Hysteresis function (fig. 1):
The hysteresis keeps the switching state of the output stable if the system
pressure varies about the preset value. With the system pressure rising, the
output switches when the switch-on point has been reached (SP1). With the
system pressure falling the output does not switch back until the switch-off
point (rP1) 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 (fig. 2):
The window function enables the monitoring of a defined acceptable range.
When the system pressure varies between the switch-on point (SP1) and the
switch-off point (rP1), 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 SP1
and rP1. SP1 = upper value, rP1 = lower value.
Scaling the measuring range (analogue output)
Scaling can also be set by means of the teaching process or by enter-
ing a value for the
ASP
and
AEP
parameters.
• By means of the
OU2
parameter you define whether the set
measuring range is provided as a 4 ... 20 mA signal (OU2 = I), a
20 ... 4 mA signal (OU2 = InEG), a 0 ... 10 V signal (OU2 = U) or a
10 ... 0 V signal (OU2 = UnEG).
• By teaching the analogue start point (
tASP
) or setting the parame-
ter
ASP
you define the measured value at which the output signal
is 4 mA / 0 V (20 mA / 10 V at InEG / UnEG).
31
ENGLISH
t
P
SP
rP
1
0
1
0
t
P
SP
rP
1
0
1
0
Hno
hysteresis
Hnc
Fno
acceptable range
Fnc
1
2
