04.97
Programming of Traversing Blocks
4.11.10 Acceleration override G30 to G39
By means of the acceleration override, the acceleration and deceleration behaviour of the
positioning processes can be influenced. The acceleration override is useful if transport
devices are sometimes operated with load and sometimes, without load. Under load, they are
operated with reduced acceleration/deceleration value. The acceleration/deceleration values
are fixed by the machine data MD27 and MD28. By means of G30 to G39, a reduction in
percent of the two values can be obtained in the traversing block. These functions are self-
holding.
G-function 2
30 100%
acceleration/deceleration override
31 10%
acceleration/deceleration override
:
:
39 90%
acceleration/deceleration override
a a a a a a
a a a a a a
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a a a a a a
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a a a a a a
a a a a a a
a a a a a a
Programming:
N5 G90 G77 X10.000 FX4000.00
N10 G35 X20.000
N15 X30.000
N20 G32 X40.000
N25 G32 X50.000
N30 G30 X60.000
Program sequence:
N10
➀
➁
➂
➃
➄
N25
t
N30
N20
N15
N5
100%
20%
20%
50%
50%
100%
v
➀
Between N5 and N10, no flying block change takes place, as acceleration and brake
ramps change. The axis brakes until the PEH exact stop window is reached and then
accelerates with the new acceleration value.
➁
A flying block change from N10 to N15 takes place, as the acceleration override does not
change.
➂
The change of the acceleration override prevents the flying block change.
➃
A flying block change takes place, as the acceleration override does not change.
➄
The change of the acceleration override prevents the flying block change.
The acceleration override is also deselected by:
•
Operating-mode change
•
Reset of the axis by the control signal [RST]
©
Siemens AG 1997 All Rights Reserved 6ZB5 440-0VU02
4 – 39
WF 723 C (Programming Guide)
