Diagnostic interrupt
8.3 Channel dependent diagnostic interrupts
SM331; AI 8x12 Bit Getting Started part 1: 4 -20mA
8-4 Getting Started, 11/2006, A5E00253410-02
8.3 Channel dependent diagnostic interrupts
8.3.1 There are five channel dependent diagnostic interrupts
There are five channel dependent diagnostic interrupts:
● Configuration / programming error
● Common mode error
● Wire break
● Underflow
● Overflow
Note
Here we show you only the channel specific diagnostics for the measuring modes 2 or 4-
wire current transducers. Other measuring modes are similar but not described here.
8.3.2 Configuration / programming error
Meaning
The position of the measuring range modules does not match the measuring mode set in the
hardware configuration.
8.3.3 Common mode error
Meaning
The voltage difference U
cm
between the inputs (M-) and the common voltage potential of the
measuring circuit (M
ana
) is too high.
In our example, this error cannot occur because M
ana
is connected to M for a 2-wire
transducer (fixed potential).
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