Campbell CR800 Dokumentacja Pobierz pdf (Strona 224)

Section 8. Processing and Math Instructions

The Or operator also performs a bit-wise comparison of identically positioned

bits in two numeric expressions and sets the corresponding bit in result

according to the following truth table:

If bit in expr1 is And bit in expr2 is The result is

0 0 0

0 1 1

1 0 1

1 1 1

Or Operator Example

The example sets Msg that depends on the value of variables A, B, and C,

assuming that no variable is a Null. If A = 10, B = 8, and C = 11, the left

expression is True and the right expression is False. Because at least one

comparison expression is True, the Or expression evaluates True

Dim A, B, C 'Declare variables.

A = 10: B = 8: C = 11 'Assign values.

If A > B Or B > C Then 'Evaluate expressions.

Msg = True

Else

Msg = False.

End If

PeakValley (DestPV, DestChange, Reps, Source, Hysteresis)

PeakValley is used to detect peaks and valleys (local maxima and minima) in a

signal. When a new peak or valley is detected, the new peak or valley and the

change from the previous peak or valley are stored in variables.

Parameter

& Data Type

Enter

DestPV

Variable or

array

Variable or array in which to store the new peak or valley. When a new

peak or valley is detected, the value of the peak or valley is loaded in the

destination. PeakValley will continue to load the previous peak or valley

until the next peak or valley is detected.

DestChange

Variable or

array

Variable or array in which to store the change from the previous peak or

valley. When a new peak or valley is detected, the change from the

previous peak or valley is loaded in the destination. When a new peak or

valley has not yet been reached, 0 is stored in the destination. When Reps

are greater than 1, the array must be dimensioned to Reps+1. The additional

element is used to flag when a new peak or valley is detected in any of the

source inputs. The flag element is stored after the changes [e.g.,

changevar(Reps+1)] and is set to -1 (true) when a new peak or valley is

detected and set to 0 (false) when none are detected.

Reps

Constant

The number inputs to track the peaks and valleys for. Each input is tracked

independently. When reps are greater than 1 the source and DestPV arrays

must be dimensioned to at least the number of repetitions; DestChange must

be dimensioned to Reps+1.

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