Promag 53 PROFIBUS DP/PA Troubleshooting
Endress+Hauser 145
9.5 Failsafe mode of outputs
!
Note!
The failsafe mode of the 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 fieldbus to "0", 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
System/process error is present Positive zero return is activated
"
Caution!
System or process errors defined as "Notice messages" have no effect whatsoever on the inputs and outputs. See the information on → 73
Current output MINIMUM VALUE
0–20 mA 0 mA
4–20 mA 2 mA
4–20 mA NAMUR 3.5 mA
4–20 mA US 3.75 mA
0–20 mA (25 mA) 0 mA
4–20 mA (25 mA) 2 mA
MAXIMUM VALUE
0–20 mA 22 mA
4–20 mA 22 mA
4–20 mA NAMUR 22.6 mA
4–20 mA US 22.6 mA
0–20 mA (25 mA) 25 mA
4–20 mA (25 mA) 25 mA
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"
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 LEVEL
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"
Relay output In the event of a fault or power supply failure: Relay deenergized
The "Description of Device Functions" manual contains detailed information on relay
switching response for various configurations such as error message, flow direction,
EPD, limit value, etc.
No effect on relay output
PROFIBUS → 132 -
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