The amount of data required to complete a task is different for each level of personnel in your plant. The control system engineer might require having full read and writing access to all points in the automation system while an operator might only require access to a few points in the system in order to view the status of a machine and control it. This might be the same case for those at the management level - personnel at that level might only require read access to key performance data items.
Solution – OPC Security
Providing Data Access on a Need-To-Know Basis
Oct 11th, 2010