Product specifications

Performance
3BDS011222-510 B 323
wrapping), it is useful to the PC to determine whether a data package is about
to be duplicated or it has been lost.
As there is no Acknowledge associated with this protocol, the SDL Collector buffers
the data prepared by PLC before storing it in the SDL database. This will reduce the
possibility of data loss due to slow database response.
Performance
Performance of SDL function is influenced by many parameters such as 800xA
Server Configuration (number of CPUs), CPU clock speed, amount of primary
memory (RAM), speed of RAM, speed of disks, network throughput, database
performance, connectivity server performance, PLC performance, and load from
other functions running simultaneously and so on.
This makes it difficult to quantify the performance of SDL function. However, the
following considerations are useful when configuring function and using the SDL
Information aggregated in SQL Server databases.
Data Collection
Data collection through SDL feature and storage of collected data in SQL Server
SDL database, will not reduce performance as long as no other process is ongoing in
the database.
Consider the following scenario:
A specific production facility is expected to produce 180 Transport Logs and 60
Unit Logs an hour.
The protocol cycle, that is, the handling time for each log from the data source to the
database, for this particular production facility is estimated to 10 seconds.
The number of required concurrently running SDL Log channels to accommodate
this data rate can then be calculated as follows:
No. of Transport Log channels = 180 / (3600/10) = 0.5 < 1
No. of Unit Log channels = 60 / (3600/10) = 0.167 < 1
Above described scenario is a realistic situation for many production facilities. The
load of keeping this data rate must be modest.