Honeywell VRX180 Manual De Usuario

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. 

COMPARE

OPERATOR

&

HYSTERESIS

Input #1

Input #2

Result

CONDITION

TYPE

&

CONDITION

 TIME

CVn OS

 

Table 4-19 and Table 4-20 describe the Compare prompts.  See Table 4-2 for additional prompts. 

INPUT #1 

INPUT #2 

OFF, analog parameter, 
number 

Input sources to be compared. 

OPERATOR 

EQ, GT, LT, GTE, LTE, NEQ 

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. 

HYSTERESIS 

Number, OFF 

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. 

CONDITION TYPE 

NONE, DELAY, EXTEND, 
PULSE, RT PULSE 

See Table 4-20. 

CONDITION TIME 

OFF or number 

Enter number of seconds of condition time. See Table 4-20.