6
6630-2212
3. Introduction
The FD-10 is a PROFIBUS DP slave unit that is able to transfer PROFIBUS DP data via
leased lines, dialup modems or radio systems.The FD-10 is used to interface different
PROFIBUS DP networks.
All Westermo Fieldbus Adapters use the same protocol to communicate with each other
via serial interface.
3.1 Device types
There are three different types of FD-10 devices described in this manual:
• FD-10 P
Point to point and Addressed, serial transfer slave
• FD-10 A
Addressed, serial transfer master
• FD-10 N
Network, serial sending
All device types are based on the same hardware architecture, schematically shown
below.
3.2 When are FD-10 devices useful?
Where a PROFIBUS DP net require connection to one or some PROFIBUS DP units
which are so located, that they:
• can’t be included in the net due to the distance, or
• reduce PROFIBUS DP data rate below the rated required for the system, or
• disturbance in PROFIBUS DP line (transmission line)
FD-10 will, together with the transfer units (modem), act as a interconnecting line
between two or many PROFIBUS DP nets.The interconnection line protocol handle
retransmission due to disturbances (e.g. due to the use of radio network or moving
trolleys), without any limitations at the PROFIBUS DP net. From the PROFIBUS DP
master point of view the whole system will be seen as a single PROFIBUS DP net, while
the master has all PROFIBUS I/O data handling with FD-10.
In data
PROFIBUS DP
In buffer
15k
Serial transfer
PROFIBUS DP
Master control
Interface
Serial transfer
control
Out data
PROFIBUS DP
Out buffer
15k
Serial Transfer
RS-232
RS-485
Power
DC
DC
PROFIBUS DP
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