48 • Fieldbus Coupler
Fieldbus Coupler 750-346
WAGO-I/O-SYSTEM 750
DeviceNet
3.1.2.7 Setting the Baud Rate
The bus coupler supports 3 different Baud rates, 125 kBaud, 250 kBaud and
500 kBaud. DIP switches 7 and 8 are used to set the baud rate.
Baudrate DIP7 DIP8
125 kBaud
*)
OFF OFF
250 kBaud ON OFF
500 kBaud OFF ON
not allowed ON ON
ON
12
345
ON
67
8
8
7
6
5
4
3
2
1
g012549x
Fig. 3-7: Example: Setting the baud
rate 250 kBaud (DIP 7 = ON) on a
station (node) with the address MAC
ID 1.
*)
Presetting
The configuration is only read during the power up sequence. Changing the
switch position during operation does not change the configuration of the bus-
coupler. Turn off and on the power supply for the fieldbus coupler to accept
the DIP switch change.
The default setting is Baud rate 125 kB.
3.1.3 Operating System
Following is the configuration of the master activation and the electrical in-
stallation of the fieldbus station.
After switching on the supply voltage, the coupler performs a self test of all
functions of its devices, the I/O module and the fieldbus interface. Following
this the I/O modules and the present configuration is determined, whereby an
external not visible list is generated.
In the event of a fault the coupler changes to the "Stop" condition. The "I/O"
LED flashes red. After clearing the fault and cycling power, the coupler
changes to the "Fieldbus start" status and the "I/O" LED lights up green.
Fig. 3-8: Operating system - Power on g012113e
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