Siemens SINUMERIK 840D sl Function Manual page 858

W4: Grinding-specific tool offset and tool monitoring
18.2 Online tool offset
Syntax
FCTDEF(<Func>,<LLimit>,<ULimit>,<a0>,<a1>,<a2>,<a3>)
Meaning
FCTDEF(...):
<Func>:
<LLimit>:
<ULimit>:
<a0>,<a1>,<a2>,<a3>:
Example
Definitions
● Function number: 1
● Lower and upper limit value: -100, 100
● Gradient of the characteristic: a
● The operating point should be located at the center of the characteristic. Based on the
setpoint position of axis XA in the WCS at the instant that the function is defined in the NC
program, the characteristic must be shifted in the negative Y direction: a
* $AA_IW
● a
858
= a = 0
2 3
Defining a polynomial function for PUTFTOCF(...):
y = f(x) = a + a *x + a *x
2
0 1 2
Function number
Data type: INT
Range of values: 1, 2, 3
Lower limit value
Data type: REAL
Upper limit value
Data type: REAL
Coefficients of polynomial function
Data type: REAL
= 1
1
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
+ a *x
3
3
= -a
0
Extended Functions
* XA = -1
1 D