05.91 4 Programming of Motion Blocks
4.2.7 Exact positioning G09/G60, G00, continuous path operation G62/G64
4.2.7.3 Change from continuous path operation to rapid traverse
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Depending on the machine data, the control
automatically generates “Speed reduction with exact
stop coarse” between a block with G64 and a block
with G00.
Block change with automatic generation of speed reduction with “exact stop coarse”.
t
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V
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G64
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G64
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G00
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G00
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N1
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N1
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N2
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N2
Block change without automatic generation of speed reduction with “exact stop coarse”.
t
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N2
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G64
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G64
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G00
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G00
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N1
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N1
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N2
If, on a transition from continuous-path control to exact stop, the path of the transition block is
shorter than the required deceleration distance, the velocity is abruptly reduced to zero and
alarm 3092 ”Programmed speed too high” is displayed.
Special case: active thread function
When the thread function is active, deceleration must not occur at the end of the block as this
will cause damage to the thread, i.e. the velocity is abruptly reduced to zero after the last
thread block. If another axis is then programmed and the servo enable is already missing,
alarm 168* ”Servo enable trav. axis” is displayed. The exact stop function G09 also acts on a
thread and must therefore be programmed in the last thread block. The command G60 has no
effect with the thread function.
© Siemens AG 1991 All Rights Reserved 6ZB5 410-0HD02 4–29
SINUMERIK 880, (PG)
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