Trouble-shooting Proline Promass 83 PROFIBUS DP/PA
136 Endress+Hauser
9.5 Response of outputs to errors
!
Note!
The failsafe mode of totalizers, current, pulse and frequency outputs can be customised 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 set the signals of the current, pulse and status outputs to their
fallback value, 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.
Failsafe mode of outputs and totalizers
Process/system error is present Positive zero return is activated
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Caution!
System or process errors defined as “Notice messages” have no effect whatsoever on the inputs and outputs. See the information on Page 47 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.
Output signal corresponds to “zero flow”
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.
Output signal corresponds to “zero flow”
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.
Output signal corresponds to “zero flow”
PROFIBUS → Page 121 –
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