Quality Codes Of The Opc Hda Server; Write Access Supported By The Opc Hda Server - Siemens SIMATIC PCS 7 Function Manual

OpenPCS 7 interface
6.4 OPC Historical Data Access (OPC HDA)
6.4.8

Quality codes of the OPC HDA server

Quality codes
The quality code is required to check the status and quality of the raw data. The following table
shows the quality codes of OPC HDA.
Code
0x00040000
0x00080000
0x00100000
0x00200000
0x00400000
Additional information is available in the "OPC Historical Data Access Specification 1.20" of
the OPC Foundation.
6.4.9

Write access supported by the OPC HDA server

Introduction
The OPC HDA specification of the OPC Foundation also defines write access to archived data.
Note
PCS 7 is a process control system. In a process control system, archived data must not be
modified. For this reason, write access to archived data using OPC HDA has not been
enabled.
54
OPC
OPCHDA_RAW
OPCHDA_CALCULATED
OPCHDA_NOBOUND
OPCHDA_NODATA
OPCHDA_DATALOST
Description
Provides information on the quality of
the value transfer of raw data.
Provides information on the quality of
the value transfer of calculated data.
No bounding values were found at the
start or end time.
No raw data was found for the
specified period.
Raw data was not completely archived
during the selected period.
Function Manual, 05/2012, A5E02780178-02
Quality
GOOD
BAD
UNCERTAIN
GOOD
BAD
UNCERTAIN
BAD
BAD
BAD
OpenPCS 7