Siemens SIMATIC ET 200AL System Manual page 496

Parameters/address space
4.3 Explanation of the parameters
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.
Diagnostics: Underflow channel n
Enabling of the diagnostics when the measured value falls below the underrange.
Diagnostics: Overflow channel n
Enabling of the diagnostics when the measured value exceeds the overrange.
Diagnostics: Overflow/Underflow (for PROFIBUS only)
Enabling of the diagnostics when the measured value exceeds the overrange or falls below
the underrange.
The diagnostic enable has an effect on all channels.
26
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 value Explanation
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
Analog input module AI 4xU/I/RTD 4xM12 (6ES7144-5KD00-0BA0)
Process data Diagnostics
alarm per
channel
0x7FFF Wire break
0x7FFF -
0x7FFF High limit ex-
ceeded
0x7FFF High limit un-
dershot
0x7FFF -
Manual, 03/2016, A5E32350124-AC