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Festo — SFAB-...-PNLK — 2022-08
Product overview
4.2.3.2
Colour change
A red colour change can be set in the display for the switching outputs OutA and OutB dependent on
the switching status. The colour change enables the system status to be identified from a distance.
The red display is always dominant.
Parameter
Meaning
‘bLUE’
The display is always blue; the colour change function is switched off.
‘R.On’
The display is red when the switching output is set (high = 1).
The display is blue when the switching output is not set (low = 0).
‘R.OFF’
The display is red when the switching output is not set (low = 0).
The display is blue when the switching output is set (high = 1).
Tab. 7: Change in colour of display
4.2.3.3
Volume measurement and mass measurement
A threshold value for the volume or the mass is set in the accumulated volume measurement or
mass measurement. If the configured threshold value is reached, the SFAB outputs a switching pulse
at the switching output OutC. The volume measurement or mass measurement is restarted at every
switching pulse. The pulse width is adjustable.
Setting of N/O contact (NO)
Setting N/C contact (NC)
Tab. 8: Volume pulse with accumulated volume measurement
4.2.4
Filter
The filter smoothes the flow rate measurement signal in 12 stages. Smoothing affects all outputs. The
switching times of the flow-related switching outputs and the rise time and fall time of the analogue
output change. The filter time equals the time constant Т of a low-pass filter.
flow rate
measuring signal
signal filter
[Filt]
display-filter
[AVER]
flow rate display value
switching output
analogue output
switching signal (IO-Link)
analogue signal (IO-Link)
volume / mass
measurement
Fig. 4: Effect of filter settings
