Siemens FST020, Function Manual, Page: 71 / 194

Setup
3.4 Inputs and outputs
FST020 Function manual
Function Manual, 09/2017, A5E42949526-AA
69
Measured mass flow value = 7.5 kg/s (constant)
Result:
● Frequency = 4.5 kHz
Note
The connected equipment must be capable of registering the full range of frequencies
configured.
Status output
The status output can be used to show alarm status and it can be signaled on Status output
or Relay output.
Note
Flow direction warning
The limit function for the current output can be used to signal the flow direction by setting the
Lower warning limit for the Process value to 0. A warning will occur in case of negative flow.
This warning can be output on the status output if Status mode is set to Alarm item and the
Process alarms (1) [relevant process value] below warning limit is selected.
3.4.1 Alarm status
Depending on the Status mode setting, multiple alarms can be signaled on the output and
selected from the alarm class or the alarm item lists.
● Alarm class: Alarm will be signaled if alarm within the selected alarm class occurs.
● Alarm item: Alarm will be signaled if selected alarm item occurs. It is possible to select
multiple alarms to be signaled.
Note
Alarm class / NAMUR status signals
The options depend on the setting selected in Status icons, either NAMUR status signals
or Alarm class (Siemens Standard).