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Advanced Diagnostics
Appendix
DC Power Supply
Figure 8.1
An undetected unbalance can cause communication issues and a lack of electromagnetic
compatibility stability.
Note
A single pole-to-shield fault is not critical. But if a second pole-to-shield-fault happens at the
same time, corruption of the communication signal and high crosstalk levels can occur
between the 2 affected segments.
8.1.5
Active Field Devices
The number and addresses of the currently active field devices are analyzed. Any difference to
the time of commissioning is evaluated and reported.
8.1.6
Communication Error Statistics
Parameters for segment and field-device-specific error counters, e.g., CRC errors, framing
errors, the number of FF-H1 tokens the device missed. etc.
The number of missed H1 tokens is only updated if the DTM is opened and the segment is
selected.
8.1.7
History Recording
Segment and field-device-specific physical layer values are stored with a timestamp of up to 2
years in the advanced diagnostic module for trend analyses.
8.1.8
Jitter
Definition
Jitter is the deviation from the ideal timing of an event. In this case, it is the deviation from the
ideal zero crossing point of the transmitted signal curve during the nominal bit duration, mea-
sured in relation to the previous zero crossing (reference event).
Signal
Fault wiring DC unbalance
145
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