Detailed Description
2.1 Various interface signals and functions (A2)
Basic logic functions: NC/PLC interface signals (Z1)
34
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
DB31, ...
DBX1.5 - DBX1.6
Position measuring system 1 (PMS1) / Position measuring system 2 (PMS2)
Application
example(s)
Changing over from position measuring system 1 to positioning measuring system 2 (and vice
versa).
If the axis in both position measuring systems was referenced and the limit frequency of the
measured value encoder has not been exceeded in the meantime (i.e.
DB31, ... DBX60.4 and 60.5 (referenced/synchronized 1 and 2) has signal state 1,
then after the changeover, a reference point approach does not have to be repeated.
On switchover, the current difference between position measuring system 1 and 2 is traversed
immediately.
With the machine data:
MD36500 $MA_ENC_CHANGE_TOL (maximum tolerance on position actual value
changeover)
a tolerance bandwidth can be entered - the deviation between the two actual values may lie
within this bandwidth when changing over.
If the actual value difference is greater than the tolerance, a switchover between the two
systems does not take place and alarm 25100 "Measuring system switchover" not possible is
triggered.
Parking axis (i.e. no PMS is active):
If the encoder has to be removed - e.g. if a rotary table has to be removed from the machine -
the position measuring system monitoring is switched off in the parking position.
The mounted axis/spindle encoder turns so quickly in certain applications that it can no longer
maintain its electrical characteristics (edge rate-of-rise, etc.).
Switch-off measuring system:
When measuring system 1 or 2 is switched off the associated interface signal:
DB31, ... DBX60.4/60.5 (referenced/synchronized 1/2)
is reset.
Reference point approach:
Reference point approach of the axis is executed with the selected position measuring system.
Every PMS must be separately referenced.
Special cases,
errors, ....
If the state "parking axis" is active, the interface signal:
DB31, ... DBX60.4/60.5 (referenced/synchronized 1/2)
is ignored at NC start for this axis.
Corresponding to .... DB31, ... DBX60.4 (referenced / synchronized 1)
DB31, ... DBX60.5 (referenced / synchronized 2)
DB31, ... DBX61.6 (speed controller active)
DB31, ... DBX2.1 (controller enable)
MD36500 $MA_ENC_CHANGE_TOL (Max. tolerance on position actual value switchover)
MD30200 $MA_NUM_ENCS (number of encoders)
Additional references /FB1/ Functions Manual Basic Functions; Speeds, Set-Actual Value System, Control (G2)
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 ...