The system must support the collection of trend log objects. Logging of those objects must be achieved according to the following principles:
- Using COV (change of value): every time the value is changing, a record is logged into the database
- Using time intervals: the record is logged into the database, given a specific and user defined time parameter (time filter).
The following time parameters must be supported:
- Default (no time filter applied)
- 30 seconds
- 1 minute
- 5 minutes
- 10 minutes
- 15 minutes
- 30 minutes
- 60 minutes
- 24 hours
Specified products: Siemens / Desigo CC or similar