User manual

5
Technical Information
Message Mapping
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: controller doesn’t respond (RS485 link broken)
Bit 1: controller not identified (not compatible with the
Profibus Interface)
Bit 2: first loop of requests not ended (values in the input
data are not fully coherent yet)
Bit 4,5,6,7: number of controller detected on the low speed
(Rs485) line
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.
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