Absolute rotary encoder P**58
Appendix
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
42
9.2 Troubleshooting
Problem
If one of the following PROFIBUS masters is used, problems occur when the system
starts up if encoder classes higher than Class 1 are used (bus malfunction, encoder
does not report):
• SIEMENS S5-95U
• Master connection SIEMENS IM 308-B
• Softing PROFIboard
• Allen Bradley 1785 PFB/B
• Mitsubishi A1SJ 71PB92D
Possible cause
Masters do not support the full number of diagnostic bytes (57 bytes) made available
by absolute encoders in some circumstances.
Solution
If this is a possibility, the maximum amount of diagnostic data per slave should be
increased in the master.
If this is not a possibility, the absolute encoder can either be used as a Class1 device
(16 diagnostic bytes), or one of the manufacturer specific P+F classes can be
selected (P+F 2.1 or 2.2), in which case "Reduced diagnostics" should be turned on
in parameter assignment (see section 5.1.5).
Problem:
For COM PROFIBUS version 5.0, the P+F absolute encoder cannot be projected
together with the S5-95U.
Cause
The S5-95U does not support the full amount of diagnostic data (57 bytes).
For the COM PROFIBUS version 5.0, the GSD entry "Max_Diag_Data_Len=57" is
checked and projecting together with the S5-95U is prevented.
Solution
Use COM PROFIBUS version 3.3, select one of the manufacturer specific P+F
classes (P+F 2.1 or 2.2), and activate reduced diagnostics (parameter).
Use with COM Profibus Version 5.0 is only possible with a modified GSD file (the
slave key "Max_Diag_Data_Len" must be changed).
For COM PROFIBUS version 5.0, the P+F absolute encoder cannot be projected
together with the S5-95U.
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