Siemens SITRANS P DS III - Failure Behavior; Overview of Failure Behavior; Output; Totalizer Output

Operator control functions via PROFIBUS
7.8 Failure behavior
SITRANS P DS III with PROFIBUS PA
Operating Instructions, 06/2013, A5E00053276-07
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7.8
Failure behavior
7.8.1
Overview of failure behavior
If the transducer block fails, the analog input and totalizer function blocks can adopt a value
preset by the user. If the output variables of the transducer block have the status "Bad" due
to an error, activate the failure behavior for the function blocks. The status "Unsure" then
accompanies the output or the totalizer output.
7.8.2
Output
Set the failure behavior in the analog input function block:
Table 7- 10 Failure behavior of the analog input function block
Failure behavior
Description
Status code
The output value is set to the
replacement value.
The predefined safety preset value is
output.
U_075
Saving of the last valid output value.
The last valid output value is output.
U_071
The incorrectly calculated measured
value is on the output (shutdown logic
turned off).
The bad output value is accompanied by
the status assigned to it by the transducer
block.
B_0xx
To narrow down the cause of failure after the shutdown logic engages, read the measured
value (primary variables) or secondary variables including the status from SIMATIC PDM.
7.8.3
Totalizer output
Set the failure behavior in the totalizer function block:
Table 7- 11 Failure behavior of the totalizer function block
Failure behavior
Description
Status code
Stop Counting is stopped if there are input values with
the "Bad" status.
U_075
Safe operation Counting continues with the last input value that
had the "Good" status prior to the failure.
U_072
Operation The bad measured value is accompanied by the
status assigned to it by the transducer block.
B_0xx