Mitsubishi Electric MELSEC Q Series User Manual page 151

(3) Function
The following are functions used in interrupts from the intelligent function module or interrupt module.
Function name
QBF_WaitUnitEvent
(4) Precautions
(a) Interrupt event is already notified when the QBF_WaitUnitEvent function is executed
When an interrupt event from the intelligent function module or interrupt module is already notified when the
QBF_WaitUnitEvent function is executed, the user program restarts from the interrupt event waiting status
simultaneously with the execution of the QBF_WaitUnitEvent function.
If multiple interrupt events with the same interrupt event No. at the time of the QBF_WaitUnitEvent function
execution are already notified, the user program processes them as a single interrupt event notification.
(b) Using the QBF_WaitUnitEvent function by multiple user programs
Do not enter the same CPU number or the same interrupt event number by multiple user programs.
Doing so result in the uncertain situation of which user program to receive the interrupt event.
C Controller module
(User program)
1) QBF_WaitUnitEvent function
2) Waiting for an interrupt event
4) User program resumed
Interrupt event notification
3) Interrupt issue
Waits for an interrupt event notification issued when an interrupt occurs from an intelligent
function module or an interrupt module.
CHAPTER 11 BASIC FUNCTIONS
Function
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