Siemens SINUMERIK 840C - Manual (Page 257)

6 NC Machine Data (NC MD), NC Setting Data (NC SD) 10.94
6.5 Spindle-specific MD (spindle data)
Spindle position for external M19 452*
Default value Lower input limit Upper input limit Units
0 +0 35 999 0.01°
Active on
NC Stop
If M19 is started by the PLC via the "Position spindle" and "PLC spindle control" signals, the
NC positions the spindle to the angle specified in NC MD 452*.
Mode group 453*
Default value Lower input limit Upper input limit Units
1 +1
+1, 2
6 (as from SW 4)
–
Active on
Power On 1)
NC MD 453* defines the mode group to which the spindle is to belong.
Mode groups without spindles are permitted.
Note:
Spindles generally only react to the mode group RESET assigned to this MD. The spindle
does not stop when a program is aborted with channel reset.
u: Pulses variable increment weighting 2) 455*
Default value Lower input limit Upper input limit Units
32 0
65 000
9999 9999 (as from SW 2)
–
Active on
Power On
v: Traversing path variable increment weighting 2) 456*
Default value Lower input limit Upper input limit Units
5 625 0
65 000
9999 9999 (as from SW 2)
–
Active on
Power On
The internal calculations for the spindle are made in the resolution provided by the measuring
system (measuring system resolution). In order to be able to carry out the internal conversions
to the measuring system resolution, the latter must be entered in MD 456*. As for axes, input
is not made via the encoder graduation and pulse multiplication but via variable increment
weighting. This makes it possible to use spindle encoders with an arbitrary number of pulses
and measuring gear.
Note: as from SW 4
MD 2420* 2421* and 2422* in the MDD are used to automatically calculate MD 455* and 456*.
_______
1) Spindles can be allocated to another mode group via the warm restart function without having to execute a
hardware reset (for a detailed description of the warm restart function, see Section entitled ”Functional
Descriptions”).
2) MD 455* and 456* are invalid and are not evaluated, if the same measuring system is used for the spindle
and C axis. MD 364* and 368* are valid instead.
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SINUMERIK 840C (IA)