Response Of Outputs To Errors - Endress+Hauser MODBUS RS485 Operating Instructions Manual

Proline Promag 53 MODBUS RS485
!
Failsafe mode of outputs and totalizers
System/process error is present
"
Caution!
System or process errors defined as "Notice messages" have no effect whatsoever on the inputs and outputs. See the information on → ä 60
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.
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.
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 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.
Troubleshooting
Positive zero return is activated
Output signal corresponds to "zero flow"
Output signal corresponds to "zero flow"
Output signal corresponds to "zero flow"
105