Siemens SINUMERIK 840D sl Function Manual page 24

Detailed description
3.3 System variables for synchronized actions
Operator
ABS()
POT()
TRUNC()
ROUND()
LN()
EXP()
A detailed description of the functions can be found in:
References
Programming Manual, Job Planning; Section "Flexible NC programming" ff.
Indexing
The index of a system variable of type "Array of ..." can in turn be a system variable. The index
is also evaluated in the main run in the interpolator clock cycle.
Example
Program code
... WHEN ... DO $AC_PARAM[$AC_MARKER[1]]=3
Restrictions
● It is not permissible to nest indices with further system variables.
● The index must not be formed via preprocessing variables. The following example is
therefore not permitted since $P_EP is a preprocessing variable:
$AC_PARAM[ 1 ] = $P_EP[ $AC_MARKER[ 0 ] ]
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Meaning
Absolute value
2nd power (square)
Integer component
The accuracy for comparison commands can be set using TRUNC
Round to an integer
Natural logarithm
Exponential function
Function Manual, 08/2018, 6FC5397-5BP40-6BA2
Synchronized actions