Absolute rotary encoder P**58
Device configuration
Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
Pepperl+Fuchs Group • Tel.: Germany +49 621 776-0 • USA +1 330 4253555 • Singapore +65 67799091 • Internet http://www.pepperl-fuchs.com
Date of issue 01/15/04
10
3 Device configuration
The rotary encoder with a PROFIBUS interface can be configured and parameters
can be assigned to it according to the needs of the user. For this purpose, the GSD
file associated with the device is loaded into the projecting tool. Various "encoder
classes" as they are known are then available to select during projecting. The
adjustable parameters and functionality of the device depend on the encoder class
that is selected. Rotary encoders support all encoder classes described below, i. e.
functionality is not limited on the hardware side. It is determined by the user alone. In
addition to the encoder classes described in the encoder profile, "Class 1" and
"Class 2", rotary encoders of Pepperl+Fuchs also offer additional encoder classes
with manufacturer specific functions.
Selecting the encoder class determines configuration and parameter data during
projecting. This data that is stored in the PROFIBUS master is transferred to the rotary
encoder once when the system starts up (configuration and parameter assignment
phase "DDLM_Set_Prm"). It is not possible to change the configuration or
parameters while the system is in operation (exception: "Commissioning mode" see
section 5.3).
After the configuration and parameter data is received, the rotary encoder goes into
"normal mode" (cyclic data exchange – "DDLM_Data_Exchange Modus"). In this
mode the position value is transferred, among other things. The length and format of
the exchanged data is also specified during projecting when the encoder class is
selected.
3.1 Principle of data transfer
rotary encoder
GSD file
database
control module
parameter input
parameter ("DDLM_Set_Prm")
once when starting up
projecting software
cyclic data exchange
(for example position value)
specification of device class
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