Siemens SIMATIC PCS 7 Function Manual page 77

Example
The following table lists the parameters and their meaning and shows suitable examples.
Parameter
hMode =
read
hMode =
advise
htStartTime
htEndTime
bBounds =
FALSE
bBounds=
TRUE
OpenPCS 7
Function Manual, 05/2012, A5E02780178-02
Meaning
Outputs archived messages and
events of a defined period in the past
(comparable with ReadRaw in OPC
Historical Data Access).
Outputs archived messages and
events starting from a defined time.
After receiving all archived
messages, new messages are sent
as with an active subscription. This
is comparable with AdviseRaw in
OPC Historical Data Access.
Specifies the time at which the
messages and events are read from
the archive.
Specifies the time up to which
messages and events are read from
the archive. if "hMode = read" ist is
set, "NOW" is used as the default
setting.
● The time stamp of the first
transferred message
>= htStartTime
● The time stamp of the last
transferred message
<= htEndTime
● The time stamp of the first
transferred message
<= htStartTime
● The time stamp of the last
transferred message
>= htEndTime
FALSE is the default setting.
6.6 OPC Historical Alarms and Events (OPC "H" A&E)
Example
Setting a filter to read archived
messages over the last 30
minutes:
OPCHAEServer hMode=read
htStartTime=NOW-30M
bBounds=TRUE
Reading archived messages as of
the last 30 minutes:
OPCHAEServer hMode=advise
htStartTime=NOW-30M
The subscription must be active
for this purpose.
htStartTime=NOW-30M
htEndTime =
2011-09-10T10:00:00.000C
bBounds=FALSE
bBounds=TRUE
OpenPCS 7 interface
Requireme
nt
Yes
Yes
Yes
optional
optional
optional
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