EPICS Component Reference Manual
This menu is used for the PRIO field of all record types.
It controls the relative priority of records scheduled with SCAN=Event or SCAN=I/O Intr,
and also of records that use asynchronous completion.
Index Identifier Choice String 0 menuPriorityLOW LOW 1 menuPriorityMEDIUM MEDIUM 2 menuPriorityHIGH HIGH
The number of priorities is set in various other places in the code too, so adding new entries to this menu will probably break the IOC build.