Wireless: No doubts about IEEE 802.11n advantages, say Rockwell Automation, Cisco

IEEE 802.11n wireless protocol offers industrial automation networking applications better performance for control, said Rockwell Automation and Cisco at Automation Fair. Graphs are provided on protocol performance.


Better performance with "n"

IEEE 802.11n wireless protocol has:

- Throughput up to six times existing wireless networks,

- Better packet retry handling, and

- Backward compatibility, according to Cisco and Rockwell Automation.

See graphs and detailed list of advantages, below.


IEEE 802.11n wireless protocol offers industrial automationnetworking applications better performance for control and automation, with throughputup to 6x existing wireless networks, better packet retry handling, plusbackward compatibility.

Wireless is about eliminating costbecause cabling can be unreliable. Further, IEEE 802.11n wirelessprotocol has additional advantages, including up to six times thethroughput of existing wireless networks, explained Paul Brooks,business development manager, networks portfolio, for RockwellAutomation.

Brooks and Dan Knight, Cisco industry solutions manager, during an Automation Fair presentation in November 2009, touted the benefits of wireless, saying that wireless makes people more efficient and effective. It helps locate people and equipment more quickly, and it makes video surveillance much more economical. And IEEE 802.11n is particularly well suited for industrial monitoring and control, especially in applications where cabling is impractical or might fail. Often, a combination of wired and wireless technologies can quickly provide the best possible implementation, Brooks said. In one of many examples provided, Knight explained how Metroline Greenhouses, with 5.8 million square ft, reduced inventory by 15%, improvement worker productivity, with same staffing.

Rockwell Automation has been working with Cisco on industrial Ethernet network, most recently using the Cisco unified wireless network. Brooks and Knight said the unified wireless network is architecturally flexible, can stand alone in an application, or can operate with a controller-based solution, with components, as needed, for the application.

IEEE 802.11n protocol ha s :
- Multiple input and multiple output (MIMO) capabilities, which increases fidelity.
- 40 MHz, packet aggregation (like carpooling), and multiple antennae capability, which can multiply throughput (more lanes on the highway);
- Fewer transmissions and acknowledgments, which helps with many control applications;
- Backward compatibility with IEEE 802.11a, b, and g in 2.4 and 5 GHz, for less interference and more channel operations; and
- Twice the reliability and predictability.
Enhanced testing, Brooks said, has demonstrated:
- Point to multi-point capability providing wire-speed performance through a wireless network;
- Packet aggregation of up to 19,000 packets per second;
- Zonal coverage to find non-overlapping channel. This is made possible with 21 channels using 5 GHz, compared to 3 channels in 2.4 GHz.
- Up to 300,000 packets/sec of data are possible using multiple radios and channels; and
- Radio frequency co-existence is possible, IEEE 802.11 b/g and n with IEEE 802.15.4. Four channels are available and the network will locate others as available in real time.
"For the right applications, this is very suitable technology," Brooks said.

Also read from Control Engineering :
- Transparent Wireless at Cano Petroleum ;
- Switch to industrial Ethernet switches; rugged advantages ; and
- Manufacturing convergence: IT, Ethernet drive integration, say Rockwell Automation, Cisco .


IEEE 802.11n is about much more than speed, according to a Rockwell Automation and Cisco presentation at Automation Fair.

IEEE 802.11n is about much more than speed, according to a Rockwell Automation and Cisco presentation at Automation Fair. Rockwell Automation provides a PDF of the presentation here www.rockwellautomation.com/events/automationfair/get/presentations/AF2009Tech42.pdf.

- Mark T. Hoske, editor in chief, Control Engineering www.controleng.com

No comments
The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by...
The System Integrator Giants program lists the top 100 system integrators among companies listed in CFE Media's Global System Integrator Database.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
This eGuide illustrates solutions, applications and benefits of machine vision systems.
Learn how to increase device reliability in harsh environments and decrease unplanned system downtime.
This eGuide contains a series of articles and videos that considers theoretical and practical; immediate needs and a look into the future.
Big Data and IIoT value; Monitoring Big Data; Robotics safety standards and programming; Learning about PID
Motor specification guidelines; Understanding multivariable control; Improving a safety instrumented system; 2017 Engineers' Choice Award Winners
Selecting the best controller from several viewpoints; System integrator advice for the IIoT; TSN and real-time Ethernet; Questions to ask when selecting a VFD; Action items for an aging PLC/DCS
This digital report will explore several aspects of how IIoT will transform manufacturing in the coming years.
Motion control advances and solutions can help with machine control, automated control on assembly lines, integration of robotics and automation, and machine safety.
This article collection contains several articles on the Industrial Internet of Things (IIoT) and how it is transforming manufacturing.

Find and connect with the most suitable service provider for your unique application. Start searching the Global System Integrator Database Now!

Future of oil and gas projects; Reservoir models; The importance of SCADA to oil and gas
Big Data and bigger solutions; Tablet technologies; SCADA developments
SCADA at the junction, Managing risk through maintenance, Moving at the speed of data
Automation Engineer; Wood Group
System Integrator; Cross Integrated Systems Group
Jose S. Vasquez, Jr.
Fire & Life Safety Engineer; Technip USA Inc.
click me