Honeywell VRX180 user manual Free Form Math Prompts, Input a CN5OV Input B

Programming Function Blocks and Features

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	OFF or number	•	Displayed output value will be clamped and will flash
			when these limits are exceeded.
OUT HIGH LIMIT
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 1OV + 5
			AI 2 OV
		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	Enter the parameters or numbers to be used in the equation.
	parameter, number
RESET	OFF, discrete	Resets the function block. Use only when the equation result
	parameter, 0, 1	is the input to itself (integrating); that is, when the equation
		contains the letter O.

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