Rockwell-automation FactoryTalk View Site Edition Users Guide Instrukcja Użytkownika Pobierz pdf (Strona 554)

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FACTORYTALK VIEW SITE EDITION USER’S GUIDE

20–8

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Bitwise operators

Bitwise operators examine and manipulate individual bits within a value.

The following table describes the bitwise operators.

OR, || or If either or both statements are true,

returns a 1.

(tag1>tag2) OR (tag1==5)

tag1==5 is true; returns a 1.

NOT negation Reverses the logical value of the statement

it operates on.

NOT (tag1<tag2)

Although tag1<tag2 is true, NOT reverses

the logical value; returns a 0.

The parentheses are essential in the these expressions. For more information, see “Evaluation

order of operators” on page 20-9.

Bitwise operators are for integers only, not for floating-point numbers.

Symbol Operator Action

& AND Compares two integers or integer tags on a bit-by-bit basis.

If both the corresponding bits in the original numbers are 1, it returns an

integer with a bit set to 1. Otherwise, the resulting bit is 0.

| inclusive OR Compares two integers or tags on a bit-by-bit basis.

If either or both of the corresponding bits in the original numbers are 1, it

returns an integer with a bit set to 1. If both bits are 0, the resulting bit is 0.

^ exclusive OR (XOR) Compares two integers or tags on a bit-by-bit basis.

If the corresponding bits in the original numbers differ, it eturns an integer

with a bit set to 1. If both bits are 1 or both are 0, the resulting bit is 0.

>> right shift Shifts the bits within an integer or tag to the right.

Shifts the bits within the left operand by the amount specified in the right

operand. The bit on the right disappears.

Either a 0 or a 1 is shifted in on the left, depending on whether the left-most

bit is a 0 or a 1. If the left-most bit is 0, a 0 is shifted in. If the left-most bit

is 1, a 1 is shifted in. In other words, the sign of the number is preserved.

<< left shift Shifts the bits within an integer or tag to the left.

Shifts the bits within the left operand by the amount specified in the right

operand. The bit on the left disappears and 0 always shifts in on the right.

~ complement Returns one’s complement; that is, toggles the bits within an integer or tag.

Reverses every bit within the number so every 1 bit becomes a 0 and vice

versa.

Symbols Operator Action Example

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