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RSView Supervisory Edition Installation Guide

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Using the arrow keys at run time .......................................................................... 19-35<br />

Printing the trend chart at run time ...................................................................... 19-36<br />

Using overlays at run time...................................................................................... 19-36<br />

Fixing run-time errors............................................................................................. 19-37<br />

Chapter 20<br />

Creating expressions ...........................................................................................................20-1<br />

About expressions.......................................................................................... 20-1<br />

Where you can use expressions............................................................................... 20-1<br />

Using expressions in a command............................................................................ 20-2<br />

Expression components ........................................................................................... 20-2<br />

Creating expressions.................................................................................... 20-3<br />

Expression buttons.................................................................................................... 20-4<br />

Using the Check Syntax button............................................................................... 20-4<br />

Cutting, copying, and pasting expressions............................................................. 20-4<br />

Formatting expressions............................................................................................. 20-5<br />

Using tag names and tag placeholders in expressions....... 20-5<br />

Using area names with tag names ........................................................................... 20-6<br />

Using tag placeholders instead of tag names......................................................... 20-6<br />

Using constants in expressions............................................................ 20-6<br />

Using operators in expressions ............................................................ 20-7<br />

Arithmetic operators ................................................................................................. 20-7<br />

Relational operators................................................................................................... 20-8<br />

Logical operators ....................................................................................................... 20-9<br />

Bitwise operators ....................................................................................................... 20-9<br />

Evaluation order of operators ............................................................................... 20-11<br />

Using built-in functions in expressions ......................................... 20-13<br />

Tag functions............................................................................................................ 20-14<br />

Time functions ......................................................................................................... 20-17<br />

File functions............................................................................................................ 20-20<br />

xxiv <strong>RSView</strong> <strong>Supervisory</strong> <strong>Edition</strong> User’s <strong>Guide</strong>

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