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6 Programming the control
6.9
Axes and spindles
6.9.6
Parameter settings for absolute measuring systems
(EnDat interface)
Requirement
Table 6-18
Axis machine data for absolute value encoders
MD
1005: ENC_RESOL_MOTOR
1007: ENC_RESOL_DIRECT
1011: ACTUAL_VALUE_CONFIG
1030: ACTUAL_VALUE_CON-
FIG_DIRECT
34200: ENC_REEP_MODE [n]:
0...max. No. of encoders –1
34220: ENC_ABS_TURNS_MO-
DULO [n]:
0...max. No. of encoders –1
*)
Measuring system parameters were set automatically when the motor was selected.
Setting up the
absolute encoder
Readjustment
6-92
TO adapt the absolute encoder to the machine conditions, follow the procedure
described for a rotary or linear incremental encoder.
The following additional axis machine data must be observed for absolute value
encoders:
Rotary absolute value encoders
at the motor
Marks/rev
(standard motor 2048)
–
*)
Bit 3
–
0
Multiturn resolution
(Standard motor 4096)
To set the encoder, determine the offset between the machine zero and the zero
of the absolute encoder and save it to the SRAM of the NC module.
The adjusted state is identified by MD 34210: ENC_REFP_STATE = 2.
Reference material:
/FB1/ R1, Functional description of the basic machine,
Reference point approach
When the machine is started up, the absolute encoder must be set up once the
axes are ready to move. However, it may also be necessary to readjust the en-
coder at a later point in time, e.g.
S
after dismantling/installing the encoder or the motor with absolute encoder
or,
S
in general if the mechanical connection between the encoder and load was
separated and, when it was joined together again, the remaining deviation is
outside the tolerances
S
if data is lost from the SRAM of the NCK, battery power lost, PRESET
S
if gearbox is switched between the load and absolute encoder
MD 34210: ENC_REFP_STATE deleted
SINUMERIK 840D/810D Start-Up Guide (IADC) – 03/2006 Edition
at the machine
–
*)
Marks/rev
–
Bit 3
0
Multiturn resolution
© Siemens AG 2006 All Rights Reserved
03/2006
Linear absolute value
encoders
at the machine
–
Graduation in [nm]
–
Bit 3 + Bit 4
0
–
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