There is an event loop configuration in an EventDisp file.
The following is an example of a custom Event Pair rule configured in the $SPECROOT/custom/Events/EventDisp file:
0xfff00003 E 50 C 0x00c40030,1 R CA.EventPair, 0xfff00004, "0xfff00004 -:-", 300
0xfff00004 E 50 C 0x00c40030,1 R CA.EventPair, 0xfff00003, "0xfff00003 -:-", 300
In the above two Event Pair rules, if event 0xfff00003 occurs and is NOT followed by 0xfff00004 within 300 seconds, then generate 0xfff00004. Then if event 0xfff00004 occurs and is NOT followed by 0xfff00003 within 300 seconds, then generate 0xfff00003. This is causing a loop in the processing of these two events where one of these two events are logged every 5 minutes as seen below: