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1.1 Features
1
OVERVIEW
(3) Buffering function for reliable data acquisition/transmission
(a) Even if the frequency of data transmission triggers is high, no trigger will be
missed. (Trigger buffering function)
When multiple sets of conditions for data transmission are met in a concentrated
manner, their data and trigger times can be buffered in the module's internal
memory.
After the loads are reduced, data operations and transmission are executed using
the buffered data.
Figure 1.4 Data buffering in the case of load concentration
[When loads are concentrated]
Trigger buffer
Job 1-1)
Trigger conditions
met
Time
Job 1-2) Trigger information (Tag data, time)
Job 3-3) Trigger information (Tag data, time)
Job 1-1)
Action
execution
Time
Sending
data
[MES interface module]
After loads have been reduced
[When loads are reduced]
Time Time
Sending
data
Trigger buffer
Job 1-2)
Action
execution
Job 3-3)
Action
execution
Job 1-2)
Trigger conditions
met
Job 3-3)
Trigger conditions
met
Database
Database
After completing the action of Job 1-1),
executes actions of Job 1-2) and 3-3)
in this order based on the trigger buffer
information.
Executes action of Job 1-1), and
stores trigger information of Job 1-2)
and 3-3) in the trigger buffer.
The numbers 1) to 3) show the order in which trigger conditions of respective jobs are met.
Job 1 and 3 are assumed to access the same database.