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MPH-02, MPB-02, MPD-02
Distance Monitoring of
Reference Mark Signals
Reference Mark Distance of
Linear Encoders
DOK-INDRV*-MP*-02VRS**-FK01-EN-P
optimum distance =
0.5 x distance of
reference marks
distance of
reference marks
actual home switch signal
effective home switch signal
reference travel direction
Fig. 8-15:
Operating principle of parameter S-0-0299
The position distance of the reference mark signals is monitored during
the homing procedure. The position distance to be expected for motor
encoder or external encoder is determined by the controller depending on
the type of encoder used and the value of P-0-0153, Optimum distance
home switch-reference mark. This allows detecting whether
• the parameter values for reference mark evaluation were correctly set
- or -
• the reference mark signals are correctly input.
Note:
Parameter P-0-0153 refers to the encoder to be homed
according to the setting in S-0-0147, Homing parameter. If a
second encoder has to be homed that requires different values
in P-0-0153, the parameter P-0-0153 has to be adjusted to the
respective encoder by the control master before the C0600
command is started!
Motion Range for Homing Encoders with Distance-Coded
Reference Marks
For the homing procedure, relative measuring systems with distance-
coded reference marks require a motion range corresponding to the
distance of two neighboring reference marks.
The distances of neighboring reference marks of encoders with distance-
coded reference marks are calculated according to the formula below:
motor
encoder
:
external
encoder
S-0-0165: value of S-0-0165, Distance-coded reference offset A
S-0-0116: value of S-0-0116, Feedback 1 Resolution
S-0-0117: value of S-0-0117, Feedback 2 Resolution
s
:
distance of neighboring reference marks
RefMarks
Fig. 8-16:
Distance of neighboring reference marks of linear encoders with
distance-coded reference marks
Drive Functions
S-0-0299, Home switch offset
=
s
S
-
0
-
0165
RefMarks
=
:
s
S
-
0
-
0165
RefMarks
8-17
DF0078v1.fh7
S
-
0
-
0116
*
*
S
-
0
-
0117
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