You can use an interval monitor when you want to:
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Check for a condition at regularly timed intervals that can be expressed in seconds or if you need to check communications objects or links. Interval monitors are activated after the specified time interval has passed. Interval monitors should be used when the conditions being monitored should be checked on a regular basis and not at a specific time.
For example, you may have a monitor that checks to see when the DASD threshold exceeds a certain percentage. You may want to create an event program that clears certain output queues or runs a command to reclaim spool storage. To determine if the threshold value is exceeded, you could set this monitor to run at regular intervals.
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Monitor communications links and objects. If you specify a line, controller, or device to monitor, you can have the monitor attempt recovery on a failed object. You can also use interval monitors in your network to monitor communications links to determine if a system in the network has failed.
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Watch communications lines for failures and have an event program that attempts to reestablish communications.