Siemens SINUMERIK 840C - Manual (Page 407)

6 NC Machine Data (NC MD), NC Setting Data (NC SD) 12.93
6.12.1 NC setting data (NC SD)
M version:
If the control is initialized for milling, the actual value coupling between the spindle speed
actual value and feed setpoint is direction dependent. If the traversing direction of the feed
axis is to be altered, then the spindle direction of rotation (M3-->M4) must also be altered.
Additionally, the overflow when the spindle is reversed (e.g. (M3-->M4) must be taken into
account when programming the thread depth.
Note:
If in thread tapping blocks on milling machines, after the first thread block the direction of
movement but not the spindle direction of rotation is programmed in the opposite direction,
traversing is still carried out in the previous direction. The software limits switches are active.
When the software limit switches are triggered, the following error must be eliminated. The
software limit switch is therefore exceeded by the following error.
T version:
If the control is initialized for turning, the actual value coupling between the spindle speed
actual value and the feed setpoint is not direction dependent. This means that the spindle
can continue turning in one direction while the feed axis is reprogrammed to change direction.
With G34/G35 the thread lead is altered per turn by the value programmed under address F
until the maximum or minimum possible value is obtained.
The value F must be used without a sign and is derived from the known initial and final lead
and thread length:
F= F=
Initial lead Initial lead
2 2
– – final lead final lead
2 2
2 · thread length 2 · thread length
PLC alarm text file 1) 5
Default value Lower input limit Upper input limit Units
1 1 9 999 –
Active on
–
When NC machine data bit 5199.4 is set, the display of the PCF files is enabled.
NC MD 5199.4 = 0 No display of PCF files
NC MD 5144.1 = 1 Display of PCF files active
The setting of NC setting data 5 (PLC alarm text files) in the setting data area "General data",
defines which PCF file is to be used to display PLC alarm texts. The value range is 0 - 9999.
_______
1) Up to SW 2
2) As from SW 3
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SINUMERIK 840C (IA)