Table 4-19 Compare Prompts; Figure 4-3 Compare Signal Flow - Honeywell VPR100 User Manual

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
12/00
COMPARE
Input #1
OPERATOR
Input #2
&
HYSTERESIS

Figure 4-3 Compare Signal Flow

Table 4-19 Compare Prompts

Range/Selections
VPR & VRX – User Manual
Programming Function Blocks and Features
CONDITION
TYPE
Result CVn OS
&
CONDITION
TIME
Definition
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
Result goes OFF when Input #2 - Input #1 ≥ Hyst
GT:
GTE: Result goes OFF when Input #2 - Input #1 > Hyst
Result goes OFF when Input #1 - Input #2 ≥ Hyst
LT:
LTE: Result goes OFF when Input #1 - Input #2 > Hyst
See Figure 4-4.
See Table 4-20.
Enter number of seconds of condition time. See Table 4-20.
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