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 131 / 240
Phone +49 721 4846-0, Fax +49 721 4846-1019, Email
Global variables:
Global variables can be used inside and outside of macros.
The maximum number of global variables is 10.
Global variables are created and modified using ADD, CPY or VAR. They can be
deleted with VAR.
The variable values can be queried with VAR?.
Adjustment Procedures
ID-Chip Support / Stage Replacement
The stage which is connected to the E-727 may contain an ID-chip. The following data is stored in
the ID-chip (and cannot be modified there by the customer):
Stage type
Serial number of the stage
Calibration data
Servo-control data (dynamic tuning, load dependent)
The parameters which are usually stored in ID-chips are marked in the table in "Parameter
Overview" (p. 189), but the list can differ slightly among the different mechanics provided by PI.
When a stage with ID-chip is connected to the E-727 for the first time, the stage parameters from
the ID-chip will be written to nonvolatile and volatile memory upon power-on or reboot of the E-
727. Afterwards, the complete set of ID-chip parameters will be overwritten on power-on or
reboot only if the "Power Up Read ID-Chip" option is enabled. By default, this option is disabled to
facilitate maintaining optimized parameter settings in the E-727.
INFORMATION
When you connect a stage when the controller is powered on, the ID-chip of the stage is not read
by the controller. To read the ID-chip data, the controller must be power-cycled or rebooted using
the RBT command or the corresponding host software functions.
A stage can be easily exchanged due to the functionality of the ID-chip.
Consider the following when replacing stages with ID-chips.
"Simple" Replacement
Normally, when you replace a stage with a new unit and you are using standard factory settings for
all parameters, you do not have to adjust anything. The ID-chip holds all information needed. At
power-on of the system, the firmware reads the stage type and serial number stored in the ID-chip
and compares this data to the data from the last connected stage, stored in the E-727:
If there is a new stage type connected to the E-727, all the data in the ID-chip will be
read and the corresponding parameters in the E-727 overwritten.
If there is a stage of the same type but with a different serial number connected to
the E-727, the calibration data from the ID-chip will be read and only the