Siemens Sinumerik 840D sl Programming Manual page 304

Path action
12.2 Continuous-path mode (G64, G641, G642, G643, G644, G645, ADIS, ADISPOS)
● Rounding is not parameterized.
This occurs when:
– For G641 in G0 blocks ADISPOS = 0 (default!)
– For G641 in non-G0 blocks ADIS = 0 (default!)
– For G641 on transition from G0 and non-G0 or non-G0 and G0 respectively, the smaller
– For G642/G643, all axis-specific tolerances are zero.
● The block does not contain traversing motion (zero block).
This occurs when:
– Synchronized actions are active.
– Zero blocks are generated by program jumps.
Continuous-path mode in rapid traverse G0
One of the specified functions G60/G9 or G64, or G641 - G645, also has to be specified for
rapid traverse motion. Otherwise, the default in the machine data is used.
References
For further information about the continuous-path mode see:
Function Manual, Basic Functions; Continuous-Path Mode, Exact Stop, LookAhead (B1).
304
value from ADISPOS and ADIS applies.
Normally, the Interpreter eliminates zero blocks. However, if synchronous actions are
active, this zero block is included and also executed. In so doing, an exact stop is initiated
corresponding to the active programming. This allows the synchronous action to also
switch.
Programming Manual, 01/2015, 6FC5398-1BP40-5BA2
Fundamentals