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About the Asset Health Services

When you deploy the Asset Health Manager, Process Data Integration, and Policy Designer modules together, the services used by each module interact with each other in various ways. This topic summarizes those services and describes a standard system architecture containing the components used by all three modules.

For a list of tasks that you must complete to deploy each module, refer to the following topics:

• Deploying Asset Health Manager (AHM) for the First Time
• Deploying Policy Designer for the First Time
• Deploying Process Data Integration (PDI) for the First Time

Services Summary

The following services are used by the Asset Health Manager, Process Data Integration, and Policy Designer modules:

• Asset Health Indicator Service: Automatically updates the following field values in a Health Indicator record when reading values related to the health indicator source record (e.g., an OPC Tag or Measurement Location record) change:

  • Alert Level
  • Last Reading Date
  • Last Char Reading Value (for records that accept character values)
  • Last Numeric Reading Value (for records that accept numeric values)

  This service also facilitates the automatic creation of Health Indicator records for configured sources.

• Policy Trigger Service: When an input to a policy (i.e., an associated record in the GE Digital APM database or reading value in the process historian) changes or when a policy schedule is due, a message is added to the policy trigger queue. The Policy Trigger Service monitors the trigger queue. When it receives a message, it determines which policy instances should be executed for the message, and then it sends corresponding messages to an appropriate policy execution queue.
• Policy Execution Service: The Meridium Policy Execution Service handles the execution of policies. Specifically, the Policy Execution Service monitors a corresponding policy execution queue and executes the policy instances that are added to it.
• Process Data Integration (PDI) Service: Monitors the subscribed tags (i.e., tags that are used in policies and health indicators or tags for which readings are being stored in the GE Digital APM database) and, when data changes occur on these tags, adds messages to the appropriate queues. This service also facilitates the automatic import and synchronization of tags from a configured process historian.

Example: Standard System Architecture Configuration

The following diagram illustrates the machines in the GE Digital APM system architecture when the Policy Designer, Process Data Integration (PDI), and Asset Health Manager (AHM) modules are used together. This image depicts the standard configuration, where the OPC Server software and the Process Data Integration Service are on the same machine.

Note: In this example configuration, only one machine of each type is illustrated. Your specific architecture may include multiple GE Digital APM Servers, multiple OPC Servers, or multiple GE Digital APM Servers used for policy executions.

The following table summarizes the machines illustrated in this diagram and the software and services that you will install when you complete the first-time deployment steps for Asset Health Manager, Process Data Integration, and Policy Designer.

• GE Digital APM Installation and Upgrade

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