5 Implementation of Modbus TCP
5.10 Diagnostic messages of the modules
XI/ON: XNE-GWBR-2ETH-MB
10/2011 MN05002008Z-EN
www.eaton.com
99
• XNE-8AI-U/I-4PT/NI
Table 46:
XNE-8AI-U/I-
4AI-PT/NI
Diagnosis byte
Bit
Diagnosis
A
The switching
thresholds de-
pend on the set-
ting of the
module parame-
ter operation
mode Kx,
see manual
MN05002011Z
n (channel n),
n=1…8
0
Measurement value range error “Out of Range” (OoR)
A
:
– The measured value overstepps or undercuts the limit of the
nominal range (limit values according to parameterization).
1
Wire break (WB)
A
:
– The measured value is in the range which is assumed that
there is a wire break in the signal cable.
– In temeperature messurements
– In resistance measurements
– In current measurements in the range of 4…20 mA
2 Short-circuit
(SC):
– The measured value is in the range which is assumed that
there is a short-circuit.
– In temeperature messurements:
Threshold: 5
Ω
(loop resistance)
– 3-wire measurements with PT100 sensors cannot differen-
tiate between a short-circuit and a wire break at tempera-
tures below -177 °C. In this case, the diagnostic "shortcir-
cuit" is generated.
3
Overflow / Underflow (OUFL):
– The measured value exceeds the measurement range (limit
values according to parameterization). The module cannot
measure this value. The return value is the maximum or
minimum value which can be measured.
4 to 6
reserved
7
Hardware error (HW Error):
– Exampels: CRC error, calibration errors…
– The return value of the measured value is “0”.