LOGO! Manual
A5E00380835-01
190
Calculation rule
If the On threshold Off threshold, then:
Q = 1, if:
(actual value Ax – actual value Ay) > On
Q = 0, if:
(actual value Ax – actual value Ay) Off.
If the On threshold < Off threshold, then Q = 1, if:
On (actual value Ax – actual value Ay) < Off.
Preset of the Par parameter
The gain and offset parameters are used to adapt the sen-
sors to the relevant application.
View in programming mode:
B3 1+
On =+00000
Off =+00000
Parameter protection mode
On threshold
Off threshold
Press
Decimals in the message text
B3 2
A =00.00
B =+00000
p=0
Offset
Gain
Example
In a heating control system, the supply T
v
and return line
temperatures T
r
are to be compared, for example with a
sensor at AI2.
A control signal is to be triggered (for example ”heater
On”), when the difference between the supply and return
line temperatures is greater than 15 . The control signal is
reset when the difference is less than 5 C.
The process variable of the temperature is to be shown in
parameter assignment mode.
LOGO! functions
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