8-12
Drive Functions
MPH-02, MPB-02, MPD-02
DOK-INDRV*-MP*-02VRS**-FK01-EN-P
As motor encoder or external encoder can be realized as distance-coded
measuring system and the position data reference can be established for
both encoders, there are separate parameters for the respective absolute
offset available:
•
S-0-0177, Absolute offset 1
(motor encoder)
•
S-0-0178, Absolute offset 2
(external encoder)
Note:
Only one distance-coded measuring system can be
connected!
After starting
C0600 Drive controlled homing procedure command
(S-0-0148) the drive for searching the dedicated point moves the axis
according to the reference travel direction set in
S-0-0147, Homing
parameter
. When the controller has detected the position of the
dedicated point by evaluating the reference mark signals and, if
necessary, the home switch signal of the encoder selected in S-0-0147,
the position data reference between actual position values and axis can
be established.
When the home switch signals that the axis is at the end of the travel
range (home switch activated) and the C0600 command is started in this
initial position, the controller controls the drive in such a way that the
dedicated point is found without the axis exceeding the travel range limit.
For detailed information on the procedure of drive-controlled homing see
section "Functional Sequence "Drive-Controlled Homing Procedure""
For information on the actual position value after establishing the position
data reference for motor encoder and external encoder see section
"General Information on Establishing the Position Data Reference" in the
same chapter
Information on the Home Switch
A home switch possibly required has to be connected to the assigned
digital input of the control section of the controller. Observe the allowed
signal levels! The signal status of the home switch is displayed in
parameter S
-0-0400, Home switch
.
See "Digital Inputs/Outputs" in chapter "Extended Drive Functions"
In the initial status, the evaluation of the home switch signal is activated
by the default setting of the respective bit of
S-0-0147, Homing
parameter
. If there isn’t any home switch required (see fig.
"Recommendation for using a home switch") the evaluation has to be
deactivated!
In the case of encoders
without
distance-coded reference marks, it is
necessary to determine at which edge reversal of the home switch
activation the drive is to react. Status and edge reversal of the home
switch signal are monitored by the controller.
Searching the Dedicated Point,
Basic Procedure
Connecting the Home Switch
Activating the Home Switch
Evaluation
Detecting the End of the Travel
Range for Encoders Without
Distance-Coded Reference
Marks
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of
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