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ControlNet
Network
Advantages
The Allen-Bradley ControlNet network is a state-of-the-art control network that
meets the demands of real-time, high- throughput applications. The ControlNet
network combines the functionality of an I/O network and a peer-to-peer network
while providing high-speed performance for both functions.
The ControlNet network gives you deterministic, repeatable transfers of all
mission-critical control data in addition to supporting transfers of
non-time-critical data. The patented media-access method used on the ControlNet
network results in deterministic delivery of time-critical (scheduled) data by
assigning it a higher priority than non-time-critical (unscheduled) data. As a
result, I/O updates and controller-to-controller interlocking always take
precedence over program uploads and downloads and messaging.
The ControlNet network and products such as the ControlNet-to-DeviceNet
Linking Device (catalog number 1788-CN2DN), help deliver solutions that
integrate FOUNDATION Fieldbus
devices and DeviceNet devices into a common,
seamless architecture.
Functional Design
The ControlNet network is simple and cost-effective to install, and offers you
flexible installation options. A-B offers PLC processors with built-in
ControlNet scanners, ControlNet adapters for I/O chassis, and ControlNet
computer interfaces for personal computers. Although the ControlNet network is
based on bus technology, you can use repeaters to implement tree and star
topologies. You can also install optional redundant media. The ControlNet
processors include ports that let you share data between a ControlNet network
and your already installed Data Highway Plus and Universal Remote I/O networks.
Types of devices that communicate on the ControlNet link include:
controllers, I/O, MMIs, PCs, drives, coordinated drive systems, weld control,
motion control, vision systems, transducers, and valve manifolds.
Features
Implements programming, processor-to processor, and
I/O control on the same link w/o impacting time-critical I/O
Media redundancy and intrinsically-safe options
Provides the functions of the Data Highway Plus and
Universal Remote I/O networks at a 5M-bit/s rate
Offers high-speed data throughput, which improves I/O
performance and controller-to-controller interlocking
Supports a maximum of 99 nodes, with no minimum
distance between them
Provides simple, flexible installation and tuning
that does not require special tools
Lets you access the network from any node for PLC
processor programming and troubleshooting
Multicast of both inputs and peer-to-peer data for
reduced programming
Incorporates improved system diagnostics, which make
it easier to configure and maintain
Has finer granularity of I/O
Gives you deterministic, repeatable transfers of data
to/from digital and analog I/O
Lets you select I/O and PLC processor interlocking
update times that match your application requirements
Lets processors communicate with multiple devices
with the same transmission
Eliminates block-transfer programming
Is compatible with a range of current Allen-Bradley products, and will be
compatible with more in the future
Provides operation through high-noise environment
with fiber-optic segments
Messages from/to a node on one ControlNet link to
be routed through the ControlLogix gateway to/from a node on either another
ControlNet link, a DH+ link, or an Ethernet link
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