Position-Time Cams - Siemens SINUMERIK 840D sl Function Manual

N3: Software cams, position switching cycles - only 840D sl

9.4 Position-time cams

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.
9.4 Position-time cams
Position-time cams
The term "position-time cam" refers to a pair of software cams that can supply a pulse of a
certain duration at a defined axis position.
Solution
The position is defined by a pair of software cams.
The pulse duration is defined by the lead/delay time of the plus cam.
Machine data can be used to specify that cam pairs with "minus cam position = plus cam
position" should be processed as position-time cams.
Properties of position-time cams
● The pulse duration is independent of the axis velocity and travel direction reversal.
● The pulse duration is independent of changes in the axis position (Preset).
● Activation (rising signal edge) takes place only when the cam position is crossed.
Moving the axis position (e.g. preset) does not trigger activation.
● A lead/delay time is operative for the minus cam and causes a time displacement of the
pulse.
606
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
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
Extended Functions