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

9.3.5

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 interpolation cycle) cam output.
Interaction between cam signals due to:
● single output per interpolation cycle
● output time determined by highest priority cam pair (lowest cam pair number)
does not take place.
A total of eight timer-controlled cam outputs per interpolation cycle can be configured for
setting/resetting the four 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, but
they are not relevant or accurate with a timer-controlled output.
Signal generation
MD10485 SW_CAM_MODE Bit 1
The above machine data must be set beforehand to specify
how the signals to be gated are to be generated:
Bit
Not set
set
Settings
The assignment of cam pairs to onboard outputs
is controlled by machine data:
MD10480 SW_CAM_TIMER_FASTOUT_MASK
(screen form for output of cam signals via timer interrupts to NCU).
In addition, the general machine data below must be set to explicitly select the mode of
operation:
MD10485 SW_CAM_MODE Bit0=1
Note
This function runs independently of the assignment in machine data:
MD10470 SW_CAM_ASSIGN_FASTOUT_1 or
MD10471 SW_CAM_ASSIGN_FASTOUT_2 or
MD10472 SW_CAM_ASSIGN_FASTOUT_3 or
MD10473 SW_CAM_ASSIGN_FASTOUT_4.
The onboard byte may not be used more than once at any one time.
Extended Functions
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Software cams, position switching signals (N3)
Signal generation
Inversion of signal response of plus cam when:
plus cam - minus cam ≥ 180 degrees
No inversion of signal response of plus cam:
plus cam - minus cam ≥ 180 degrees
9.3 Output of cam signals
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