Panel Bus Termination And Chaining Examples; Example: Chaining A Control Panel - ABB FDPI-02 User Manual

28 Electrical installation

Panel bus termination and chaining examples

Bus termination is required to prevent signal reflections from the bus cable ends. If
a control panel is connected to the bus end, it terminates the bus and only the other
end must be terminated. In the last FDPI-02 interface unit of the bus, termination
switch S1 of the interface unit must be turned to the TERMINATED position. In the
following examples, ZCU-13 is used as the control unit.

Example: Chaining a control panel

￭
The following figure shows how a control panel is chained to several drives.
FDPI-02
X1 X2 X3
ZCU
-13
Ethernet cable
FDPI-02
X1 X2 X3
ZCU
-13
FDPI-02
X1 X2 X3
ZCU
-13
Ethernet cable
FDPI-02
S1
TERMINATED
X1 X2 X3
ZCU
-13