1756-CNBR
1756-CNBR ControlLogix is an Allen-Bradley Redundant Bridge
Interface Module that facilitates communication inside a ControlNet
Network. This redundant media device is suitable for real-time,
high-throughput industrial applications. What makes this module
different from the 1756-CNB is the presence of an additional
ControlNet port that supports redundant media. The module features
two ControlNet BNC ports whilst the 1756-CNB only features 1,
though both of them possess 1 ControlNet RJ45 port. This Redundant
Bridge Module has 5.1 Watts, 5 Megabytes per second (Mbps) and 40
to 48 Logix Communication Connections. Together with the Logix5550
Controller, the 1756-CNBR also regulates the flow of scheduled data
and bridges unscheduled data existent between ControlNet and
ControlLogix. To avoid the loss of communication when a tap is
disconnected, consider using redundant ControlNet media. For that
particular connection, the 1756-CNBR is the only suitable module.
Typically, the current from this module is 970 mA at 5.1 Volts DC
and 1.7 mA at 24 Volts DC. In addition to that, the 1756-CNBR can
support up to 20 buffers meant for unconnected messages. There are
also 99 nodes available. Before carrying out any installations,
check the label attached to the tap drop cable. This is to ensure
that any connections to the tap will not be accidentally reversed.
In the event that this is not done, reversals will occur that will
require troubleshooting and faulty status conditions to be
displayed. It utilizes the Common Industrial Protocol (abbreviated
as CIP) to combine an input/output network and a peer-to-peer
network functionality, delivering high-performance capabilities for
both functions. The 1756-CNBR has a continuous isolation voltage of
30 Volts and it occupies any chassis-based slot. It can be utilized
with both standard and redundant power supplies. If users are
installing a redundant system, they should position the primary as
well as redundant modules in a common slot in their corresponding
chassis pair.

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