Supplements to ET 200SP documentation
2.5 I/O module manuals
Product information on the documentation of the ET 200SP distributed I/O system
Product Information, 02/2021, A5E03799595-BG
61
Explanations of the cases:
The "wire break" diagnostics is reported. This has a high-
er priority than the "Underflow" diagnostics.*
The "Reference channel error" diagnostics is reported if
this is enabled. Where own pending diagnostic infor-
mation ("overflow" or "underflow") is reported as out-
going. Wire break diagnostics is detected independently
of the measured value and has the same priority as the
"Reference channel error" diagnostics. Both items of diag-
nostic information can be pending simultaneously. The
measured value of the reference channel (RTD channel) is
adopted for the TC channel. The validity of the measured
value of the TC channel is irrelevant.
No diagnostics reported. A wire break check is carried
out (i.e. test current flows).*
Behavior corresponds to case 1.
(Measured values are in the valid measuring range)
The "wire break" diagnostics is reported.*
(Measured values are in the valid measuring range)
No diagnostics reported. A wire break check is carried out
(i.e. test current flows).*
(Measured values are in the valid measuring range)
No "wire break" diagnostics is reported. No wire break
check is carried out (i.e. no test current flows). This is
required to calibrate thermocouples, since the test current
necessary for a wire break check leads to measurement
errors during calibration.*
* Channel with wire break
2.5.3 Communications module manuals
Communications module CM DP, Edition 12/2014
The communications module CM DP supports the PROFIsafe protocol V2.
Exception: Fail-safe modules that only support PROFIsafe V1 mode.
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