Supplementary Conditions - Siemens SINUMERIK 840D sl Function Manual

● Activation (ON edge) and pulse duration are independent of the travel direction.
● The cam is not deactivated if the cam position is crossed again when the cam is active
(direction reversal).
● The cam time (pulse width) is not interrupted and the cam time not restarted when the cam
position is crossed again.
This behavior is particularly relevant with respect to modulo axes, i.e. if the cam time is
greater than the modulo range crossing time, the cam is not switched in every revolution.
Settings
The following settings must be made to program a position-time cam:
● Position
The position must be defined by a cam pair with which the minus cam position is equal to
the plus cam position.
This is defined using setting data:
SD41500 SW_CAM_MINUS_POS_TAB_1
...
SD41507 SW_CAM_PLUS_POS_TAB_4.
● Pulse duration
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]
● Offset
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]
● Mode
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.
9.5

Supplementary Conditions

Availability of function "Software cams, position switching signals"
The function is an option ("position-switching signals/cam controller"), which must be assigned
to the hardware through the license management.
Extended Functions
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
N3: Software cams, position switching cycles - only 840D sl
9.5 Supplementary Conditions
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