Siemens SINUMERIK 840D sl Function Manual page 734

Software Cams, Position Switching Signals (N3)
Position-time cams
Settings
The following settings must be made to program a position-time cam:
● Position
● Pulse duration
● Offset
● Mode
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The position must be defined by a cam pair with which the minus cam position is equal to
the plus cam position.
This is specified by setting data:
SD41500 SW_CAM_MINUS_POS_TAB_1
to
SD41507 SW_CAM_PLUS_POS_TAB_4.
The pulse duration is calculated by adding together the associated entries for the cam
pair in:
MD10461 SW_CAM_PLUS_LEAD_TIME[n]
SD41521 SW_CAM_PLUS_TIME_TAB_1[n]...
SD41527 SW_CAM_PLUS_TIME_TAB_4[n]
The time displacement of the position-time cam is calculated by adding together the
associated entries for the cam pair in:
MD10460 SW_CAM_MINUS_LEAD_TIME[n]
SD41520 SW_CAM_MINUS_TIME_TAB_1[n]...
SD41526 SW_CAM_MINUS_TIME_TAB_4[n]
MD10485 SW_CAM_MODE
Bit 2 = 1 must be set in the machine data to ensure that all cam pairs with the same
values for minus cam and plus cam positions are treated as position-time cams.
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Extended Functions