FX
3U
Series Programmable Controllers
User’s Manual - Hardware Edition
241
12 Output Wiring Procedures
12.3 External Wiring of Transistor Output (Sink/Source) Type
11
Hi
gh
-Speed
Counters
12
O
utput W
iri
ng
13
W
iri
ng for
V
ari
ous
Us
es
14
Te
st R
un,
Mai
nten
ance,
T
roubl
es
hooti
ng
15
IInput/Output
Pow
ered
Exte
nsi
on U
nit
s
16
Input/O
utput
Extens
ion
Bl
ock
s
17
Extension
Power Suppl
y
Un
it
18
Other Extens
ion
Uni
ts an
d
Opti
ons
19
D
isplay M
od
ule
20
Te
rminal
Bl
oc
k
12.3.4 External wiring precautions
1. Protection circuit for load short-circuits
A short-circuit at a load connected to an output terminal could cause burnout at the output element or the
PCB. To prevent this, a protection fuse should be inserted at the output.
Use a load power supply capacity that is at least 2 times larger than the total rated fuse capacity.
• External Wiring of Sink Output Type
• External Wiring of Source Output Type
2. Interlock
For loads such as forward/reverse contactors, etc., where a hazardous condition could result if switched ON
simultaneously, an external interlock should be provided for interlocking the PLC’s internal programs, as
shown below.
• External Wiring of Sink Output Type
• External Wiring of Source Output Type
PLC
Y
COM1
Load
Fuse
PLC
Y
+V0
Load
Fuse
Limit of normal
rotation
Interlock
Limit of reverse
rotation
PLC output
element
Limit of normal
rotation
Interlock
Limit of reverse
rotation
PLC output
element
Summary of Contents for FX2-16E series
Page 2: ......
Page 8: ... 6 Safety Precautions Read these precautions before use MEMO ...
Page 519: ......