Siemens SINUMERIK 828D Function Manual page 44

Detailed description
2.3 System variables for synchronized actions
Example: Linear dependency
Figure 2-2
Parameter
<Poly_No>
<Lo_Limit>
<Up_Limit>
:
a
0
:
a
1
:
a
2
:
a
3
Program code
FCTDEF(1, -100, 100, 500, -100, 0, 0)
; Or in abbreviated notation without parameters a2 and a3
FCTDEF(1, -100, 100, 500, -100)
44
Example of linear dependency
Meaning
: Number of the polynomial, e.g. = 1
: Lower limit of the function values = -100
: Upper limit of the function values = 100
Axis section on the ordinate (feedrate):
(5 - 4) / 100 = 5 / a
a = 100 * 5 / (5 - 4) = 500
0
Gradient of the straight line:
= 100 / (4 - 5) = -100
a
1
= 0 (no square component)
= 0 (no cubic component)
0
Function Manual, 07/2012, 6FC5397-5BP40-3BA0
Synchronized actions