Honeywell VRX180 Manual De Usuario

 

INPUT SOURCE 

Enter OFF, analog 
parameter, number as the 
analog output source. 

For a control loop, this is typically set to a control output 
(LP# OV).  However, it may be directed to any analog value, 
such as a calculated value, to retransmit the value to an 
external device. 

INPUT LOW LIMIT 

INPUT HIGH LIMIT 

If the AO's input source is a 
PID control loop, specify a 
high value of 100 and a low 
value of 0. For other input 
sources, specify limits using 
the same units as the AO's 
input source. 

Input limits.  (Variable input limits are available by 
programming a constant's Destination with HS or LS.  See 
Program Constants, Section 4.16.) 

OUTPUT LOW LIMIT 

OUTPUT HIGH LIMIT 

For CAT, enter any output 
range within 0-20 mA 

These limits scale the output to the input limits.   

For a CAT output a low limit of 4 and high limit of 20 will 
provide a 4-20 mA output range. 

INC SLEW LIMIT 

DEC SLEW LIMIT 

Enter OFF or 0.1 to 999.9 
units/minute (units of the 
AO's input source). 

Limits the rate of increase or decrease of the analog output. 
Value entered is in terms of the AO's input source, not in 
terms of the output as defined by OUTPUT LOW LIMIT & 
OUTPUT HIGH LIMIT.  (Variable slew limits are available by 
programming a constant's Destination with IS or DS.  See 
Program Constants, Section 4.16.) 

FAILSAFE NONE 

 

UP (Upscale)  

DOWN (Downscale)  

VALUE 

Select failure action to occur on input signal loss. If VALUE is 
selected, enter the value desired in FAILSAFE VALUE 

FAILSAFE VALUE 

Enter a value between Input 
Low Limit and Input High 
Limit or analog parameter or 
OFF. 

The value at which the output will be held for failsafe.  This 
value is also the initial output of the loop on "cold start".  If 
the value is set to OFF, the output will go to 0.  Value entered 
is in terms of the AO's input source, not in terms of the output 
as defined by OUTPUT LOW LIMIT & OUTPUT HIGH LIMIT. 

IMPULSE TIME 

OFF or 

≥

 1 

The cycle time (in seconds) for On and Off time of the output. 
For example, a time of 150 seconds will cause the output to 
be on for 75 seconds and off for 75 seconds when the input 
source is at 50%.  (Variable impulse time is available by 
programming a constant's Destination with IT. Program 
Constants, Section 4.16.)