User Manual

Trend data
Simultaneous, multiple trends
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9 Trend data
9.1 Simultaneous, multiple trends
Multiple trend views must be possible simultaneously to provide a comprehensive
plant overview. Standard plants from medium to higher complexity (as in this
project) require a simultaneous display of up to 10 trend curves on the current
page view to assess the plants. Multiple trend curves must thus be recorded at the
same time.
Specified products: Siemens / Desigo CC or similar
9.2 Freely assign trend data
For greatest possible flexibility, operators must be able to assign and thus record
max. 4 additional data points individually for each plant.
The assignment must be carried out from the management station.
Specified products: Siemens / Desigo CC or similar
9.3 Decentralized data storage
None of the trend data may be lost during communications failure to achieve gap-
free trend documentation. For this reason, all trend data must be created and
saved to the automation station. After communications are restored, all values
saved on the management station must be updated automatically.
Specified products: Siemens / Desigo CC or similar
9.4 Record history data, trend
Vital data points and setpoints must be saved for each building services plant. The
polling time is oriented to the signal type, i.e. analog values are recorded cyclically
while digital or multistate values are recorded by event.
Specified products: Siemens / Desigo CC or similar
9.5 Intermediate storage of history data
Trend data are collected in the automation station and transferred to the
management level after a specific time has expired or specific number of data has
been recorded. Trend data may not be lost if the management station is
unavailable temporarily.
Specified products: Siemens / Desigo CC or similar
9.6 Trend comparison
The system must offer a time adjusted trend view to run analysis of changed
conditions at various times.
Specified product: Siemens / Desigo CC or similar