Siemens SINUMERIK 840C - Manual (Page 328)

09.01 6 NC Machine Data (NC MD), NC Setting Data (NC SD)
6.6.3 Channel-specific MD bits 1 (channel bits)
7 6 5 4 3 2 1 0
Bit No.
NC MD
558*
Autom.
refresh
when
changing
the param.
block of a
mode group
axis (from
SW 6.1)
Supplement
axis after
block
search
Default value: 0
Bit 0 Bit 0 = 1 The "3D interpolation" option must be programmed. Following the block
search with calculation, not only the axes programmed in the destination
block are traversed, but also as many as 5 additional axes, as long as
these axes were previously programmed.
If more than 5 axes were programmed, the first 5 must be traversed in
REPOS mode. Tool offset, current D no. or zero offset must not be
modified prior to NC START.
Bit 0 = 0 Following the block search with calculation, only the axes programmed
in the destination block are traversed. It is thus possible to modify the
TO and the ZO prior to NC START.
Active: In the next block
Bit 3 Bit 3=1 If the parameter set "Position control" is switched over for an axis of
the mode group, a "Refresh" is carried out with the next block change
with exact stop (i.e. not with G62/G64 enabled). The parameter set-
dependent data for velocity, acceleration and jerk are therefore effective
in the pre-calculated blocks. This function should only be used if there
are axes in a channel that use the parameter block change for velocity,
acceleration or jerk.
Bit 3=0 If the parameter set "Position control" is switched over, the new
machine data values for velocity, acceleration and jerk are only effective
with time delay (after the pre-calculated blocks have been processed).
In order to avoid this, a @714 must be programmed in the part program
or a NC Stop/NC Start must be preset for the current channel.
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50 6–143
SINUMERIK 840C (IA)