Table 4-22 Math Prompts; Figure 4-5 Math Cv Feedback Programming - Honeywell VPR100 User Manual

Programming Function Blocks and Features
Math
Performs math on up to 8 inputs using a single operator. Output is CVn OV. Divisio n by 0 is indicated by
CVn OV's displayed value flashing 0.
Table 4-22 describes the Math prompts. See Table 4-2 for additional prompts.
Prompt
INPUT A - INPUT H OFF, analog parameter,
number. If connecting to an
upstream loop, that loop
output (LP# OV) MUST be
INPUT A (see Feedback).
OUTPUT LOW LIMIT Enter limits
OUTPUT HIGH LIMIT
OPERATOR ADD, SUBT, MULT, DIV,
ABSVAL, SQRT and
STDDEV.
FEEDBACK OFF, analog parameter,
number
114

Table 4-22 Math Prompts

Range/Selections
BC
FB
PID

Figure 4-5 Math CV Feedback Programming

VPR & VRX – User Manual
Definition
Enter up to 8 input sources.
Displayed output value will be clamped and will flash when
these limits are exceeded.
1. Input1 OPERATOR Input2 OPERATOR...Input8
where OPERATOR is one of these:
add, subtract, multiply, or standard deviation
(Standard Deviation uses all inputs.)
Example: Input1 minus Input2 minus ...Input8.
2. OPERATOR Input1
where OPERATOR is absolute value or square root.
3. Input1 OPERATOR Input2
where OPERATOR is divide.
Note: Inputs 3-8 are not used in division.
Select LP# BC or AO# BC to propagate the back calculation
(BC) value from a downstream loop or AO. Also, program
the upstream loop's feedback with this Math CV's back
calculation value (CV# BC). You MUST program this CV's
feedback to NONE if this CV is not used as part of a control
loop output configuration (Figure 4-5). If it is part of a loop
configuration, the math operator cannot be ABSVAL, SQRT,
or STDDEV.
FB
MATH
INP 1
CV
BC
PID
OR
AO
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