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482
Inspections
Section 10-1
10-1 Inspections
Daily or periodic inspections are required in order to maintain the PLC’s func-
tions in peak operating condition.
10-1-1 Inspection Points
Although the major components in CP-series PLCs have an extremely long
life time, they can deteriorate under improper environmental conditions. Peri-
odic inspections are thus required to ensure that the required conditions are
being kept.
Inspection is recommended at least once every six months to a year, but more
frequent inspections will be necessary in adverse environments.
Take immediate steps to correct the situation if any of the conditions in the fol-
lowing table are not met.
No.
Item
Inspection
Criteria
Action
1
Source Power
Supply
Check for voltage fluctuations
at the power supply terminals.
The voltage must be within
the allowable voltage fluctu-
ation range.
(See note.)
Use a voltage tester to check the
power supply at the terminals. Take
necessary steps to bring voltage
fluctuations within limits.
2
I/O Power Sup-
ply
Check for voltage fluctuations
at the I/O terminals.
Voltages must be within
specifications for each Unit.
Use a voltage tester to check the
power supply at the terminals. Take
necessary steps to bring voltage
fluctuations within limits.
3
Ambient environ-
ment
Check the ambient tempera-
ture (inside the control panel if
the PLC is in a control panel).
0 to 55
°
C
Use a thermometer to check the
temperature and ensure that the
ambient temperature remains
within the allowed range of 0 to
55
°
C.
Check the ambient humidity
(inside the control panel if the
PLC is in a control panel).
Relative humidity must be
10% to 90% with no con-
densation.
Use a hygrometer to check the
humidity and ensure that the ambi-
ent humidity remains within the
allowed range.
Check that the PLC is not in
direct sunlight.
Not in direct sunlight
Protect the PLC if necessary.
Check for accumulation of
dirt, dust, salt, metal filings,
etc.
No accumulation
Clean and protect the PLC if neces-
sary.
Check for water, oil, or chemi-
cal sprays hitting the PLC.
No spray on the PLC
Clean and protect the PLC if neces-
sary.
Check for corrosive or flam-
mable gases in the area of the
PLC.
No corrosive or flammable
gases
Check by smell or use a sensor.
Check the level of vibration or
shock.
Vibration and shock must
be within specifications.
Install cushioning or shock absorb-
ing equipment if necessary.
Check for noise sources near
the PLC.
No significant noise
sources
Either separate the PLC and noise
source or protect the PLC.
Summary of Contents for CP1H-CPU - 05-2006
Page 2: ...CP1H X40D CP1H XA40D CP1H Y20DT D CP1H CPU Unit Operation Manual Revised May 2006...
Page 3: ...iv...
Page 11: ...xii TABLE OF CONTENTS...
Page 15: ...xvi...
Page 19: ...xx...
Page 31: ...xxxii Conformance to EC Directives 6...
Page 71: ...40 Function Blocks Section 1 5...
Page 133: ...102 Computing the Cycle Time Section 2 7...
Page 169: ...138 CPM1A Expansion I O Unit Wiring Section 3 6...
Page 411: ...380 Clock Section 6 8...
Page 519: ...488 Replacing User serviceable Parts Section 10 2...
Page 527: ...496 Standard Models Appendix A...
Page 535: ...504 Dimensions Diagrams Appendix B...
Page 628: ...597 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Page 629: ...598 Connections to Serial Communications Option Boards Appendix F...
Page 659: ...628 PLC Setup Appendix G...
Page 665: ...634 Index work words 159 write protection 370...
Page 667: ...636 Revision History...