Rockwell-automation FactoryTalk View Site Edition Users Guide Uživatelský manuál stáhnout pdf (Strana 21)

xxi

ONTENTS

• • • • •

Setting up keys to run FactoryTalk View commands ...............................................19– 6

General rules governing precedence..................................................................19– 7

Precedence and the

F1 key................................................................................19– 7

Precedence and embedded ActiveX objects......................................................19– 7

Precedence and embedded

OLE objects ..........................................................19– 8

Keyboard shortcuts............................................................................................19– 8

About navigation buttons ........................................................................................19– 10

How navigation buttons work..........................................................................19– 11

Creating a navigation button............................................................................19– 11

Viewing and clearing the navigation history...................................................19– 13

20• Creating expressions..................................................................... 20–1

About expressions .....................................................................................................20– 1

Where you can use expressions in FactoryTalk View SE.................................20– 1

Working in the Expression editor .............................................................................20– 2

Expression components .....................................................................................20– 3

Checking the syntax of an expression ...............................................................20– 4

Cutting, copying, and pasting expressions ........................................................20– 4

Formatting expressions......................................................................................20– 4

Using tag names and tag placeholders in expressions ..............................................20– 5

Specifying the area with a tag name..................................................................20– 5

Using tag placeholders to specify tag values.....................................................20– 5

Using constants in expressions..................................................................................20– 5

Using operators to modify values in expressions......................................................20– 6

Arithmetic operators..........................................................................................20– 6

Relational operators...........................................................................................20– 7

Logical operators ...............................................................................................20– 7

Bitwise operators ...............................................................................................20– 8

Evaluation order of operators ............................................................................20– 9

Using built-in functions in expressions...................................................................20– 11

Math functions.................................................................................................20– 11

File functions ...................................................................................................20– 12

Time functions.................................................................................................20– 13

Tag functions ...................................................................................................20– 15

Security functions............................................................................................20– 17

Language function ...........................................................................................20– 18

FactoryTalk alarm functions............................................................................20– 18

Using if-then-else logic in expressions...................................................................20– 19

Nested if-then-else..........................................................................................20– 20

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 695 696

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