Operating States - Siemens LOGO! Manual

2.4.3

Operating states

LOGO! Base Module operating states
LOGO! Base Modules (LOGO! Basic or LOGO! Pure) have two operating states: STOP and
RUN.
•
•
•
Action of LOGO!:
•
•
•
Note
After switching the power on, the system briefly switches through the outputs on the LOGO
24/24o or LOGO! 24C/24Co. With an open circuit, a voltage of > 8 V can occur for up to
approximately 100 ms; when loaded, this time reduces to a matter of microseconds.
LOGO! expansion modules, operating states
LOGO! expansion modules have three operating states: The LED (RUN/STOP) is lit green,
red or orange.
The expansion module com-
municates with the device to the
left.
LOGO!
Manual, 10/2017, A5E01248535-AA
STOP
The display shows: 'No Program' (not
LOGO!...o)
Switching LOGO! to programming mode
(not LOGO!...o)
LED is red
(only LOGO!...o)
The input data is not read.
The circuit program is not executed.
The relay contacts are permanently open or
the solid-state outputs are switched off.
Green (RUN)
Display: Screen mask for monitoring I/O and
•
messages (after START in the main menu)
(not LOGO!...o)
Switching LOGO! to parameter assignment
•
mode
(not LOGO!...o)
LED is green
•
(only LOGO!...o)
Action of LOGO!:
LOGO! reads the status of the inputs.
•
LOGO! uses the circuit program to calculate
•
the status of the outputs.
LOGO! switches the relay/solid-state outputs
•
on or off.
LED (RUN/STOP) is lit
Red (STOP)
The expansion module does not
communicate with the device to
its left.
LOGO! installation and wiring
2.4 Putting into operation
RUN
Orange/Yellow
Initialization phase of the ex-
pansion module
55