Common Elements is the set of features that are common to all of the languages in the IEC 61131-3 standard.
This table lists the common language elements supported by Fernhill SCADA:
| Language Element | Example |
|---|---|
| Comments | (* IEC 61131 style comment *) // A C++ style comment |
| Pragma | { Use "conversion-functions.script" } |
| Identifier | Litres Level_1 |
| Numeric Literals | -13 0 3.14159 16#FF INT#32767 |
| Duration Literals | T#12.5s Time#-1h t#14m30s |
| Date and Time Literals | D#2012-04-14 |
| String Literals | 'Some Text' "Wide Character Text" |
| Elementary Data Types | BOOL INT REAL TIME STRING |
| Boolean Edge Detection Types | BOOL R_EDGE |
| Generic Data Types | ANY_INT ANY_REAL ANY |
| Derived Data Types | STRUCT ... END_STRUCT, ARRAY [..] OF ... |
| Dynamic Data Types | OBJECT, VARIANT |
| Variable Declaration | VAR ... END_VAR |
| Variable Reference | A B[12] C.X |
| Tag Reference | %"Example Graphic.Tank Level" |
| Expressions | FlowRate * 2.4 |
| Program Unit | Program ... End_Program |
| Class Declaration | Class ... End_Class |
| Functions | ANY_TO_STRING( 5 ), SQRT( Value ) |
| Standard Function Blocks | TON( IN:=Start, ET:=T#30s ) |
To learn about using scripts in Fernhill SCADA.
For the meaning of terms used in Fernhill SCADA.