D-33
FX Series PLC User's Manual - Data Communication Edition
Computer Link
4 Wiring
4.3 Selecting Cables and Terminal Resistors (RS-485)
A
Comm
on I
te
ms
B
N:
N N
etwo
rk
C
Paral
le
l Li
nk
D
Com
puter Li
nk
E
In
verter
C
omm
uni
cation
F
N
on-Proto
col
C
ommunicati
on
(R
S/RS
2 Instru
ction
)
G
No
n-
Protoc
ol
Co
mmuni
ca
tion
(FX
2N
-2
32IF)
H
Programm
ing
Comm
uni
cation
I
Re
mo
te
Ma
intenance
Apx.A
D
isco
nti
nued
models
4.3.4
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.
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
, 1/2 W.
In the case of two-pair wiring, use four terminal resistors of 330
, 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
3U
-485-BD, FX
3G
-485-BD, FX
3G
-485-BD-RJ or
FX
3U
-485ADP(-MB)
The FX
3U
-485-BD, FX
3G
-485-BD, FX
3G
-485-BD-RJ and FX
3U
-485ADP(-MB)
have built-in terminal resistors.
Set the terminal resistor selector switch accordingly.
• FX
3U
-485-BD
• FX
3U
-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
3 3 1 =330
(10
1
)
Orange
Precision
Brown
Terminal
resistor selector
switch
330
OPEN
110
Terminal
resistor
selector
switch
(0.01")
(0.09")
0.4mm
2.5mm
Select a
straight tip.
with a
screwdriver
Terminal block mounting screws
Terminal resistor
selector switch
Terminal resistor
selector switch
Summary of Contents for FX-485ADP
Page 2: ......
Page 120: ...B 2 FX Series PLC User s Manual Data Communication Edition N N Network ...
Page 188: ...C 2 FX Series PLC User s Manual Data Communication Edition Parallel Link ...
Page 244: ...D 2 FX Series PLC User s Manual Data Communication Edition Computer Link ...
Page 344: ...E 2 FX Series PLC User s Manual Data Communication Edition Inverter Communication ...
Page 700: ...H 2 FX Series PLC User s Manual Data Communication Edition Programming Communication ...
Page 752: ...I 2 FX Series PLC User s Manual Data Communication Edition Remote Maintenance ...
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