When configuring the process monitoring in the RFC2790, there are two options:
1. Alarm when "Process Count is less than X"
2. Alarm on "Process Stop"
If you want the alarm to automatically clear when the process comes back up you need to utilize ONLY the Alarm when "Process Count is less than X" option. If you have both the Alarm when "Process Count is less than X" and the Alarm on "Process Stop" the alarm will still not clear. The Alarm On "Process Stop" functionality was designed so that a user would need to clear the alarm (and keep in mind once a user clears the alarm it will not regenerate UNTIL after the issue has been resolved and there is a problem again). If you want the alarms to automatically clear then make sure you deselect the option for "Process Stop" in the process monitor window.