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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 supply
CPU
Peripheral device
Communication
Memory
Others
No answer
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
Unknown cause
Noise
Short of load
Poor connection
Manufacturer's fault
Others
Incorrect programming
Vibration shock
Collected from 223 factories
50
(%)
1.3
No answer