Detailed description
2.4 Referencing with incremental measurement systems
Basic logic functions: Reference Point Approach (R1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
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Figure 2-7
Electronic reference cam offset
Reference cam adjustment
Encoder with equidistant zero marks
Always ensure that the reference cam of encoders that supply zero marks at equidistances
is accurately adjusted so that the correct zero mark is always detected during reference point
approach.
Dynamic response
The following factors influence the dynamic response from the arrival of the reference cam to
the machine up to the detection of reference cam signals transferred from the PLC user
program to the NC:
•
Switching accuracy of the reference cam switch
•
Delay of the reference cam switch (NC contact)
•
Delay at the PLC input
•
PLC cycle time
•
Cycle time for updating the VDI interface
•
Interpolation cycle
•
Position control cycle
Setting notes
•
reference cam
Aligning the signal edge of the reference cam directly between two zero marks has
proven to be the most practical method.
•
Electronic reference cam offset
Information needed for parameterizing the electronic reference cam offset is to be found
in the read-only machine data:
MD34093 $MA_REFP_CAM_MARKER_DIST (distance between reference cam/reference
mark)
Summary of Contents for SINUMERIK 840D sl
Page 282: ...Index Basic logic functions Acceleration B2 64 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 388: ...Basic logic functions Travel to fixed stop F1 Function Manual 11 2006 6FC5397 0BP10 2BA0 52 ...
Page 962: ...Index Basic logic functions Emergency Stop N2 20 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 1704: ...Constraints Basic logic functions Spindles S1 94 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 1716: ...Index Basic logic functions Spindles S1 106 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 1996: ...Index Basic logic functions Tool Offset W1 208 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 2150: ...Table of contents Basic logic functions Appendix 4 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 2184: ...Glossary Basic logic functions Appendix 38 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...