Suppose that a certain motor is known to fail when it exceeds a temperature of 200 degrees. Part of the strategy for maintaining the motor might be to create a policy that continually monitors the motor's temperature.
In this example, temperature readings are gathered as DA Readings associated with an OPC Tag record.
Policy Model
Policy Logic Summary
If the temperature of the motor exceeds 200 degrees, an email message will be sent to the responsible analyst. This policy would likely be configured to execute automatically when records belonging to a policy instance are updated.
Individual Node Descriptions
| Node Name | Node Type | Description |
|---|---|---|
|
Temperature |
Represents the OPC Tag records whose associated reading values are inputs to the policy. The specific OPC Tag records that this policy monitors are identified by the policy instances belonging to this policy. |
|
|
Analyst |
Represents the user records whose information is used by the policy. The specific user records used by this policy are identified by the individual policy instances belonging to this policy. Note: User nodes represent records in the Security User and Human Resource families. |
|
| DA Reading Value > 200 |
Defines the logic that will be applied to values associated with the OPC Tag records that the OPC Tagnode represents. Specifically, this Condition node specifies that the policy logic will continue (i.e., an email message will be sent) only when a DA Reading Value is greater than or equal to 200. |
|
|
Email Contact |
Represents an action to send an email message. The email message will be sent to the email address defined in the specific user record that is included in the corresponding policy instance. |
Policy Instance
A policy instance that is associated with this policy might look like this:
...where:
- The specific OPC Tag record is A1113F.
- The specific user record contains the last and first name Smith, John.
When this policy is executed, if the OPC Tag record A1113F has a DA Reading Value that is greater than or equal to 200, the Meridium Enterprise APM system will send an email message to John Smith.
If you want to apply the same logic to monitor the temperatures of additional motors, you can define an additional policy instance for each specific OPC Tag record whose related DA Reading Values contain the temperature readings for the motors that you want to monitor.
