143
FX
3UC
Series Programmable Controllers
User’s Manual - Hardware Edition
5 Input Specifications and External wiring
5.2 24V DC Input Type
1
O
utline
2
Exter
nal
D
im
en
sions
3
Ge
ne
ric
Speci
ficat
ions
4
Pow
er Suppl
y
Specif
icati
ons
5
Input
Spec
ific
ations
6
O
utput
Specif
icat
ions
7
Exam
pl
es
of
W
iri
ng
fo
r
Va
rious U
ses
8
Te
rm
inal B
lock
9
CC
-L
in
k/L
T
Ma
ste
r F
X
3UC
(LT
only)
10
D
ispl
ay m
odule
FX
3UC
(L
T only)
2. In the case of input device with built-in parallel resistance
Use a device having a parallel resistance, Rp, of 15k
Ω
or more.
If the resistance is less than 15k
Ω
, connect a bleeder resistance, Rb, obtained by the following formula as
shown in the following figure.
• Examples of wiring (Dedicated to sink input types only)
• Examples of wiring (Common to both sink and source input types)
3. In the case of 2-wire proximity switch
Use a two-wire proximity switch whose leakage current, I , is 1.5mA or less when the switch is off.
When the current is 1.5mA or more, connect a bleeder resistance, Rb, determined by the following formula as
shown in the following figure.
• Examples of wiring (Dedicated to sink input types only)
• Examples of wiring (Common to both sink and source input types)
Rb
4Rp
15-Rp
(k
Ω
)
≤
PLC
X
Rp
+24V
Rb
COM
Bleeder
resistance
15k
Ω
or
more
PLC
X
Rp
Rb
COM
24V DC
Fuse
Sink input wiring
Bleeder
resistance
15k
Ω
or
more
PLC
X
Rp
Rb
COM
24V DC Fuse
Source input wiring
Bleeder
resistance
15k
Ω
or
more
Rb
6
I -1.5
(k
Ω
)
≤
PLC
X
COM
+24V
Rb
I
Bleeder
resistance
2-wire
proximity
sensor
PLC
X
I
Rb
24V DC Fuse
Source input wiring
COM
Bleeder
resistance
2-wire
proximity
sensor
PLC
X
I
Rb
24V DC
Fuse
Sink input wiring
COM
Bleeder
resistance
2-wire
proximity
sensor
Содержание FX3UC Series
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