Mitsubishi Electric FX3U-232-BD - Connecting Terminal Resistors

B-22
FX Series PLC User's Manual - Data Communication Edition
N:N Network
4 Wiring
4.2 Selecting Cables and Terminal Resistors
4.2.4 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.
1. Terminal resistor type
Use two terminal resistors of 110 , 1/2 W.
Among the terminal resistors supplied with the communication equipment, select
ones with the color codes shown to the right.
2. When using the FX3U-485-BD, FX3G-485-BD, FX3G-485-BD-RJ or FX3U-485ADP(-MB)
The FX3U-485-BD, FX3G-485-BD, FX3G-485-BD-RJ and FX3U-485ADP(-MB) have built-in terminal resistors.
Set the terminal resistor selector switch accordingly.
•FX
3U-485-BD • FX3U-485ADP(-MB)
•FX
3G-485-BD
Remove the upper terminal block before changing over the switch in the FX
3G-485-BD.
Removal: Loosen the terminal block mounting screws, and remove the terminal block.
Installation: Attach the terminal block, and tighten the terminal block mounting screws.
Tightening torque: 0.4 to 0.5 N•m
Do not tighten terminal screws with a torque outside the above-mentioned range. Failure to do
so may cause equipment failures or malfunctions.
For installation and removal of the terminal block, use the
recommended tool shown below or a tool having straight tip (such as
screwdriver) as shown in the right figure.
<Reference>
•FX
3G-485-BD-RJ
Manufacturer Model name
Phoenix Contact Co., Ltd. SZS 0.4  2.5
1 1 1 =110 
Brown
(10
1
)
Precision
Terminal
resistor
selector
switch
Terminal
resistor selector
switch
330 
OPEN
110 
2.5mm
(0.09")
0.4mm
(0.01")
Select a
screwdriver
with a
straight tip.
Terminal block mounting screws
Terminal resistor
selector switch
Terminal resistor
selector switch