Siemens LOGO! 24RC Manual page 173

Components used
K1
K2
S0 (NC contact)
S1 (NO contact)
S2 (NO contact)
S3 (NO contact)
H1
H2
Block diagram of the LOGO! solution
The block diagram of the ventilation control system with
LOGO! is as follows:
On
Fault
Off
Extractor fan Q1
Exhaust air flow
sensor
I3
Extractor fan
Fresh-air flow
sensor
I4
LOGO! Manual
A5E00067781 01
Master contactor
Master contactor
Stop switch
Start switch
Flow sensor
Flow sensor
Indicator lamp
Indicator lamp
I1
Q3
I2
x
x
T=
10 s
Q2
x
x
T= 10 s
x
Extractor fan
Q1
x
Exhaust air
I3
flow sensor
x
Off I2
Applications
Q1
Exhaust
fan
Q2
Fresh-air
fan
Q3
Fault
165