Siemens SIMATIC PCS 7 FOUNDATION Fieldbus Commissioning Manual page 50

Engineering
5.3 Parameter assignment
"Calculate Schedule" button"
● Click this button to calculate the time for cyclic communication.
"Optimize macrocycle" button
● Click this button to set the macrocycle as follows:
Depending on the cyclical component (depending on the configured hardware), a minimum
macrocycle is set with a specified acyclical percentage.
Graphical display
Before downloading, click the "Calculate schedule" button. With the help of the display you
can check whether the configuration is consistent. The result is displayed graphically.
Display from left to right:
Left area
The colored area on the left side indicates the percentage of acyclic communication.
Left thin dividing line (50% of the bus load)
The lower limit of the percentage of acyclic communication of the bus load recommended in
the FF specifications.
Thick dividing line
The limiting value set in the entry field "Percentage of acyclic communication".
Right thin dividing line (70% of the bus load)
The upper limit of the percentage of acyclic communication of the bus load recommended in
the FF specifications.
Right area
The colored area on the right side indicates the percentage of cyclic communication.
Meaning of the colored areas
Color
Yellow
Dark green
Light green and dark
green
50
Meaning
Percentage of acyclic communication
Percentage of cyclic communication
Configuration is free from errors.
Configuration is free from errors.
The cyclic communication portion is
shown in dark green.
The light green portion identifies the
time that is reserved for cyclic commu‐
nication but is not needed.
Recommendation/notes
-
-
You can reduce the time for the mac‐
rocycle of a specified acyclic portion.
FOUNDATION Fieldbus
Commissioning Manual, 02/2015, A5E32711026-AC