BEI Sensors PHU9 Absolute Hollow Shaft Encoder - Manual (Page 35)

PROFIBUS USER MANUAL
Preliminary 35
BEI IDEACOD SAS
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Mail :
[email protected]
Web : www.bei-ideacod.com
8 Technical Data
See Datasheets.
9 Appendix
9.1 FAQ absolute encoder Profibus
Problem
There are problems with the profibus network
(bus error, no answer from the encoder) if one
of the following profibus masters is used:
- SIEMENS S5-95U
- Master Interface SIEMENS IM 308-B
- Softing PROFIboard
- Allen Bradley 1785 PFB/B
- Mitsubishi A1SJ 71PB92D
Possible cause
The masters do not support the full diagnostic
data length (57 bytes).
Solution
If it is possible the maximum number of
diagnostic data per slave should be increased
in the master.
If this is not possible the encoder can either be
used as a „class 1“ encoder (diagnostic data
length 16 bytes) or one of the manufacturer-
specific versions (BEI IDEACOD 2.1 or 2.2) can
be used with reduced diagnostics (cp. 5.1.5).
Problem
If COM PROFIBUS Version 5.0 is used it is not
possible to insert the POSI+ encoder into the
hardware configuration if the PLC S5-95U is
used.
Cause
The S5-95U does not support the full diagnostic
data length (57 bytes). COM PROFIBUS V5.0
checks
the GSD-parameter
„Max_Diag_Data_Len=57“ and prevents the
configuration of both devices together.
Solution
Use COM PROFIBUS Version 3.3, choose one of
the manufacturer-specific BEI IDEACOD-
versions (BEI IDEACOD 2.1 or 2.2) and activate
the reduced diagnostics.
If COM PROFIBUS V5.0 is to be used the
configuration of the BEI IDEACOD encoder is
only possible with a modified GSD file (slave
key „Max_Diag_Data_Len“ has to be
changed).
Problem
PLC and master are switched on, bus is active,
but there is no answer from the encoder.
Possible solutions
First of all the state of LEDs should be checked
(cp. section 6.3). Possibly this can give hints to
the cause of the problem.
Both LEDs dark: Check power supply!
Both LEDs bright:
Encoder is ready but receives no configuration
or parameter telegrams. Check the address