Mitsubishi Electronics 13JW55 사용자 설명서
9 - 1
CHAPTER 9 MAINTENANCE
9.1 Typical Trouble
The following bar graph shows the ratio of faulty parts and causes of programmable
controller errors.
[Source: Inspection made by JEMA (The Japan Electrical Manufacture's
Association)]
Figure 9.1 Faulty parts on programmable controllers (multiple answers allowed)
73.1
34.1
20.6
19.3
14.3
9.4
2.7
0.9
0
20
40
60
80
(%)
I/O
Power s
u
pp
ly
CPU
Per
ip
h
er
al d
e
vice
Co
m
m
unicatio
n
Memory
Oth
e
rs
No
an
swer
Collected from 223 factories
Figure 9.2 Causes of programmable controller faults (multiple answers allowed)
40.4
26.0
24.7
24.2
19.3
12.6
12.1
6.3
0
10
20
30
40
Un
know
n cau
s
e
No
ise
S
h
or
t of
lo
a
d
Poo
r con
n
ection
M
a
nu
fa
cturer's fault
Othe
rs
In
corre
ct p
rog
ramming
V
ibr
a
tio
n s
h
o
c
k
Collected from 223 factories
50
(%)
1.3
No a
n
swer