Boolean Values

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Boolean Values

In VBScript, 0 (zero) is equal to False and any other value different from zero is considered as True. As an example, consider a Tag representing a digital input or output, therefore its values are 0 (zero) or 1 (one). When using Tag values for Links with Boolean-type properties, Elipse Power considers the values indicated on the next table.

Tag value for Boolean data types

Tag

VBScript

0

False

1

True

 

When using a NOT command, Elipse Power considers the values indicated on the next table.

Tag value with a NOT command

Tag

NOT Tag

VBScript

0

-1

True

1

-2

True

 

Therefore, NOT of 1 (one) is not False, because its value is not equal to 0 (zero). In case users want to use a NOT command, first convert a Tag value to a Boolean using the CBool method.

Converting Tags using the CBool method

Tag

CBool(Tag)

NOT CBool(Tag)

0

False

True

1

True

False

 

Using the CBool method

Using the CBool method

Another option is to work with Tag's Bit00 property, which is already a Boolean property, instead of working with Tag's Value property.

Using the Bit00 property

Using the Bit00 property

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