Siemens SINUMERIK 840D sl Function Manual page 711

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, 09/2009, 6FC5397-1BP20-0BA0
N3: Software cams, position switching cycles - only 840D sl
9.3 Output of cam signals
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