Siemens SIMATIC ET 200AL Manual page 28

Diagnostics: Wire break channel n
Enabling of the diagnostics if the analog input module has no current flow or the current is
too weak for measurement at the correspondingly configured input.
Note
Wire break diagnostics
A wire break diagnostics is not possible for all measuring ranges and measurement types for
analog input channels.
The table below shows the rules you must observe in the case of a wire break in the
measuring ranges 1 to 5, 4 to 20 mA:
Table 4- 4
Parameter
Wire break enabled
Wire break disabled
Underflow enabled
Wire break disabled
Underflow disabled
Measuring range limits for detection of wire break and measuring range undershoot:
1
•
•
The table below shows the diagnostics that can occur for wire break with the measurement
type RTD/R.
Table 4- 5
Diagnostics:
Wire break
activated
Deactivated
Deactivated
Deactivated
Deactivated
* This column does not apply to the measurement type resistance.
Analog input module AI 4xU/I/RTD 4xM12 (6ES7144-5KD00-0BA0)
Manual, 08/2018, A5E32350124-AD
Parameters for wire break
Event
Wire break
1
Wire break
1
Wire break
1
1 V to 5 V: at 0.296 V
4 mA to 20 mA: at 1.185 mA
Diagnostics with RTD/R
Diagnostics:
Overflow
Deactivated
Deactivated
Activated
Activated
Deactivated
Measured Explanation
value
7FFF Wire break diagnostics
H
8000 Measured value after leaving the under-
H
range
Diagnostics alarm Low limit violated
8000 Measured value after leaving the under-
H
range
Diagnostics: Event
Underflow*
Deactivated Wire break
Activated Wire break
Deactivated Wire break
Activated Wire break
Deactivated Wire break
Parameters/address space
4.3 Explanation of the parameters
Process data Diagnostics
alarm per
channel
0x7FFF Wire break
0x7FFF -
0x7FFF High limit ex-
ceeded
0x7FFF High limit un-
dershot
0x7FFF -
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