Siemens SITRANS FUS1020, Manual, Page: 154 / 251

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1020NFM-1D Section 6
6.5.3 MEMORY/FAULT SET
Certain situations (e.g., an empty pipe or excessive aeration) will interrupt data production. Use Memory/
Fault Set to select the meter response to such an interruption. The Fault setting (default) will zero the
flow rate output and declare an alarm on a flow display screen, Datalogger report and an assigned
relay output.
For some applications, occasional temporary Fault conditions may be a normal part of the process
and would not require an alarm response. The system offers a Memory operating mode to support
such an application. Memory Mode suspends the system’s Fault response by preventing the flow
outputs from dropping to zero for the interval specified in the [Memory Delay] menu cell. During the
Memory duration, the meter will maintain the last valid flow reading measured before the onset of the
fault condition. The default Memory Delay is 60 seconds. You may select any duration from 3 to 604,800
seconds (one week).
To select Memory Mode:
To access the [Memory/Fault Set] option list press the <Right Arrow>.
Move the cursor down to [Memory] by pressing the <Down Arrow>.
To make selection press <ENTER>.
This moves the highlight to [Memory Delay <sec>].
Memory Delay <s>
Selecting [Memory] activates the suppressed [Memory Delay] menu cell. It allows you to specify the
number of seconds that the meter maintains its last valid flow reading. When the memory delay ex-
pires, it triggers the fault alarm response described previously.
To specify the Memory Delay:
To enable numeric entry press the <Right Arrow>.
Use PC numeric keys or KeyPad to enter the delay in seconds.
To register the new value press <ENTER>.
6.6 THE FLOW/TOTAL UNITS MENU
The Flow/Total Units menu is available after selecting a meter type and measurement channel. Use
the Flow/Total Units menu to select energy and volumetric flow units and an associated time base for
the energy and flow rate and total outputs. After making your selections, a view-only menu cell shows
the resultant scaling. Another menu cell lets you adjust the output resolution by selecting a display
range.
This system provides three totalizer display modes:
POSFLOW ............................ Positive (forward) energy/flow total only
NEGFLOW ............................ Negative (reverse) energy/flow total only
NETFLOW ............................ The net of the Positive and Negative energy/flow (default)