Predefined Functions - Siemens SINUMERIK 840Di sl Programming Manual

Tables
12.4 List of predefined subprograms
SYNFCT INT: Number of
polynomial
function
defined with
FCTDEF.
FTOC INT: Number of
polynomial
function defined
with FCTDEF
*) Only special system variables are permissible as result variables. These are described in
the Programming Guide Advanced in the section on "Write main run variable".
**) Only special system variables are permissible as input variables. These variables are
described in the Programming Guide Advanced in the list of system variables.
12.4.3

Predefined functions

Predefined functions
Predefined functions are invoked by means of a function call. Function calls return a value.
They can be included as an operand in an expression.
1. Coordinate system
Keyword/ Result
function
identifier
CTRANS FRAME
CROT FRAME
510
VAR REAL: VAR REAL:
Reference input variable**)
variable*)
VAR REAL: INT: Length 1,
input variable**) 2, 3
INT: Channel
number
INT: Spindle
number
1st parameter 2nd parameter
AXIS REAL: Offset
AXIS REAL:
Rotation
If the condition in the motion synchronous action is
fulfilled, the polynomial determined by the first
expression is evaluated at the input variable. The
upper and lower range of the value is limited and
the input variable is assigned.
Modify tool fine compensation according to a
function defined with FCTDEF (polynomial no
higher than 3rd degree).
The number used here must be specified in
FCTDEF.
3. - 15. 4. - 16.
Parameter Parameter
as 1 ... as 2 ...
3./5. 4./6.
Parameter Parameter
as 1 ... as 2 ...
Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
Explanation
Translation: Zero offset
for multiple axes.
One axis identifier is
programmed at a time,
with its respective value
in the next parameter.
CTRANS can be used to
program offset for up to
8 axes.
Rotation: Rotation of the
current coordinate
system.
Maximum number of
parameters: 6 (one axis
identifier and one value
per geometry axis)
Fundamentals