Mitsubishi FX3U-232-BD User Manual page 230

FX Series PLC User's Manual - Data Communication Edition
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2. Terminal block
In the FX -485ADP and FX-485ADP, the terminal screw size is "M3".
0N
Make sure to use a crimp-style terminal with the following sizes.
Make sure that the tightening torque is 0.5 to 0.8 N·m.
• When wiring one cable to one terminal
6.2 mm (0.24")
or less
6.2 mm (0.24")
or less
• When wiring two cables to one terminal
6.2 mm (0.24")
or less
6.2 mm (0.24")
or less
4.3.3 Connecting terminal resistors
Make sure to provide a terminal resistor at the end of each line.
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
D-28
φ 3.2 (0.13")
6.3 mm (0.25")
or more
φ 3.2 (0.13")
Terminal
6.3 mm (0.25")
or more
φ 3.2 (0.13")
6.3 mm (0.25")
or more
φ 3.2 (0.13")
Terminal
6.3 mm (0.25")
or more
-485-BD or FX -485ADP(-MB)
3U 3U
-485ADP(-MB) have built-in terminal resistors.
3U
Terminal
resistor selector
330 Ω
switch
OPEN
110 Ω
4.3 Selecting Cables and Terminal Resistors (RS-485)
Crimp-style
Terminal
terminal
screw
Terminal Crimp-style
screw terminal
Brown Precision
=110 Ω
1 1 1
(10 1 )
Orange Brown Precision
=330 Ω
3 3 1
1
(10 )
330 Ω
Terminal
OPEN resistor selector
switch
110 Ω
4 Wiring