Emerson PACSystems RX3i - Program Scheduling Modes; Window Modes; Figure 13: Typical Sweeps in Constant Window Mode

PACSystems™ RX3i and RSTi-EP CPU Reference Manual Section 4
GFK-2222AK October 2019
CPU Operation 86
Figure 13: Typical Sweeps in Constant Window Mode
CC
HK
INPUT
OUTPUT
CC
BPC
BG
LOGIC
SWEEP n+1
HK
INPUT
OUTPUT
CC
BPC
BG
SWEEP n
SWEEP n+2
HK
INPUT
OUTPUT
CC
BPC
LOGIC
LOGIC
CC
SYS
BG
Constant
Window
Time
Abbreviations:
HK = Housekeeping
CC = Controller Communications Window
BPC = Backplane Communications Window
BG = Background Window
4.2 Program Scheduling Modes
The CPU supports one program scheduling mode: the Ordered mode. An ordered
program is executed in its entirety once per sweep in the Logic Window.
4.3 Window Modes
The previous section describes the phases of a typical CPU sweep. The Controller
Communications, Backplane Communications, and Background windows can be run in
various modes, based on the CPU sweep mode. The following three window modes are
available: