Siemens Logo! Manual page 198

LOGO! functions
Calculation rule
S
If the On threshold
Q = 1, if:
(actual value Ax – actual value Ay) > On
Q = 0, if:
(actual value Ax – actual value Ay)
S
If the On threshold < Off threshold, then Q = 1, if:
On
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
On =+00000
Off =+00000
Press
B3
A
B
p
Example
In a heating control system, the supply T
temperatures T
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.
190

(actual value Ax – actual value Ay) < Off.

1+
2
=00.00
=+00000
=0
are to be compared, for example with a
r
Off threshold, then:

Parameter protection mode
On threshold
Off threshold
Gain
Offset
Decimals in the message text
v
Off.
and return line
LOGO! Manual
A5E00380835-01