Response Of Outputs To Errors - Endress+Hauser PROline prosonic flow 90 Operating Instructions Manual

9 Trouble-shooting
!
80
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; Sim-
ulations, for example, are suppressed.
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 inputs and out-
puts. See the information on Page 44 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.
Pulse output FALLBACK VALUE
Signal output
HOLD VALUE
Last valid value (preceding occurrence of the
fault) is output.
ACTUAL VALUE
Fault is ignored, i.e. standard measured value
output on the basis of ongoing flow measure-
ment.
o
no pulses
PROline Prosonic Flow 90
Positive zero return is activated
Output signal corresponds to
"zero flow"
Output signal corresponds to
"zero flow"
Endress+Hauser