Response Of Outputs To Errors - Endress+Hauser Proline Promass 83 Operating Instructions Manual

Proline Promass 83 MODBUS RS485
!
Failsafe mode of outputs and totalizers
Process/system error is present
"
Caution!
System or process errors defined as "Notice messages" have no effect whatsoever on the outputs. See the information on Page 39 ff.
Current output MIN. CURRENT
The current output will be set to the lower value of the signal on alarm level depending on
the setting selected in the CURRENT SPAN (see the "Description of Device Functions"
manual).
MAX. CURRENT
The current output will be set to the higher value of the signal on alarm level depending on
the setting selected in the CURRENT SPAN (see the "Description of Device Functions"
manual).
HOLD VALUE
Measured value display on the basis of the last saved value preceding occurrence of the
fault.
ACTUAL VALUE
Measured value display on the basis of the current flow measurement. The fault is ignored.
Pulse output FALLBACK VALUE
Signal output → no pulses
HOLD VALUE
Last valid value (preceding occurrence of the fault) is output.
ACTUAL VALUE
Fault is ignored, i.e. normal measured-value output on the basis of ongoing flow
measurement.
Frequency output FALLBACK VALUE
Signal output → 0 Hz
FAILSAFE VALUE
Output of the frequency specified in the FAILSAFE VALUE function.
HOLD VALUE
Last valid value (preceding occurrence of the fault) is output.
ACTUAL VALUE
Fault is ignored, i.e. normal measured-value output on the basis of ongoing flow
measurement.
Totalizer STOP
The totalizers are paused until the error is rectified.
ACTUAL VALUE
The fault is ignored. The totalizer continues to count in accordance with the current flow
value.
HOLD VALUE
The totalizers continue to count the flow in accordance with the last valid flow value
(before the error occurred).
MODBUS RS485 In the event of faults, the value "NaN" (not a number) is transmitted instead of the current
measured value.
Endress+Hauser
9.5

Response of outputs to errors

Note!
The failsafe mode of totalizers, current, pulse and frequency outputs can be customized by means
of various functions in the function matrix. You will find detailed information on these procedures
in the "Description of Device Functions" manual.
You can use positive zero return to reset the signals of the current, pulse and frequency outputs to
their fallback value, or reset measured value transmission via the fieldbus to '0'. This is used, for
example, when measuring has to be interrupted while a pipe is being cleaned. This function takes
priority over all other device functions. Simulations, for example, are suppressed.
Troubleshooting
Positive zero return is activated
Output signal corresponds to "zero flow"
Output signal corresponds to "zero flow"
Output signal corresponds to "zero flow"
Totalizer stops
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