Siemens SITRANS FUS060 Operating Instructions Manual page 54

Functions
7.4 Device outputs (menu 4)
Depending on the selected function (menu 4.2.1) either the pulse value and pulse width (menus
4.2.3 and 4.2.4) or the full scale frequency (menu 4.2.5) settings will affect the output.
The digital output 1 can indicate flow (impulse or frequency) and some alarms/limits.
Function (menu 4.2.1)
Figure 7-1 Function block diagram
In the "Pulse" and "Frequency" functions the flow is converted into a binary signal at the digital
output:
In the "Pulse" function a pulse sequence corresponding with the forward net flow is issued. Each
pulse corresponds to a net flow according to the set Pulse value (menu 4.2.3). The maximum
number of pulses per time unit is reached with a flow to the extent of the upper value on the
flow measuring scale (menu 3.1.2). Higher flow values can no longer be taken correctly into
consideration at the pulse output. No pulses are issued when flow = 0.
In the "Frequency" function a constant signal with a frequency proportional to the current flow
value (output value) is issued. The frequency 0 corresponds to the lower value, the set upper
frequency to the upper value of the output scale (menu 4.2.5). Flow values below the lower
value are issued with the frequency 0.
If the flow exceeds the upper value on the measuring scale, the digital output can no longer
correctly issue the required number of pulses or the frequency and a pulse/frequency error
message ("P/F too high") will appear.
If the pulse/frequency error message appears, it is required to adjust the pulse settings (menus
4.2.3 and 4.2.4) or the full scale frequency (menu 4.2.5).
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SITRANS FUS060 with HART
Operating Instructions, 09/2021, A5E01204521-AL