Siemens SIMATIC PCS 7 사용자 설명서
Introduction
2
Introduction
Increase in productivity through intelligent maintenance
How can the productivity of a plant with a high level of au-
tomation be increased even further?
Plant operators in all sectors consider increased availabili-
ty and shorter downtimes to be the most effective lever to-
ward increasing productivity. Investigations have shown
that downtimes are frequently the result of insufficient
maintenance – despite the fact that maintenance is alrea-
dy a significant portion of the lifecycle costs.
tomation be increased even further?
Plant operators in all sectors consider increased availabili-
ty and shorter downtimes to be the most effective lever to-
ward increasing productivity. Investigations have shown
that downtimes are frequently the result of insufficient
maintenance – despite the fact that maintenance is alrea-
dy a significant portion of the lifecycle costs.
Intelligent maintenance strategies can make a significant con-
tribution toward increasing productivity:
tribution toward increasing productivity:
• Failures can be prevented by monitoring the current plant
condition.
• Maintenance can then be planned. It does not wait until a
fault has occurred, but implements appropriate measures
in advance for avoiding faults. The timing of maintenance
can be planned such that the existing resources can be
used optimally.
in advance for avoiding faults. The timing of maintenance
can be planned such that the existing resources can be
used optimally.
• Innovative maintenance strategies pay for themselves
twice: planning security and the specific application of me-
thods reduces the direct maintenance costs.
thods reduces the direct maintenance costs.
• Plant availability is increased at the same time. This means
that consequential costs resulting from failures, such as
quality deficiencies or loss of image, are reduced.
quality deficiencies or loss of image, are reduced.
Totally Integrated Automation supports intelligent mainte-
nance strategies. The SIMATIC Maintenance Station is of signi-
ficant importance, and presents the information relevant to
maintenance from all automation components in a uniform
and clear manner, thus providing the maintenance engineer
with valuable support for making decisions.
nance strategies. The SIMATIC Maintenance Station is of signi-
ficant importance, and presents the information relevant to
maintenance from all automation components in a uniform
and clear manner, thus providing the maintenance engineer
with valuable support for making decisions.
Maintenance strategies
There are two maintenance strategies: response to failures or
taking preventive measures. In the case of failure-oriented
corrective maintenance, measures are only initiated when a
fault has occurred, i.e. failures are acceptable in this case and
may be minimized by a redundant plant design.
taking preventive measures. In the case of failure-oriented
corrective maintenance, measures are only initiated when a
fault has occurred, i.e. failures are acceptable in this case and
may be minimized by a redundant plant design.
The objective of preventive strategies is to carry out mainte-
nance measures before faults even occur, in order to avoid
possible downtimes. This strategy can be satisfied using
time-dependent and load-dependent measures. Regular
maintenance work is an example of time-dependent measu-
res. The load state is determined from the number of swit-
ching operations, operating hours or load peaks.
nance measures before faults even occur, in order to avoid
possible downtimes. This strategy can be satisfied using
time-dependent and load-dependent measures. Regular
maintenance work is an example of time-dependent measu-
res. The load state is determined from the number of swit-
ching operations, operating hours or load peaks.
Condition Monitoring, that is to say status monitoring, aims
to detect imminent faults at an early stage. It provides infor-
mation on the remaining duration of use. In the case of con-
dition-based maintenance, the maintenance measures are
only initiated when the period of use has expired.
to detect imminent faults at an early stage. It provides infor-
mation on the remaining duration of use. In the case of con-
dition-based maintenance, the maintenance measures are
only initiated when the period of use has expired.
It has been shown in practice that optimum results can be
achieved through intelligent combination of the different stra-
tegies.
achieved through intelligent combination of the different stra-
tegies.
Maintenance strategies
Benefits of intelligent maintenance
Continuous plant monitoring
■
Reduces the risk of failures, and increases the
availability
availability
■
Enables maintenance to be planned
Optimized use of maintenance resources
■
Increases maintenance quality
■
Achieves cost savings
The potential for savings arises
■
During maintenance itself and
■
by avoiding consequential costs
Corrective
Preventive
Maintenance
Time-dependent
Load-dependent
Condition-based
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Maintenance_PA_04_2010_en.book Seite 2 Dienstag, 6. September 2011 9:45 09
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