Mitsubishi FX3U-232-BD - 4.5 Connection Diagram for RS-485 and RS-422; 4.5.1 One-pair wiring; 4.5.2 Two-pair wiring

D-30
FX Series PLC User's Manual - Data Communication Edition
Computer Link
4 Wiring
4.5 Connection Diagram for RS-485 and RS-422
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
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 FX 2N -485-BD, FX 1N -485-BD,
FX
3U -485-BD, FX 2NC -485-ADP or FX 3U -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 and FX 3U -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
Terminal
resistor:
330
Ω
×
2
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
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:
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
3U -485-BD, FX 2NC -485-ADP or FX 3U -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 and FX 3U -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