Honeywell VRX180 Manual De Usuario

To program Loops and Analog Outputs, you select the Program Control Loops or Program Analog 
Outputs from the Program Mode Menu, then program each menu item.  Some of these menu items, 
such as proportional band or slew limits, are function block parameters; that is, they can be 
programmed with numerical values only.  A Constant’s DESTINATION overrides that numerical value 
with a live value (variable) provided by the Constant’s VALUE. 

For example, suppose Loop1’s Gain #1 is programmed as the number 5.00, and Constant 1’s Value is 
CV 1 OV, the output of Calculated Value #2.  By programming Constant1’s Destination as LP1GN, 
Loop1’s Gain #1 will no longer be 5.00 but will be continuously updated by the live value provided by 
CV 1 OV. 

 

 

IMPORTANT 

Always be certain that the destination is compatible with its associated loop or analog output. A mismatched 
destination can affect your output and can be difficult to diagnose. Examples: If destination is AO1 IT (impulse 
time), be sure that AO1 is programmed as a DAT.  If destination is LP2 IS, be sure that Loop #2 is a type that 
has increased slew limit on its menu. 

 

ATTENTION 

•

 If the destination is used, the parameter being overridden by the destination cannot be accessed or changed.  

For example, Loop Gain cannot be tuned Online in the TUNE LOOP menu. 

•

 If you reprogram destination to another parameter or NONE, the original destination parameter maintains its 

last live value as determined by the constant’s value.  If you want the destination’s last live value to be zero or 
NONE: 

1.  change the constant value to zero or NONE, 

2.  change to Online mode for 5 seconds to override the previous live value with zero or NONE, 

3.  change back to program mode, 

4.  re-program constant’s destination to NONE. 

•

 If you program multiple constants with the same destination, only the highest numbered constant’s 

destination takes effect.  For example, if Constant #1 and Constant #5 both have destination = AO2 IT, then 
only Constant #5’s value is used by AO2 IT.