Concepts

Tasks

Settings

Configuring ODC Reading Creation Rules

Reading creation rules specify when the readings taken by an ODC service are recorded as indicator readings. Not all readings need to be recorded, so you can define rules that set conditions for required readings. ODC services must also be configured to monitor readings through a defined time schedule that determines when and at what frequency readings are collected.

To Configure an ODC Reading Creation Rule

1.	Open an asset indicator that has been configured to collect readings from an online source. Select the ODC tab.

Note: The ODC tab only appears if the collection method is set to Collected from an on-line source on the General tab.

2.	On the ODC Rules tab, click New. The ODC Reading Creation Rule dialog appears.

3.	Enter a name for the rule.

4.	Select when you want to have an indicator reading created in APM:

Setting Name

Description

Rule for creating readings

Select when you want readings to be created: • Every time the indicator is polled: select this option to always have a reading created when data is received from the tag. • When all of the following conditions are true: Creates a reading under the conditions that you define on the rule. You can use any combination of the options below the rule to evaluate whether a new reading should be created. If you select more than one option, the evaluation criteria will be logically “ANDed” together. This means that a reading will only be created if all of the criteria are true. You must select at least one option.

The value changes by more than

Enter the threshold amount in this box. For example, you might only want a new reading if the temperature has changed by more than two degrees Celsius in either direction. This option is only available for numeric indicators.

The indicator’s state changes

Select this option to have an indicator reading created when the indicator’s state is different from the last reading taken. Applies to indicators with states and descriptive indicators.

The indicator’s state is one of

Select this option to have an indicator reading created for selected states. Select the appropriate states in the table. Applies to indicators with states and descriptive indicators.

5.	Select the Quality tab.

6.	Specify how the ODC service responds when the reading’s quality is “bad” or “uncertain”. Your choices are to create a reading anyway, create a reading that is marked “incorrect” with the reason “uncertain” or “bad”, or ignore the reading and go on to the next one.

Note: Typically, quality applies to OPC data sources. However, if the plugin does not support the concept of quality, “good” quality is assumed.

7.	On the Description tab, you can enter a information about the rule.

8.	Select the Polling Schedule tab.

9.	Click Browse and select a polling schedule.

10.

Click OK.

11.	When you are finished, save the indicator and close the window.

Note: Any time that you make a change to a polling schedule or an ODC indicator, you must refresh the ODC service provider. From the Enterprise window, click the Services view and then the Servers tab. Locate the service provider, right-click it, and click Refresh Service.