Detailed description
2.8 Referencing in followup mode
Basic logic functions: Reference Point Approach (R1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
51
Unique zero mark
Referencing of an incremental measuring system is based on the explicit position of the
encoder zero mark relative to the overall traversing range of the machine axis.
Because the reference cam signal is not evaluated by the NC during referencing in follow-up
mode, unique identification of the reference point when referencing in follow-up mode will
only result with:
•
Only one encoder zero mark in the traversing range of the machine axis
•
Linear measuring systems with distancecoded reference marks
•
Modulo rotary axes (absolute position within one revolution)
Zero mark selection when several zero marker signals occur
If several encoder zero marks are detected in the traversing range of the machine axis due
to machine-specific factors, e.g., reduction gear between encoder and load, a BERO must
be mounted on the machine and connected to the relevant drive module (SIMODRIVE 611D)
via a BERO input in order to uniquely specify the reference point. The position of the
reference point is then derived from the combination of BERO signal and encoder zero mark.
Zero mark evaluation with BERO must be parameterized as the referencing mode:
MD34200 $MA_ENC_REFP_MODE = 5
Negative edge evaluation
In the case of a referencing operation with a negative edge evaluation of the BERO signal:
MD34120 $MA_REFP_BERO_LOW_ACTIVE = FALSE
synchronization is with the next encoder zero mark encountered after the BERO is exited.
Positive edge evaluation
In the case of a referencing operation with a positive edge evaluation of the BERO signal:
MD34120 $MA_REFP_BERO_LOW_ACTIVE = TRUE
synchronization is with the next encoder zero mark encountered after the BERO is
approached.
Mechanically, the BERO must be sized in such a way that the positive BERO signal covers
the entire width of the encoder zero mark.
Enable
The "Referencing in follow-up mode" function is enabled with:
MD34104 $MA_REFP_PERMITTED_IN_FOLLOWUP = TRUE
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 ...