User Manual
E727T0005, valid for E-727
BRO, 2019-06-28
Physik Instrumente (PI) GmbH & Co. KG, Auf der Roemerstrasse 1, 76228 Karlsruhe, Germany Page 65 / 240
Phone +49 721 4846-0, Fax +49 721 4846-1019, Email info@pi.ws, www.pi.ws
Starting AutoZero via EtherCAT Master
E-727 models with EtherCAT interface (p. 164): The AutoZero procedure is the only homing
method supported by the E-727. For details, see “Homing Mode” (p. 173).
In order for the EtherCAT master to be able to initiate a transition to the Ready to switch on state,
the AutoZero procedure must be finished.
Special Function: Sensor Autoscaling
Sensor autoscaling can be included in the AutoZero procedure, if necessary.
INFORMATION
With the default settings of the relevant parameters, sensor autoscaling is excluded from the
AutoZero procedure:
Sensor Autoscaling Enable (ID 0x03003700): default value is 0
Sensor Autoscaling Gain (ID 0x03003701): default value is 1.0
Change the values of the parameters only if sensor autoscaling is necessary. Sensor
autoscaling is necessary only if all of the following conditions are met:
− The stage has no ID chip.
− The stage has piezoresistive or strain gauge sensors.
− PI has informed you that the stage design is suitable for sensor autoscaling (currently, this
can apply to customized stages only).
Objective of sensor autoscaling:
Ensure the replaceability of stage(s) and controller:
For optimum sensor scaling, the sensor gain setting of the controller has to be
adapted to the connected stage.
Prerequisites:
If autoscaling of a sensor is to be included in the AutoZero procedure: The Sensor
Autoscaling Enable parameter (ID 0x03003700) must be set to the value 1 for that
sensor.
Sensor autoscaling setting changed by AutoZero:
If the Sensor Autoscaling Enable parameter (ID 0x03003700) has the value 1, the AutoZero
procedure changes the Sensor Autoscaling Gain (ID 0x03003701) for the corresponding sensor
channel (in addition to the settings mentioned on p. 63).
Data Recording
How to Use the Data Recorder
The E-727 includes a real-time data recorder. It is able to record several input and output signals
(e.g. current position, sensor input, output voltage) from different data sources (e.g. controller
axes, input and output channels, digital inputs and outputs). The gathered data is stored
(temporarily) in "data recorder tables"—each table contains the signal from one data source. You
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