ABB CBV-2U4-3T User Manual page 11

Wiring the RS-485 Network
Wiring the RS-485
end of the network will be connected to the subnet of the Target or fieldbus of router. At the other end of the
network, the last device must be "terminated" by either installing a 100 ohm to 120-ohm resistor or, if the last
device is a CBV-2U4-3T(-N), users can switch the
network. The shield, or drain wire, must be carried through the entire network. If the
to a Target, then the shield will be grounded at the Target. If it is wired to a router, the shield must be grounded
at one point on the network as shown below:
Network-level Controller or CBV-2U4-3T(-
Router
Termination
Shield connected at end switch set to
of network only
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network involves connecting the
Network Segment
N) end
Network
Shield continuous
throughout the
OFF network
Installation Overview
CBV-2U4-3T(-N) |
and terminals in a daisy-chained configuration. One
A+ B-
"Fieldbus Terminator" to
on
- - - - - - CBV-2U4-3T(-N)
Network cable segment Termination switch
daisy-chained to next set to ON at end of
device
. This will effectively terminate the
RS-485 network is wired
Network end
Network
Shield connected to
earth at one end of
network network only
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