Rockwell Automation 1788-FFCT NI-FBUS Configurator User Manual - Manual (Page 55)

Publication 1788-UM052B-EN-P - April 2002
Using the NI-FBUS Configurator 4-27
Viewing and Editing a
Schedule The NI-FBUS Configurator automatically determines the execution
order and timing of the schedule based on your control strategy,
network and device factors, and on the loop execution rate you
choose. The NI-FBUS Configurator also automatically optimizes the
schedule. Double-click the Schedule icon in the Project window to
view or edit the link active schedule.
The NI-FBUS Configurator combines the link active schedule and
function block schedules into one diagram, as shown in Figure 4.14.
Figure 4.14 Schedule Window
In the Schedule window, a key of the scheduled objects appears on
the left. The timing diagram on the right displays the execution times
of the function blocks, and when data is transmitted on the bus.
The blue bars on the screen correspond to the function block
execution times and the red bars correspond to the data transmission
times, which consist of LAS notification time and transmission time.
To change the execution time for a loop, click the Loop Time next to
the loop icon and type in the new time.
TIP
An optimized schedule can show that the
transmission time overlaps the end time for the
function block because the transmission time
includes the time that the LAS uses to tell the device
to send the data.