Table of Contents
Advertisement
Compare
Compare can be used instead of an Alarm's output to control a relay. It can also provide on/off control
with hysteresis.
Compares 2 inputs. Call the result of this comparison "Result". Result is a pulse that goes ON(1) when
comparison is true, and OFF(0) when comparison is not true. If hysteresis is given a value, then Result
will not go OFF(0) until hysteresis value is exceeded. Result is then processed according to the
specified condition type and condition time. The final output is a discrete pulse CVn OS.
Table 4-19 and Table 4-20 describe the Compare prompts. See Table 4-2 for additional prompts.
Prompt
INPUT #1
OFF, analog parameter,
number
INPUT #2
OPERATOR
EQ, GT, LT, GTE, LTE, NEQ
HYSTERESIS
Number, OFF
CONDITION TYPE
NONE, DELAY, EXTEND,
PULSE, RT PULSE
CONDITION TIME
OFF or number
COMPARE
Input #1
OPERATOR
Input #2
&
HYSTERESIS
Figure 4-2 Compare Signal Flow
Table 4-19 Compare Prompts
Range/Selections
Video Recorder – User Manual
Programming Function Blocks and Features
CONDITION
TYPE
Result
&
CONDITION
TIME
Input sources to be compared.
The Result will be set to ON(1) when the comparison is true:
Input #1 OPERATOR Input #2
where OPERATOR is:
EQ(=), GT(>), LT(<), GTE ( ), LTE ( ), NEQ( )
The Result will be set to OFF(0) when the comparison is false.
Applies to all operators except EQ and NEQ. If given a value,
hysteresis determines when Result goes OFF(0) after the
comparison becomes false.
Operator
Hysteresis Function
GT:
Result goes OFF when Input #2 - Input #1 Hyst
GTE:
Result goes OFF when Input #2 - Input #1 > Hyst
LT:
Result goes OFF when Input #1 - Input #2 Hyst
LTE:
Result goes OFF when Input #1 - Input #2 > Hyst
See Figure 4-3.
See Table 4-20.
Enter number of seconds of condition time. See Table 4-20.
CVn OS
Definition
109
Advertisement
Table of Contents
