Rockwell-automation FactoryTalk Historian SE DataLink 4.2 User Guide Uživatelský manuál stáhnout pdf (Strana 99)

8 ● Supplementary Information

●

Some functions also provide a field for a Filter Expression argument. You

can supply a filter expression to limit the values returned by a function, and

reference a filter expression in a worksheet cell.

Functions that may use these expressions include:

 Archive Value (page 34)

 Compressed Data (page 36)

 Sampled Data (page 39)

 Timed Data (page 41)

 Calculated Data (page 43)

 Time Filtered (page 48)

The following sections briefly outline FactoryTalk Historian expression

basics. FactoryTalk Historian DataLink supports all functional syntax,

operators and functions supported by the FactoryTalk Historian server.

For a full description of FactoryTalk Historian Performance Equations and

examples, see the FT Historian SE Applications User Guide.

Syntax

Follow these guidelines when writing FactoryTalk Historian expressions:

 Begin the expression with a single quote to force Excel to interpret the

expression as a string.

 Enclose tag names in the expression in single quotes.

 Type two single quotes for an expression that begins with a tag name.

Operators

The following operators are supported in FactoryTalk Historian

Expressions:

1 2 ... 94 95 96 97 98 99 100 101 102 103 104 ... 163 164

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Rockwell-automation FactoryTalk Historian SE DataLink 4.2 User Guide Uživatelský manuál Strana 99