Independent, Timer-Controlled Output Of Cam Signals - Siemens SINUMERIK 840D Function Manual

Further settings
The following bit must be set to "0" if the behavior described here is to be activated:
MD10485 SW_CAM_MODE bit 0 = 0
13.3.5

Independent, timer-controlled output of cam signals

Independent, timer-controlled cam output
Each switching edge is output separately per interrupt due to the timer-controlled, independent
(of interpolator clock cycle) cam output.
The mutual influence of the cam signals is no longer applicable as a result of:
● single output per interpolator clock cycle
● output time determined by highest priority cam pair (lowest cam pair number)
A total of 8 timer-controlled cam outputs per interpolator clock cycle can be configured for
setting/resetting the 4 onboard outputs. The signal states of the plus and minus cams are also
made available as standard on the PLC interface for the timer-controlled variant. However,
these signals are not relevant or are correspondingly inaccurate with a timer-controlled output.
Signal generation
Previously, it had to be specified in which way the signals to be logically combined should be
generated. This is realized using bit 1 in machine data:
MD10485 SW_CAM_MODE (behavior of the software cams)
Bit
1
Settings
Cam pairs are assigned to onboard outputs using machine data:
MD10480 SW_CAM_TIMER_FASTOUT_MASK (screen form for the output of cam signals via
timer interrupts on the NCU)
In addition, this type of processing must be explicitly selected:
MD10485 SW_CAM_MODE bit 0 = 1
Note
This function operates independently of the HW assignment selected in MD10470 ... MD10473.
The onboard byte may not be used a multiple number of times.
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
Value Signal generation
0 Inversion of the signal behavior of the plus cam when:
plus cam - minus cam ≥ 180 degrees
1 No inversion of the signal behavior of the plus cam when:
plus cam - minus cam ≥ 180 degrees
N3: Software cams, position switching signals
13.3 Output of cam signals
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