Siemens SIMATIC PCS 7 Function Manual page 4

Process control system
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6
OpenPCS 7 interface..................................................................................................................................45
6.1
Access options............................................................................................................................45
6.2
Data transmission........................................................................................................................45
6.3
OPC Data Access (OPC DA)......................................................................................................46
6.3.1
Overview......................................................................................................................................46
6.3.2
Introduction to the OPC Data Access interface...........................................................................46
6.3.3
How the OPC DA server works...................................................................................................47
6.4
OPC Historical Data Access (OPC HDA)....................................................................................48
6.4.1
Overview......................................................................................................................................48
6.4.2
How the OPC HDA server works.................................................................................................48
6.4.3
Data structure of the OPC HDA server........................................................................................49
6.4.4
Overview of supported attributes.................................................................................................50
6.4.5
Overview of supported aggregate functions................................................................................50
6.4.6
Overview of supported functions.................................................................................................51
6.4.7
Time format of the OPC HDA server...........................................................................................52
6.4.8
Quality codes of the OPC HDA server........................................................................................54
6.4.9
Write access supported by the OPC HDA server........................................................................54
6.5
6.5.1
Overview......................................................................................................................................55
6.5.2
6.5.3
6.5.4
6.5.5
6.5.6
Attributes of the PCS 7 OS message system..............................................................................60
6.5.7
Acknowledgment concept............................................................................................................61
6.5.8
6.5.9
OPC A&E with hierarchical access..............................................................................................64
6.5.9.1
6.5.9.2
Example 1: Messages are not assigned to any area...................................................................66
6.5.9.3
Example 2: Messages are assigned to an area..........................................................................69
6.5.9.4
6.5.10
6.5.10.2 How to update an OPC project with PCS 7 V8.0.........................................................................73
6.6
6.6.1
Overview......................................................................................................................................74
6.6.2
6.6.3
Reading archived messages.......................................................................................................75
6.6.4
Syntax for access to archived messages....................................................................................76
6.6.5
Read modes for archived messages...........................................................................................78
6.6.6
Identifying archived messages....................................................................................................79
6.7
OLE DB.......................................................................................................................................80
6.7.1
Overview......................................................................................................................................80
6.7.2
Basics of OLE DB........................................................................................................................81
6.7.3
Establishing the connection to the database...............................................................................82
6.7.4
Access to the OLE DB provider...................................................................................................83
6.7.5
Querying archive data.................................................................................................................85
6.7.5.1
Representation of the process value archive..............................................................................85
4
Function Manual, 05/2012, A5E02780178-02
OpenPCS 7

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