Siemens SITRANS F FM100 - Page 28

SITRANS FM100
A5E48762204-AA page 27
The different output types are optimized for different types of applications. The
following table contains the application recommendations for the different output
types. If the outputs are not used according to the recommendations,
measurement deviations can occur and the desired functionality is not achieved.
Application
Output type
Analog
output (all
variants)
Frequency
output
Pulse
output
Alarm
output
Telemetry device


Limit monitoring

Window monitoring

External dosage

External volumetric count

Application table output types
10.6.1 Alarm output
The alarm outputs can be parameterized with a limit value function or a window
function.
10.6.1.1 Function
The parameter "Function" defines the basic function. Limit value function and
window function are available.
Limit value function: The switching output is active if the current flow rate value is
above the switching threshold. It remains active until the measured value has
fallen below the switching threshold minus the hysteresis.
Window function: The switching output is active if the current flow measured
value is outside a window, which is formed by the "switching threshold" and the
"lower threshold". The monitored window decreases in each case by the amount
of the "hysteresis". If the switching output is to be active within the window, the
parameter "switching function" must be changed from N/O to N/C.