Detailed description
2.4 Referencing with incremental measurement systems
Basic logic functions: Reference Point Approach (R1)
24
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
2.4.5
Buffered actual value
Automatic referencing
By buffering the actual value, "automatic referencing" is enabled, which does not require
machine axes with incremental measuring systems, after situations in which they are in the
"Not referenced" condition, to traverse back to the reference point for referencing of the
measuring system. For example, this is the case after:
•
POWER OFF/ON
•
"Parking" selected:
DB31, ... DBX1.5 / 1.6 (Position measuring system 1/2) = 0
DB31, ... DBX2.1 (servo enable) = 0
If the function is active, referencing is performed without axis motion by synchronizing the
actual value system of the machine axis to the last valid actual value. The actual value is
buffered in a retentive memory area of the control even after POWER OFF.
Warning
During the time in which the measuring system (encoder) of the machine axis is switched off
((POWER OFF, "Parking" the axis, etc.), the machine axis may not be further mechanically
moved. This must be supported by the machine manufacturer with such measures as
holding brakes, etc., and ensured by the user. Otherwise the actual value system of the
machine axis will no longer be synchronized resulting in danger to personnel and machine.
Precondition for automatic referencing
At the time of automatic referencing (e.g. after POWER ON, "Parking" of the machine axis is
again deselected, etc.), the encoder status of the active measuring system of the machine
axis must have the value 2.
MD34210 $MA_ENC_REFP_STATE = 2
That is, the encoder is referenced, an exact stop is reached, and automatic referencing is
active the next time the encoder is activated.
The following conditions must be fulfilled:
•
"Automatic referencing" is assigned for the measuring system (encoder):
MD34210 $MA_ENC_REFP_STATE = 1
Encoder status =
1:
Automatic referencing enabled, but encoder not yet referenced or
exact stop not reached.
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 ...