Description: Returns contents of a tag. Works only with ACTION commands. Mostly commonly used to pass the value of a tag to another command. @ is similar to GETVAL.
Syntax:
Tcl: ACTION Command @tagname
JScript: ACTION Command("@tagname");
VB Script: ACTION Command "@tagname"
Argument: tagname
Returns: Value of an analog, digital or text IO tag, Constant Point Tag, Calculation Tag, Accumulation Tag, local Screen Tag or Daq Tag.
See Also: GETVAL
The @ is a shortcut for GETVAL used with ACTION commands only. (Hint - If the command selected from the script dialog box is in CAPITALS, then @ will work.)
The @ does not work with tcl, JScript or VB Script keywords alone (i.e. built-in tcl commands like expr). The @ must be combined with an ACTION command if used with a tcl, JScript or VB Script. (Hint - If the command selected from the script dialog box is in lower-case, you must use [GETVAL ].)
Examples:
# tcl
LOGACT @Textag1
SETVAL AO101=@AO102
SETVAL {tag1=%ROTATEPLUS @speed}
// JScript
LOGACT("@Textag1");
SETVAL("AO101=@AO102");
Rem VB Script
LOGACT "@Textag1"
SETVAL "AO101=@AO102"
See 12.10.1 Transfer the value of a tag to another tag
10.5.7 Dynamic Animation Advanced button
Note about math (use GETVAL not @):
If you are using math, then you will have to use GETVAL instead of @, because @ can't be interpreted by Tcl, JScript or VB Script. The math is part of the script language. For example to Set a tag to 1/2 the value of another:
# tcl
SETVAL AO101=[expr [GETVAL AO102] * 0.5]
// JScript
var value1
value1 = GETVAL("AO102") * 0.5;
SETVAL("AO101=" + value1);
Rem VB Script
Dim value1
value1 = GETVAL("AO102") * 0.5
SETVAL "AO101=" & value1