Siemens SINUMERIK 840D sl Commissioning Manual page 709

//M(SCREEN FORM1)
CHANGE()
...
CALL("UP1")
...
END_CHANGE
...
//END
6.3.3 Check Variable (CVAR)
Description
You can use the CVAR (CheckVariable) function to run a scan to ascertain whether all or
only certain variables or Help variables in a screen form are error-free.
It may be useful to check if variables contain a valid value before an NC code with the GC
function.
A variable is error-free if the state of the variable Identifier.vld = 1.
Programming
Syntax:
Description:
Parameters:
SINUMERIK Integrate Run MyScreens (BE2)
Programming Manual, 03/2013, 6FC5397-1DP40-3BA1
; Call subroutine and execute
VarN
CVAR( )
Checks variables for valid content
VarN List of variables to be checked.
Up to 29 variables, each separated by a comma, can be
checked. A character length of 500 must not be exceeded.
The result of the scan can be:
1 = TRUE (all variables have valid content)
0 = FALSE (at least one variable has invalid content)
Programming commands
6.3 Functions
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