Fieldbus controller 750-842 • 55
Operating system
Modular I/O System
ETHERNET TCP/IP
Variables are set to 0 or FALSE
or to their initial value,
flags remain in the same status.
Switching on the
supply voltage
Initialization
of the system
Reading inputs, outputs and times
Writing outputs
Fieldbus data,
data of I/O modules
Operating system functions,
updating times
Is a PLC
program in the Flash
memory ?
No
Yes
PLC program transfer
from the flash memory to RAM
Determination of the I/O modules
and the configuration
Test o.k.?
Yes
No
Stop
Test o.k.?
No
Determination of the I/O modules
and the configuration
STOP
Operating mode
Operating mode
STOP
RUN
RUN
Fieldbus data,
data of I/O modules
Yes
Fieldbus start
behaviour as a coupler
operating mode switch
is in the top position or
start command in
WAGO-IO-
32:
or
PRO
Online/Start
Online/Stop
operating mode switch
is in the top position or
start command in
WAGO-IO-
32:
or
PRO
Online/Start
Online/Stop
“I/O” LED
is blinking
orange
“I/O” LED
is blinking
red
PLC cycle
“I/O” LED
is shining
green
PLC program in the RAM
is processed
Fig. 3-23: Controller operating system
g012941e