Siemens SINUMERIK 828D Function Manual page 1213

Figure 15-7 Synchronization with rising reference cam signal edge
Electronic reference cam offset
Electronic reference cam offset is used for compensating reference cam length increases caused by
temperature:
MD34092 $MA_ REFP_CAM_SHIFT (electronic reference cam offset for incremental measuring systems with
equidistant zero marks)
After a rising or falling reference cam edge is detected the axis is synchronized for the next encoder zero mark
only after the cyclically calculated offset path has been covered.
Because the offset path s
paths s and s
shift_min shift_max
s = MD34092 $MA_ REFP_CAM_SHIFT
shift_min
s = MD34092 $MA_ REFP_CAM_SHIFT +
shift_max
MD34040 $MA_REFP_VELO_SEARCH_MARKER * interpolation cycle
The reference cam offset acts in the direction of zero mark search.
Prerequisite
The reference cam offset is only active for machine axes for which a reference cam has been parameterized:
MD34000 $MA_REFP_CAM_IS_ACTIVE = 1
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
is calculated by the NC in IPO cycles, the following minimum and maximum offset
shift
will result:
15.5 Referencing with incremental measurement systems
R1: Reference point approach
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