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Technical Information
Diagnosis Management
In addition to the Profibus six byte standard diagnostic, the interface provides both
user diagnostic and static diagnostics functions.
Standard diagnostic
The standard diagnostic management is fully compliant with the Profibus
specification.
User diagnostic
The first byte in the user diagnostic area reflects the controller serial link status with
following meaning:
Bit 0:
Bit 2:
So, if the low nibble in the first byte is equal to 0, the interface is working properly.
Otherwise there is a problem.
During the start-up phase after one interface power on or controller power on, the
first byte can assume values different from zero for few seconds
Each nibble (4 bits) in the bytes following the interface status byte, represents the
status of the last attempt to write a parameter with following coding (diag status byte):
1
Write success
2
Protocol error (checksum error on low speed network)
3
Invalid channel
4
Invalid data
5
Invalid channel
6
Range error
7
Format error
8
Write not allowed while HV ON
9
Write not allowed while HV OFF
10 Write allowed only in serial mode
The Profibus external diagnosis services are used to report following unexpected
situations:
Agilent 4UHV Ion Pump Controller User Manual
controller doesn't respond
first loop of requests not ended (values in the input data are not
fully coherent yet)
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