Siemens ET 200pro Operating Instructions Manual page 429

Diagnostics of short-circuit (inputs)
If this parameter is enabled, the system generates short-circuit diagnostic data when a short-
circuit between signal lines is detected.
Diagnostics of short-circuit (outputs)
If this parameter is enabled, the system generates diagnostic data when a short-circuit
between the output line and P potential or ground is detected.
Wire break diagnostics
If this parameter is enabled, the system generates wire break diagnostic data when a wire
break is detected.
Analog input modules: Observe the rules outlined below in case of a wire break in the 1 V to
5 V and 4 mA to 20 mA measuring ranges:
Parameters
Wire break diagnostics
enabled
Wire break diagnostics
disabled
Overflow/underflow
enabled
Wire break diagnostics
disabled
Overflow/underflow
disabled
Measured value limits for wire break and measuring range undershoot detection:
1
•
•
Overflow/underflow diagnostics
If this parameter is enabled,
● the overflow diagnostics is generated when the measured value reaches the overflow
● the underflow diagnostics is generated when the measured value reaches the underflow
ET 200pro distributed I/O system
Operating Instructions, 03/2013, A5E00335544-08
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
range.
range.
15.8 Overview of parameters of the analog electronic modules
Measured
value
7FFF
H
8000
H
8000
H
Analog electronic modules
Explanation
Wire break diagnostics
Measured value after leaving the
undershoot range
Diagnostics message Value below high
limit/low limit
Measured value after leaving the
undershoot range
429