Honeywell VRX180 - Manual (Page 129)

Programming Function Blocks and Features
Video Recorder – User Manual 115
Free Form Math
The output CVn OV is the result of a user-specified equation. QWERTY keyboard may be used for
easier equation entry.
Table 4-23 describes the Free Form Math prompts. See Table 4-2 for additional prompts.
Table 4-23 Free Form Math Prompts
Prompt Range/Selections Definition
OUT LOW LIMIT
OUT HIGH LIMIT
OFF or number
•
Displayed output value will be clamped and will flash
when these limits are exceeded.
EQ See Table 4-24.
•
Enter the equation using the keyboard.
•
See Table 4-24 for allowable characters and functions.
•
Enter up to 64 characters (upper or lower case)
•
Spaces are permitted.
•
Enclose a function’s argument with parentheses ().
•
Square root argument must be absolute value to prevent
square root of a negative value.
•
Only whole numbers may be used as exponents.
Example: To input this equation
CN 5 OV X 12
AI 1 OV
AI 2 OV
5
+
enter these settings:
INPUT A: CN5OV
INPUT B: 12.0
INPUT C: AI1OV
INPUT D: AI2OV
EQ: A*B*SQRT (ABS(C/D))+5
Note how constants can be entered through the Constant
function block (as in example’s Input A), assigned to an input
(as in example’s Input B), or entered directly in the equation
(as in example with 5).
INPUT A - INPUT H OFF, analog
parameter, number Enter the parameters or numbers to be used in the equation.
RESET OFF, discrete
parameter, 0, 1
Resets the function block. Use only when the equation result
is the input to itself (integrating); that is, when the equation
contains the letter O.