N3: Software cams, position switching cycles - only 840D sl
8.4 Position-time cams
Extended Functions
Function Manual, 03/2013, 6FC5397-1BP40-3BA1
551
Signal generation
Previously, it had to be specified in which way the signals to be logically combined should be
generated. This is realized using bit 1 in machine data:
MD10485 SW_CAM_MODE (behavior of the software cams)
Bit Value Signal generation
0 Inversion of the signal behavior of the plus cam when:
plus cam - minus cam ≥ 180 degrees
1
1 No inversion of the signal behavior of the plus cam when:
plus cam - minus cam ≥ 180 degrees
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.
8.4 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.
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