Unreliable Thinning Model

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Unreliable Thinning Model

The unreliable thinning model deletes all records for all point types (analog, digital, enumeration, and string) that are marked as unreliable.

Unreliable Thinning Model Properties

Property	Description
Starting at day	Specifies the number of days between today and timestamp of an entry. Must be a value greater than 0; no thinning can occur on entries from the current day. Example A day value of 60 would correspond to all entries at least 60 days older than today.
Respect Force on Update	If enabled, the thinning rule will respect the Force Evaluation on Update without changed value setting for each point record. If Force Evaluation on Update is not enabled, any value that is identical to the previous value will be deleted, after deleting all unreliable values. Note: This option allows the history values to appear as if no unreliable records were ever sent to the VHS.

Property

Description

Starting at day

Specifies the number of days between today and timestamp of an entry. Must be a value greater than 0; no thinning can occur on entries from the current day.

Example

A day value of 60 would correspond to all entries at least 60 days older than today.

Respect Force on Update

If enabled, the thinning rule will respect the Force Evaluation on Update without changed value setting for each point record. If Force Evaluation on Update is not enabled, any value that is identical to the previous value will be deleted, after deleting all unreliable values.

Note: This option allows the history values to appear as if no unreliable records were ever sent to the VHS.

To Create an Unreliable Thinning Model

On the Configure Thinning Models dialog box, click Create Model.
Type a Model Name. This name should fully identify the model to ease selection of the appropriate model when creating rules.
Select the Unreliable page.
Type the Starting at day value and set Respect Force on Update, if desired.
Click Save Model. To discard all changes click Cancel.

To make changes to an existing model, select the model from the list and click Edit model.
To delete an entire model highlight the model name and click Delete Model. Models may only be deleted if no rules are currently set to use the model.

Click OK to return to the Configure Thinning Rules dialog box.

To Edit an Existing Unreliable Thinning Model

On the Configure Thinning Rules dialog box, select an existing thinning rule, and click Edit Rule.
On the Configure Thinning Rules dialog box, select an existing thinning rule, and click View/Edit Models.
Select an existing Unreliable thinning model, and click Edit Model.
Edit the model as described in steps 3 -6 above.

Unreliable Thinning Model Example

Sample Unreliable Thinning Model

In the example above, history values newer than 30 days would not be subject to thinning. All values for all point types that are marked as unreliable and older than 30 days would be thinned. Additionally, if Force Evaluation on Update is not enabled for a point record, any value that is identical to the previous value will be deleted, after deleting all unreliable values.