Honeywell VRX180 - Manual (Page 86)

Programming and Operating Concepts
Video Recorder – User Manual 72
Also typical in the execution of a set point profile is the generation of discrete events during each profile
step. Discrete events are simply status indicators that are programmed to assume either an ON or OFF
state during a step of a profile. As simple discrete status indicators, these events may, for example, be
used to initiate a logic control scheme on the process being controlled upon the occurrence of a
particular profile segment. In this product, note that up to 16 discrete events may be programmed per
segment. See Figure 3-26.
& ' ( ) *
PROCESS
VALUE IN
ENGINEERING
UNITS
TIME
SEGMENT
#1
SEGMENT
#2
SEGMENT
#3
SEGMENT
#4
SEGMENT
#5
SP1 EVENT
#1
ON OFF ON ON OFF
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
SP1 EVENT
#16
OFF ON ON OFF ON
Figure 3-26 Up To 16 Discrete Events May Be Programmed Per Step Of A Set Point Profile
Discrete events, whose ON or OFF states depend on the step number of the profile they are associated
with, may be externalized using the discrete output hardware available in the instrument. Figure 3-
27features the function block diagram elements that represent how to program the instrument’s discrete
outputs so that their states coincide with those assumed by a profile’s discrete events.