Additional functions
13.3 ISVAR ( ) function call and read machine array index
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13-8 Programming Manual, 03/2006 Edition, 6FC5398-2BP10-1BA0
13.3 13.3 ISVAR ( ) function call and read machine array index
Function
The ISVAR command is a function as defined in the NC language that has a
• function value of type BOOL
• transfer parameter of type STRING
The ISVAR command returns TRUE if the transfer parameter contains a variable known in
the NC (machine data, setting data, system variable, general variables such as GUDs).
Programming
ISVAR(variable identifier)
or
ISVAR (identifier, [value, value])
Parameters
Variable identifier Transfer parameter of type string can be undimensioned,
1-dimensional, or 2-dimensional.
Name of identifier Identifier with a known variable with or without an array
index as machine data, setting data, system variable, or
general variable.
Extension:
For general and channel-specific machine data, the first
element of the array will be read even when no index is
specified.
Value Function value of type BOOL
Checks
The following checks are made in accordance with the transfer parameter:
• Does the identifier exist
• Is it a 1- or 2-dimensional array
• Is an array index permitted
Only if all these checks have a positive result will TRUE be returned. If a check has a
negative result or if a syntax error has occurred, it will return FALSE. Axial variables are
accepted as an index for the axis names but not checked.
Extension: Read machine data and setting data array without index.
If there is no index for general and channel-specific machine data, alarm 12400 "channel %
1 block % 2 array % 3 element not present" is no longer output.
At least the axis index must still be programmed for axis-specific machine data. Otherwise
alarm 12400 will be issued.
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