User Manual

LOGO! installation and wiring
2.4 Putting into operation
LOGO!
Manual, 06/2014, A5E33039675
51
1. If neither LOGO! nor the inserted card contains a circuit program, the LOGO! Basic
displays the following:
2. LOGO! automatically copies the circuit program on the card to memory and overwrites
the existing circuit program.
3. If there is a circuit program in LOGO! or on the card, LOGO! adopts the operational state
it had prior to power-off. Versions without a display unit (LOGO!...o) automatically change
from STOP to RUN (LED changes from red to green).
4. If you have enabled retentivity for at least one function, or a function is permanently
retentive, LOGO! retains the current values at power-off.
Note
When a power failure occurs while you are entering a circuit program, the program in LOGO!
is missing after power is returned.
Before you modify the circuit program, save a backup copy of your orig
inal to a card or to a
computer using LOGO!Soft Comfort.
2.4.2
Operating states
LOGO! Base Module operating states
LOGO! Base Modules (LOGO! Basic or LOGO! Pure) have two operating states: STOP and
RUN.
STOP
RUN
• The display shows that the program is
empty when you start the program
(except for LOGO!...o devices)
• Switching LOGO! to programming mode
(except for LOGO!...o devices)
• LED is red
(only for LOGO!...o devices)
• Display: Screen mask for monitoring I/O and
messages (after START in the main menu) or for
the parameter assignment menu
(except for LOGO!...o devices)
• Switching LOGO! to parameter assignment mode
(except for LOGO!...o devices)
• LED is green
(only for LOGO!...o devices)