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PI ICU reference for the PI OPC DA interface
Format of Timestamp Strings
Sets the format for time stamp strings read from or written to the OPC server. (/TF=format).
Number of Tags in Advise Group
Configure the maximum number of tags for each advise group created with scan class 1. The
recommended maximum is 800 tags per group, which is the default. Adjust this number
according to the OPC server requirements. (/AM=#)
Time Offset
If the OPC server node is set to a time zone other than the local time zone, this option directs
the PI OPC interface to adjust all the time stamps by the specified amount. To specify the offset,
use the format [-]HH:MM:SS. (/TO=offset)
Event Update Rate
Specify the requested update rate for the event class group. All event-based tags belong to the
same group and the default update rate for the group is one second. If the OPC server’s data
cache for event-based tags does not need to be updated every second, you can reduce load on
the OPC server by setting this parameter to a higher value (that is, a lower rate). For v2.0
servers, all events are read from the device, so this value can be set quite high unless there is
some other reason to update the cache.
Trend Advise
For advise tags, send the value from the preceding scan if the new value's timestamp is greater
than the number of scan periods (configured by the /TA flag). Enabling this setting causes
advise tags to behave as if the Step attribute is enabled.
DCOM Security settings
For detailed information about configuring DCOM security, refer to the OSIsoft DCOM Security
and Configuration Guide.
Default Authentication Level
Set the DCOM security authentication level (/DA) to one of the following:
• DEFAULT
• NONE
• CONNECT (default)
• CALL
• PKT
• PKT_INTEGRITY
• PKT_PRIVACY
Default Impersonation Level
Set the DCOM security Impersonation level (/DI) to one of the following:
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