F-35
FX Series PLC User's Manual - Data Communication Edition
Non-Protocol Communication (RS/RS2 Instruction)
4 Wiring
4.3 Connection Diagram
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
4.3.3 Wiring for communication in accordance with RS-485
One-pair wiring and two-pair wiring (for RS-422) are applicable for communication in accordance with RS-
485. Perform proper wiring according to the external equipment.
1. One-pair wiring
*1. Make sure to perform Class-D grounding on the shield of a twisted pair cable connected to the FX2N-
485-BD, FX
1N-485-BD, FX3G-485-BD, FX3U-485-BD, FX2NC-485ADP or FX3U-485ADP(-MB).
*2. Make sure to connect the terminal to the (grounding) terminal in the PLC requiring Class-
D grounding.
*3. If the grounding terminal is not provided in the PLC, perform Class-D grounding directly.
*4. Make sure to provide a terminal resistor at the end of each line.
• The FX
3U-485-BD and FX3U-485ADP(-MB) have a built-in terminal resistor.
Set the terminal resistor selector switch accordingly.
• The FX
3G-485-BD, FX0N-485ADP, FX2NC-485ADP, FX2N-485-BD and FX1N-485-BD are supplied
together with terminal resistors.
When using the FX
2N-485-BD, signal loop between the PLC and the external device occurs since the FX2N-
485-BD has a full-duplex interface.
FX2NC-485ADP
SG
FX
3U
-485-BD,FX3G-485-BD,FX
2N
-485-BD
FX
1N
-485-BD,FX
3U
-485ADP(-MB)
SG
FX
0N-485ADP
LINK
SG
FG
*2
Communication
equipment operating
in accordance with RS-485
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
Class-D grounding
(resistance: 100 or less)
*1
Class-D grounding
(resistance: 100 or less)
*1
Terminal
resistor:
110
Terminal
resistor:
110
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