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The Preventive Maintenance Engine can automatically generate preventive maintenance (PM) service requests and actions (or activities), triggered by elapsed time, asset usage, measurement thresholds, or events (see Figure 38):
- Time-based triggers call for maintenance actions at regular time intervals.
- Usage-based triggers are for equipment that can keep track of usage with a counter (for example, number of copies for photocopiers).
- Threshold-based triggers initiate a service activity when a measurement falls above or below a set level (similar to an alarm or engine warning light).
- Event-based triggers use predefined events to determine if a PM activity is required.
When a PM activity is required, you use Field Service to create service requests and detailed activities. Figure 38 shows the process of the Preventive Maintenance Engine, which is:
- Run the PM Engine for an asset or an agreement.
- Select the PM Plan for the asset or for the entitlement's assets.
- For each trigger, if conditions require an action, create service requests or activities, and then run the PM Engine. If conditions do not require an action, run the PM Engine.
- Continue the process until all necessary service requests and activities have been created.
Figure 38. Logic of the Preventive Maintenance Engine