Basic logic functions: Reference Point Approach (R1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
55
Supplementary conditions
3
3.1
Large traverse range
Notes on uniqueness of encoder position
Linear absolute encoder
The absolute value of linear position encoders, e.g., Heidenhain LC181, is always unique for
the scale lengths available.
Rotary absolute encoder
The absolute value of rotary absolute encoders is only unique within the range of the specific
maximum encoder revolutions.
For example, the EQN 1325 rotary absolute encoder by Heidenhain supplies a unique
absolute value in the range of 0 to 4,096 encoder revolutions.
Depending on how the encoder is connected that will result in:
•
Rotary axis with encoder on load: 4096 load revolutions
•
Rotary axis with encoder on motor: 4096 motor revolutions
•
Linear axis with encoder on motor: 4096 motor revolutions
Example:
An EQN 1325 rotary absolute encoder is connected to the motor of a linear axis. For an
effective leadscrew pitch of 10 mm this will result in a unique absolute value within the travel
range -20.48 to +20.48 m.
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 ...