IFM Electronic efector500 PF20 Notice Utilisateurs page 30

Hysteresis function:
The hysteresis keeps the switch-
ing state of the output stable if
the system pressure varies about
the preset value. With the system
pressure rising,
switches when the switch-on
point has been reached (SPx).
With the system pressure falling
the output does not switch back
until the switch-off point (rPx)
has been reached.
The hysteresis can be adjusted: First the switch-on point is set, then
the switch-off point with the requested distance.
Window function
The window function enables
the monitoring of a defined
acceptable range. When the sys-
tem pressure varies between the
switch-on point (SPx) and the
switch-off point (rPx), the output
is switched (window function /
NO) or not switched (window
function / NC).
The width of the window can be
set by means of the difference
between SPx and rPx. SPx = upper value, rPx = lower value.
Scaling the measuring range (analogue output)
• With the parameter "Analogue start point" (ASP) the measured value
at which the output signal is 4mA or 0V is defined.
• With the parameter "Analogue end point" (AEP) the measured value
at which the output signal is 20mA or 10V is defined.
• Minimum distance between ASP and AEP = 25 % of the final value
of the measuring range (scaling factor 4).
the output
P
SP
rP
1
0
1
0
acceptable range
P
SP
rP
1
0
1
0
hysteresis
t
Hno
Hnc
t
Fno
Fnc
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