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"I/O" LED
is blinking
"I/O" LED
is blinking
PLC cycle
"I/O" LED
is shining
Fig. 3-13: Controller operating system
Modular I/O System
®
L
W
ON
ORKS
Switching on the
supply voltage
Is a PLC
program in the Flash
memory ?
orange
PLC program transfer
from the flash memory to RAM
Determination of the I/O modules
and the configuration
Initialization
of the system
red
Test o.k.?
Operating mode
Reading inputs, outputs and times
PLC program in the RAM
is processed
green
Writing outputs
Operating system functions,
updating times
Operating mode
No
Yes
Variables are set to 0 or FALSE
or to their initial value,
flags remain in the same status.
No
Stop
Yes
operating mode switch
is in the top position or
STOP
start command in
WAGO-IO-
Online/Start
RUN
Fieldbus data,
data of I/O modules
Fieldbus data,
data of I/O modules
operating mode switch
STOP
is in the top position or
start command in
WAGO-IO-
Online/Start
RUN
Fieldbus coupler/controller
Review
Determination of the I/O modules
and the configuration
No
Test o.k.?
Yes
PRO
32:
Online/Stop
or
Fieldbus start
behaviour as a coupler
PRO
32:
Online/Stop
or
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