Mitsubishi FX3U-232-BD User Manual page 175

FX Series PLC User's Manual - Data Communication Edition
Parallel Link
4.2.4 Connecting terminal resistors
In the case of one-pair wiring, connect a terminal resistor to the RDA-RDB signal
terminal of the communication equipment.
In the case of two-pair wiring, connect a terminal resistor to the RDA-RDB signal
terminal and SDA-SDB terminal of the communication equipment.
1. Terminal resistor type
In the case of one-pair wiring, use two terminal resistors of 110 Ω, 1/2 W.
In the case of two-pair wiring, use four terminal resistors of 330 Ω, 1/4 W.
Among the terminal resistors supplied with the communication equipment, select
ones with the color codes shown to the right.
2. When using the FX
The FX -485-BD and FX
3U
Set the terminal resistor selector switch accordingly.
330 Ω
OPEN
110 Ω
-485-BD or FX -485ADP(-MB)
3U 3U
-485ADP have built-in terminal resistors.
3U
Terminal
resistor selector
330 Ω
switch
OPEN
110 Ω
4.2 Selecting Cables and Terminal Resistors
Brown
1 1 1
(10 1 )
Orange Brown
3 3 1
(10 1
330 Ω
Terminal
OPEN resistor selector
switch
110 Ω
4 Wiring
A
Precision
B
=110 Ω
Precision
C
=330 Ω
)
D
E
F
G
H
I
Apx.
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