5 Implementation of Modbus TCP
5.10 Diagnostic messages of the modules
98
XI/ON: XNE-GWBR-2ETH-MB
10/2011 MN05002008Z-EN
www.eaton.com
• XN-2AI-THERMO-PI
• XN-4AI-U/I
Table 44:
XN-2AI-
THERMO-PI
Diagnosis byte
Bit
Diagnosis
n (channel n),
n=1,2
0
Measurement value range error:
– Threshold: 1 % of the positive measurement range limit value
– With type K, N and T sensors, the “Underflow” diagnostic
signal is generated on temperatures below -271.6 °C.
1
Wire break (only in temperature measurements)
2 to 7
reserved
Table 45:
XN-4AI-U/I
Diagnosis byte
Bit
Diagnosis
n (channel n),
n=1…4
0
Measurement value range error:
Indication of overvoltage or undervoltage of 1% of the set
voltage range or indication of overcurrent or undercurrent of
1 % of the set current range.
– Voltage -10…+10 V DC:
– Overvoltage: U
max
(U > 10.1 V DC)
– Undervoltage: U
min
(U < -10.1 V DC)
– Voltage 0…+10 V DC:
– Overvoltage: U
max
(U > 10.1 V DC)
– Undervoltage: U
min
(U < 0.1 V DC)
– Current 0…20 mA:
– Overcurrent: I
max
(I > 20.2 mA);
– Undercurrent is not detected.
– Current 4…20 mA:
– Overcurrent: I
max
(I > 20.2 mA);
– Undercurrent: I
min
(I < 3.8 mA)
1
Wire break:
– Indication of a wire break in the signal cable for operating
mode 4…20 mA with a threshold of 3 mA.
2 to 7
reserved