Emerson PACSystems RX3i - Parts of the CPU Sweep; Figure 10: Major Phases of a Typical CPU Sweep

PACSystems™ RX3i and RSTi-EP CPU Reference Manual Section 4
GFK-2222AK October 2019
CPU Operation 79
4.1.1 Parts of the CPU Sweep
There are seven major phases in a typical CPU sweep as shown in the following figure.
Figure 10: Major Phases of a Typical CPU Sweep
Prog
window
scheduled
?
no
yes
Communications
Controller
Window
Comm
window
scheduled
?
yes
no
Backplane
Communications
Window
Start next sweep
SWEEP
Background
task
scheduled
?
Background task
Window
yes
no
Application Program
Task Execution
(Logicwindow)
WINDOW)
Start-of-Sweep
Housekeeping
input scan
Output Scan