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Manual – DFD11B DeviceNet Fieldbus Interface
5
Configuring PLC and master (DeviceNet scanner)
Project Planning and Startup
5.2.3
Auto setup for gateway operation
The auto setup function lets you start up the DFD11B as gateway without a PC. The
function is activated via the Auto Setup DIP switch (see section 4.4 page 16)
As a first step, the DFD11B searches for drive inverters on the lower-level SBus. This
process is indicated by the
H1
LED (system bus error) flashing briefly. For this purpose,
different SBus addresses must be set for the drive inverters (P881). We recommend as-
signing the addresses beginning with address 1 in ascending order based on the ar-
rangement of inverters in the switch cabinet. The process image on the fieldbus side is
expanded by three words for each detected drive inverter.
The
H1
LED remains lit if no drive inverter was located. A total of up to eight drive invert-
ers is taken into account.
After the search is completed, the DFD11B periodically exchanges three process data
words with each connected drive inverter. The process output data are fetched from the
fieldbus, divided into blocks of three and transmitted. The drive inverters read the pro-
cess input data, put them together and send them to the fieldbus master.
The cycle time of the SBus communication is 2 ms per node at a baud rate of 500 kBit/s
without any additional engineering activities.
Thus, for an application with 8 inverters on the SBus, the cycle time of the process data
update is then 8 x 2 ms = 16 ms.
NOTE
Setting the Auto-Setup DIP switch (AS) from OFF to ON position causes the function
to be executed once.
The Auto Setup DIP switch must then remain in the ON po-
sition.
The function can be reactivated by turning the DIP switch off and back on again.
NOTE
If you change the process data assignment of the drive inverters connected to the
DFD11B, you have to activate Auto Setup again because the DFD11B saves these
values only once during Auto Setup. The process data assignments of the connected
drive inverters may not be changed dynamically after Auto Setup.
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