H D 2 - D M - A / D M - A M
Measured Values / Parameters
Subject to reasonable modifications due to technical advances.
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Figure 9.3: Fault wiring DC unbalance
An undetected DC unbalance may cause communication problems as
well as a lack of EMC stability. In the worst case an undetected DC un-
balance may harm the communication.
Communication Errors Statistic
Segment and field device specific error counters for example CRC er-
rors, framing errors etc.
Field Device Polarity
Detects the polarity of the communication signal for every field device.
A single pole-to-shield fault is not absolutely critical, but if a second pole-
to-shield-fault happens at the same time, corruption of the communica-
tion signal and high crosstalk levels can occur between the two affected
segments.
P
o
w
er C
onditioner
P
o
w
er C
onditioner
Signal
DC Power Supply
