The Corresponding Wiring; Circuit Program Input - Siemens Logo! Manual

Programming LOGO!
Wiring

The corresponding wiring:

L1
N
L
N
S1 switches input I1, while S2 switches input I2. The load is
connected to the relay Q1.

3.7.3 Circuit program input

Let us now write the circuit program, starting at the output
and working towards the input. LOGO! initially shows the
output:
72
S1
S2
L1 N I1 I1 I1 I1 I1 I1 I1 I2 I3
1 2 1 2
Q1 Q2
The first LOGO! output
Q1
I4 I5 I6 I7 I8
1 2 1 2
Q3 Q4
LOGO! Manual
A5E00380835-01