FG
*2
Terminal
resistor:
330 
SDA
(TXD+)
SDB
(TXD-)
RDA
(RXD+)
RDB
(RXD-)
SDA
(TXD+)
SDB
(TXD-)
RDA
(RXD+)
RDB
(RXD-)
SDA
(TXD+)
SDB
(TXD-)
RDA
(RXD+)
RDB
(RXD-)
SDA
(TXD+)
SDB
(TXD-)
RDA
(RXD+)
RDB
(RXD-)
LINK
SG
*3 *3
*3 *3
FX 3U -485-BD
FX
3G-485-BD
FX
2N-485-BD
FX
1N-485-BD
FX
3U-485ADP(-MB)
Communication
equipment operating
in accordance with
RS-485/RS-422
× 2× 2
FG