Endress+Hauser Proline Prowirl 73 - Response of Outputs to Errors

Proline Prowirl 73 Troubleshooting
Endress+Hauser 71
9.5 Response of outputs to errors
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Note!
The failsafe mode of the totalizer, current output, pulse output and frequency output can be
configured by means of various functions in the function matrix.
Positive zero return and error response:
You can use positive zero return to set the signals of the current, pulse and frequency outputs to
their fallback value, for example when operation has to be interrupted while a pipe is being cleaned.
This function has priority over all other device functions; simulations are suppressed, for example.
Response of outputs and totalizers to errors
Process/system error present Positive zero return activated
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Caution!
System or process errors defined as "notice messages" have no effect whatsoever on the outputs. Refer also to the information on ä 38.
Current output MIN. CURRENT
Depends on the option selected in the CURRENT SPAN function. If the current span is:
4 to 20 mA HART NAMUR  output current = 3.6 mA
4 to 20 mA HART US  output current = 3.75 mA
MAX. CURRENT
22.6 mA
HOLD VALUE
Measured value display on the basis of the last saved value preceding occurrence of the
fault.
ACTUAL VALUE
Measured value output is based on the current flow measurement. The fault is ignored.
Output signal corresponds to zero flow.
Pulse output FALLBACK VALUE
Signal output  0 pulse output
HOLD VALUE
Measured value display on the basis of the last valid flow value before the fault occurred.
ACTUAL VALUE
Measured value output is based on the current flow measurement. The fault is ignored.
Output signal corresponds to zero flow.
Frequency output FALLBACK VALUE
0 Hz output.
FAIL LEVEL
Outputs the frequency specified in the FAILSAFE VALUE function.
HOLD VALUE
Measured value output is based on the last measured value saved before the error
occurred.
ACTUAL VALUE
Measured value output is based on the current flow measurement. The fault is ignored.
Output signal corresponds to zero flow.
Status output In the event of a fault or power supply failure:
Status output  not conductive
No effect on the status output.
Totalizer 1 + 2 STOP
The totalizers stop at the last value before the alarm condition occurred.
HOLD VALUE
The totalizers continue to count the flow on the basis of the last valid flow data (before the
fault occurred).
ACTUAL VALUE
The totalizers continue to count the flow on the basis of the current flow data. The fault is
ignored.
The totalizers stop.