Specifications

History Collection and Archiving

PlantScape Server and Client Configuration Guide 169

Gating Points, Parameters, and States

To avoid collecting inaccurate historical data (for example, a zero error on a flow

transmitter when the associated valve is closed or the pump off), you can define

the conditions under which data should be collected. You do this as follows:

Select a gating point from the drop-down list of points.

Select a parameter from the drop-down list of parameters.

Specify the state for that gating point in the State field.

For example, for a point monitoring a flow, you would probably only want to

collect history when the pump is running. In this case you would define:

• The gating point as the point ID of the point that monitors the pump

• The state of the gating point as ON (or whichever wording you have

configured for that state of the PV)

Note A history sample is still collected regardless of the gating state.

When the gate point is not in the gate state, the history samples for the point

are saved as a “bad value” and therefore will not affect history averages that

are calculated from the snapshots.

Viewing History Collection Configuration

You can view the points configured for history collection by selecting Configure

⇒

History

⇒

History Assignment to call up the History Collection displays.

Extended History 1-hour snapshot 7 days 170

8-hour snapshot 3 months 281

24-hour snapshot 1 year 368

Fast History 1 - 30-second

snapshot

1 hour 3670 - 122

History Types Intervals Default Retention Period

Duration Number of Samples

Table 8.3 Default Retention Periods (Continued)

plscpcg.book Page 169 Monday, May 28, 2001 10:11 AM