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Selection of an acceptable range by plc
• The pressure sensor is to monitor the pressure within a defined win-
dow and give a warning when the pressure is outside this window
(output 1 = OFF as long as the pressure is within the acceptable
range, output 1 switches ON when the pressure leaves the accept-
able range).
• Different operating steps require different windows. They are set by
an analogue signal of the plc (0 ... 5 V).
Wiring diagram:
→
→
example 3, page 26
.
31
ENGLISH
SP1 = 20
rP1 = 18
Basic settings: Without influence by the plc the acceptable
range is between 18 and 20 bar.
InP2 = U
The plc controls the window by a voltage signal.
ILP2 = 0
Minimum value of the control voltage = 0 V; no influence on
basic settings.
IHP2 = 5
Maximum value of the control voltage = 5 V; maximum shift of
the acceptable range.
IEP2 = 1
For maximum control voltage the acceptable range is to be
shifted upwards by 1 bar.
OU1 = Fnc
Window function/normally closed:
OUT1 = OFF when pressure is within the acceptable range;
OUT1 = ON (warning) when pressure leaves the acceptable
range.
IEP2 = 1
0V
5V
Uext
P1[bar]
21
20
18
19
IEP2 = 1
Display: Dmod = P1: system pressure is displayed.
Dmod = P2: the shift value is displayed.
below the line output 1 is switched
above the line output 1 is switched
