Honeywell VRX180 - Manual (Page 162)

Programming Function Blocks and Features
Video Recorder – User Manual 148
Destination defined
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.
LP 1
GAIN #1 = 5.00
CV 1 OV
CN 1
VALUE CV 1 OV
DEST = LP 1 GN
Figure 4-16 Example of Constant Destination
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.