Rockwell-automation FactoryTalk Historian SE DataLink 4.2 User Guide Uživatelský manuál stáhnout pdf (Strana 109)

8 ● Supplementary Information

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101

FactoryTalk Historian Expression Examples

These examples use the tag delimiters : (colon) and . (period). Your

FactoryTalk Historian system may use different delimiters.

The following expression determines the sum of the value of sinusoid

cubed and the value of cdf144 divided by 10:

(('sinusoid')^3 + 'cdf144'/10)

The expression below evaluates to true (non-zero) if the absolute value of

the tag mytag is at least 14.65.

(abs('my:tag') >= 14.65)

When comparing digital tags, use the negative of the digital state code

number. For digital tags, use the digital state string itself. For example:

('my:tag' = "Manual")

The following expression evaluates to True if the value of the tag sinusoid

is less than 45 and the square root of the value of the tag vdf1002 is

greater than 2:

('sinusoid' < 45 and sqr('vd:f1002') > 2)

Manual Function Entry

FactoryTalk Historian DataLink provides tools that can be used to build

any FactoryTalk Historian DataLink function graphically. Experienced

users of Excel and FactoryTalk Historian may prefer to enter functions

directly in the Excel formula bar.

The following topics apply to FactoryTalk Historian DataLink functions

when entered directly in this manner.

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Rockwell-automation FactoryTalk Historian SE DataLink 4.2 User Guide Uživatelský manuál Strana 109