9 Trouble-shooting PROline Promag 50
94 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.
Positive zero return and failsafe mode:
You can use positive zero return to set the signals of the current, pulse and frequency
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 current 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 Page 64 ff.
Current output MINIMUM 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).
MAXIMUM 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 measure-
ment.
Output signal corresponds to
“zero flow”
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