PI E-871.1A1N, User Manual, Page: 22 / 226

Component Description
Parameters Parameters reflect the properties of the positioner connected (e.g.,
travel range) and specify the behavior of the E-871.1A1N (e.g., set-
tings for the servo algorithm).
The parameters can be divided into the following categories:
■
Protected parameters whose default settings cannot be
changed
■ Parameters that must be set by the user to adapt to the applica-
tion
In the case of positioners with ID chip, the values of some parame-
ters are stored on the ID chip. They are loaded to the volatile
memory when switching on or rebooting the E-871.1A1N.
Write permission for the parameters is determined at command
level. The current command level can be queried with the
CCL?
command and changed with the
CCL
command. This may require
entering a password.
The list of parameters available in the E-871.1A1N can be queried
with the
HPA? command.
For more information on parameters, see: Adapting Set-
tings (p. 104)
ASCII commands
(GCS) Communication with the E-871.1A1N can be made with com-
mands from the PI General Command Set (GCS). The GCS syntax
version can be queried with the
CSV?
command.
Examples of the use of GCS:
■
Configuring the E-871.1A1N
■ Setting the operating mode
■
Starting motion of the positioner
■
Getting system and position values
The list of commands available in the E-871.1A1N can be queried
with the
HLP?
command.
Servo algorithm Closed-loop operation: The position error that results from the dif-
ference between the commanded target position and the actual
position (sensor feedback) runs through a servo algorithm.
For information, see:
Servo Algorithm and Other Control Value
Corrections (p. 35)
Data recorder The E-871.1A1N contains a real-time data recorder. The data re-
corder can record various signals (e. g., position, control value)
from different data sources (e. g., logical axes).
For information, see:
Data Recorder (p. 74)
Macros The E-871.1A1N can save macros. Command sequences can be
defined and stored permanently in the nonvolatile memory of the
device via the macro function. A startup macro can be defined that
runs each time the E-871.1A1N is switched on or rebooted. The
startup macro simplifies stand-alone operation (operation without
a connection to the PC).
For information, see:
Controller Macros (p. 93)
Commands
4 PRODUCT DESCRIPTION PZ285EN
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