Real-Time Evaluations And Calculations - Siemens SINUMERIK 840Di sl Function Manual
Synchronized actions, ncu system software
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2.2 Real -time evaluations and calculations
2.2
Real-time evaluations and calculations
Restriction
Calculations carried out in real time represent a subset of those calculations that can be
performed in the NC language. It is restricted to data types REAL, INT, CHAR and BOOL.
Implicit type conversions between REAL, INT, and BOOL in both directions are possible in
synchronized actions. During value assignments and parameter transfers, variables of
different data types can be assigned or transferred.
Scope of application
The term "Real-time expression" refers below to all calculations that can be carried out in the
interpolation cycle. Real-time expressions are used in conditions and in assignments to NC
addresses and variables.
Main run variables
All main-run variables are evaluated (read) in the interpolation cycle and can be written as
part of an action.
The system variables available in synchronized actions during the main run are identified
with a field provided for this purpose in the "List of System Variables" in /LHB/ Manual of
System Variables.
Identification of main-run variables
Real-time variables are all variables that begin with:
$A... ,current main-run variable
$V... , Servo values
$R... , R parameters.
NC–machines– and setting data in the main run are interpreted with
$$M...
$$S...
in synchronized actions.
Note
You can read the machine– and setting data values during the main run, they are addressed
for an online access with $$S... or $$M... and evaluated during the main run, while MD– or
SD–values are read with a $–character at the time the synchronized action is interpreted.
Setting data and machine data from the synchronized action are addressed with the $ sign
and evaluated at the time of preprocessing.
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Function Manual, 11/2006, 6FC5397-5BP10-2BA0
Synchronized actions
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