C-26
FX Series PLC User's Manual - Data Communication Edition
Parallel Link
4 Wiring
4.3 Connection Diagram
4.3 Connection Diagram
4.3.1 For FX3U and FX3UC PLCs
1. In the case of one-pair wiring
2. In the case of two-pair wiring
*1 Make sure to perform Class-D grounding to the shield of a twisted pair cable connected to the FX
3U
-485-BD or
FX
3U
-485ADP(-MB).
*2 The FX
3U
-485-BD and FX
3U
-485ADP(-MB) have a built-in terminal resistor.
Set the terminal resistor selector switch to 110
Ω
.
Class-D grounding (resistance: 100
Ω
or less)
*1
FX
3U
-485-BD
FX
3U
-485ADP(-MB)
SDA
SDB
RDA
RDB
SG
Termina
l resistor
110
Ω
Terminal
resistor
110
Ω
FX
3U
-485-BD
FX
3U
-485ADP(-MB)
SDA
SDB
RDA
RDB
SG
*2
*2
FX
3U
-485-BD
FX
3U
-485ADP(-MB)
SDA
SDB
RDA
RDB
SG
Termina
l resistor
330
Ω
×
2
Class-D grounding (resistance: 100
Ω
or less)
*1
FX
3U
-485-BD
FX
3U
-485ADP(-MB)
SDA
SDB
RDA
RDB
SG
Terminal
resistor
330
Ω
×
2
*2
*2
*2
*2
*1 Make sure to perform Class-D grounding to the shield of a twisted pair cable connected to the FX
3U
-485-BD or
FX
3U
-485ADP(-MB).
*2 The FX
3U
-485-BD and FX
3U
-485ADP(-MB) have a built-in terminal resistor.
Set the terminal resistor selector switch to 330
Ω
.
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