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12-20-2002
Figure Sheet 1-851-A
Page 4
SBPC-21-PB Switch/Jumper Configuration
Since the SBPC-21-PB participates in two networks at the same time, it must have two network
addresses (a FifeNet address and a Profibus node address). The FifeNet address is set via the
FifeNet serial port, which is common with many FifeNet peripherals. The Profibus master sets the
baud rate for the Profibus network. If the SBPC-21-PB is installed as the end point in a FifeNet
network, the jumpers shown below should be installed to provide network termination.
Figure 2-2: SBPC-21-PB Top View
These jumpers should be installed if the
SBPC-21-PB is at the end of a FifeNet
network. They provide network
termination. The other two jumpers
should always be installed as they
select half-duplex FifeNet
communication.
Terminated Not
Terminated
The 7-segment LED is
used to display errors or
exceptions. During normal
operation, the display will
continuously “cycle” the
outer segments.
Profibus node address switches.
See the following page for
description of these switches.
Profibus Termination
The end nodes in a Profibus DP network must be
terminated to avoid reflections on the bus line. To
accomplish this, the Profibus DP module is equipped
with a termination switch. If the module is used as the
first or last module in a network, the termination switch
must be in the ON position. Otherwise, the switch
must be in the OFF position. If an external termination
connector is used, the switch must be in the OFF
position.
The termination dip switch can only be accessed with
the SBPC-21-PB top cover removed. To enable
termination, the switch must be in the OFF position.
Termination Switch Position
OFF
Up toward top cover.
ON
Down toward circuit board.