Siemens LOGO! 24RC Manual page 55

What does "LOGO! is in RUN?" mean?
In RUN, LOGO! executes the program. First of all it reads
the states of the inputs, uses the program you have speci-
fied to determine the states of the outputs, and switches
the relays at the outputs on or off.
LOGO! represents the state of an input or output as fol-
lows:
I:123456
Mo 09:00
Q:1234 RUN
State display
Let's have a look at that in our example:
L1
N
LOGO! Manual
A5E00067781 01
Input/output has the state '1':
inverse
Input/output has the state
'0': not inverse
S1 S2
=1
I1 I2
I:123456
Mo 09:00
Q:1234 RUN
Q1
Programming LOGO!
I:12345678
9 10 11 12
Mo 09:00
Q:12345678
When switch S1 is closed,
voltage is applied to input I1,
which has the state '1'.
LOGO! calculates the states
of the outputs with the pro-
gram.
Output Q1 has the state '1'
here.
When Q1 has the state '1',
LOGO! operates relay Q1
and the consumer at Q1 is
supplied with voltage.
47