Precautions - Mitsubishi Electric Melsec Q Series User Manual

6
FUNCTIONS

6.1.11 Precautions

(1) Operation behavior of jobs
Sampling
interval
Figure 6.15 When trigger condition is met again during execution of the job set to [Value monitoring startup]
Sampling
interval
Figure 6.16 When trigger condition is met again during execution of the job set to [Value monitoring startup]
6
- 21 6.1 DB Interface Function
6.1.11 Precautions
(a) When a trigger condition for a job is met again during execution of the job
1) When [Trigger buffering] is disabled for the job
Because the job is being executed, it is not executed again.
Job startup
Job execution
2) When [Trigger buffering] is enabled for the job
The trigger information is stored in the trigger buffer, and after completion of
the current job execution, the job is executed based on the trigger information.
Trigger information 2)
Job
startup
Job execution 1)
(b) When trigger conditions for multiple jobs are met concurrently
• Up to three jobs can start their executions concurrently in the order in [Job
settings].
• After completion of these jobs, executions of the other jobs are started
sequentially.
Note that, if a job uses the same item in [Server service settings] that is
currently used for another job, the job is not executed until another job
execution is completed.
In addition, when multiple jobs for which [Trigger buffering] is enabled are set,
the next job is not performed until the execution of other jobs are complete.
(c) Monitoring interval timeout
Depending on the number of set jobs or the trigger condition setting, the
monitoring interval timeout may occur.
Job startup
Job execution
Another job is not executed during job execution.
3)
4)
Job Job
startup startup
2) 3)
Condition value
Tag component value
Job startup
Job execution
Condition value
Tag component value
Trigger buffer
Job Job
startup startup
4) 5)