Emerson PNC001-A Series User Manual

PACSystems™ RX3i and RSTi-EP CPU Reference Manual Section 4
GFK-2222AK October 2019
CPU Operation 83
4.1.2 CPU Sweep Modes
4.1.2.1 Normal Sweep Mode
In Normal Sweep mode, each sweep can consume a variable amount of time. The Logic
window is executed in its entirety each sweep. The Communications windows can be set
to execute in a Limited or Run-to-Completion mode. Normal Sweep is the most common
sweep mode used for control system applications.
The following figure illustrates three successive CPU sweeps in Normal Sweep mode. Note
that the total sweep times may vary due to sweep-to-sweep variations in the Logic
window, Communications windows, and Background window.
Figure 11: Typical Sweeps in Normal Sweep Mode
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
BG
Abbreviations:
HK = Housekeeping
CC = Controller Communications Window
BPC = Backplane Communications Window
BG = Background Window

Emerson PNC001-A Series Specifications

General

Brand	Emerson
Model	PNC001-A Series
Category	Controller
Language	English