FALCON
USER GUIDE
EN2Z-0962GE51 R0715
206
Cycle Time (400 msec)
Excecution Time (300 msec)
Very Fast
100
100 msec remaining
time in
Very Fast
category =>
500 msec execution time in
Slow
category
Cycle Time (2000 msec)
Excecution Time (500 msec)
Slow
Time (msec)
500
1000
2000
1500
100
100
100
100
Excecution Time
Cycle Time
Cycle Time
Category
The diagram illustrates, that the degree of execution of a control loop having a slow
cycle time category assigned, depends on the remaining time (=cycle time minus
execution time) provided by a control loop executed in very fast cycle time.
The target cycle time should not be exceeded during control loop execution. If a
category's execution time is permanently greater than the corresponding target
cycle time, the controller is overloaded and the target cycle time should be changed
by increasing it to higher values than the execution time.
IMPORTANT
It is recommended to set the cycle times to values to between 30 % and
50 % higher than the execution times in order to make sure that control
loops having medium and slow cycle times assigned can be executed in
appropriate time.
NOTE: The settings done in the Excel Web HTML interface will be overwritten after
a download with CARE. Hence, upload the application into CARE using
Excel Online after the plant has been setup.
Procedure
1.
In the tree, expand the
Advanced
item, then the
System Settings
item and click
on
Cycle Time Categories
.
RESULT: On the
Cycle Times Categories
tab on the right, the following is
displayed:
•
Category
The cycle time category defines the time in ms after a control
loop is restarted automatically (values see
Target Cycle Time
column).
•
Target Cycle Time (ms)
Target cycle times are grouped in the following categories:
Slow, Medium, Fast, Very Fast.
•
Actual Execution Time (ms)
The actual execution time is displayed for comparison in the
Actual Cycle Time
column.
2.
To change the target cycle time, enter the value for the category in the
Target
Cycle Time
(in ms)
column. Note that the minimum cycle time in ms can only be
increased but not decreased.
3.
To save changes, click the SUBMIT button.
NOTE: Cycle time categories are only displayed and changeable if your
access level is equal to or higher than the access level defined for
these actions under User Administration.
Содержание Centraline FALCON
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Страница 24: ...FALCON USER GUIDE EN2Z 0962GE51 R0715 20 Fig 7 Open BACnet LON System Architecture for Plant Control ...
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