Siemens SINUMERIK 840D sl Function Manual page 754

Punching and Nibbling (N4)
Activation and deactivation
Example:
With an IPO cycle of 5 ms, a stroke shall be released two cycles after reaching the
interpolation end:
⇒ MD26018 $MC_NIBBLE_PRE_START_TIME = 0.01 [s]
A pre-initiation time can also be programmed in setting data:
SD42402 $SC_NIBPUNCH_PRE_START_TIME
This setting takes effective only if MD26018 = 0 has been set.
Monitoring of the input signal
If the "stroke active" signal is fluctuating between strokes due to plunger overshoots, for
example, the message "undefined punching signal" can be also be output when interpolation
is stopped.
The message output is dependent on the setting in machine data:
MD26020 $MC_NIBBLE_SIGNAL_CHECK
MD26020 = 0
MD26020 = 1
Minimum period between two strokes
A minimum time interval between two consecutive strokes can be programmed in setting
data:
SD42404 $SC_MINTIME_BETWEEN_STROKES
Example:
There must be a minimum delay of at least 1.3 seconds between two stroke initiations
irrespective of physical distance:
⇒ SD42404 $SC_MINTIME_BETWEEN_STROKES = 1.3 [s]
If a punching dwell time (PDELAYON) is also programmed, then the two times are applied
additively.
If a pre-initiation time at G603 is programmed, it will be effective only if the end of
interpolation is reached before the time set in SD42404:
The programmed time becomes operative immediately. Depending on the size of the block
buffer, strokes that have already been programmed can be executed with this minimum
interval. The following programming measures (example) can be taken to prevent this:
N...
N100 STOPRE
N110 $SC_ MINTIME_BETWEEN_STROKES = 1.3
The function is not active when SD42404 = 0.
754
No alarm
Alarm
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Extended Functions