Design and functions
Access to messages and historical data via OPC / WinCC OLE-DB
The WinCC/Connectivity Pack includes the OPC HDA 1.1 (Historical Data Access) and OPC A&E 1.0 (Alarm & Events) servers for accessing historical data of the WinCC archive system or for transferring/acknowledging messages. As an OPC XML DA 1.0 server, WinCC can even send data on a cross-platform basis across the Web to PPS/MES systems; in the opposite direction, it can take OPC XML DA client order or recipe data. As an HDA server WinCC makes available historical data from the WinCC archive system to other applications. The OPC client (e.g. a reporting tool) can specify the start and end times of a time interval and thus selectively request the data to be transferred. Apart from this, the client can request already conditioned data from the HDA server, i.e. actively trigger data compression before the data is transferred. The OPC HDA server can also be used in redundant configurations.
In OPC A&E, the system displays a WinCC message as an alarm and, together with all the ancillary process values, passes it on to any subscribers on the production or company management levels. Due to the filter mechanisms and subscriptions, the system only transfers selected, changed data. It is, of course, also possible to carry out acknowledgement at the MES or ERP level.
The WinCC OLE-DB Provider makes it possible to directly access the archive data that WinCC stored in the Microsoft SQL Server database (alarms, process values, user data). In this connection, you can even use statistic functions. From a WinCC multi-client, a transparent process data access via the OLE DB is now also possible to redundant WinCC systems and distributed configurations with central archive server. For the addressing, only the symbolic computer name is needed.
If process visualization is not needed at a station, you can use this WinCC option package to configure any Windows computer you like as a connectivity station with access to WinCC via OPC and WinCC OLE-DB without needing a WinCC installation to do so.