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Section 11 Autobaud Function
11.1 Autobaud Port 1 Sequence
11.2 Autonode Sequence for Fieldbus Use Function
Adapt the serial communication speed and parity of
the C4 modules to the connected supervision terminal
or PLC. If a fieldbus card (port 2) is used then port 1
settings must remain at factory settings.
Green LED L1 “STATUS” mentioned in the procedure
can vary its behavior based on parameter Ld.1, which
is set to a default value of 16.
Procedure
1. Connect the serial cables for all modules on the net-
work to serial 1 and to the supervision terminal.
2. Set the rotary switch on the C4 modules to be in-
stalled, or on all modules present in case of first in-
stallation, to position “0+0”.
3. Check that the green “STATUS” LEDs flash at high
frequency (10Hz).
4. The supervision terminal must transmit a series of
generic “MODBUS” read messages to the network.
5. The procedure is over when all of the green L1
“STATUS” LEDs on the C4 modules flash at a nor-
mal frequency (2Hz) (if parameter 197 Ld. 1 = 16 as
default).
The new speed parameter is saved permanently in each
C4; therefore, the “AUTOBAUD SERIAL 1” sequence
does not have to be run at subsequent power-ups.
When the rotary switch is turned, the green “STATUS”
LED stays on steadily for about 6 seconds, after which
it resumes.
Function
Autonode should be run for all field bus installations.
The L1 “STATUS” green LED mentioned in the proce-
dure can vary its behavior according to the Ld.1 pa-
rameter which is 16 as default.
11.2 Autonode Sequence for Fieldbus Use
Procedure
1. Connect the serial cables to all the module in the
serial 1 network, disconnect supervision or C4-OP
terminals.
2. Turn the rotary switches from the set node address
to the position “A + 0”.
3. Check that the “STATUS” green LED is blinking at
an average frequency (5Hz) for 10 seconds and then
that it returns to normal blinking (2Hz).
4. Turn the rotary switches in the position of the node
address.
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