Using FreeWave Wireless with EtherNet I/P for Rockwell Solutions Curt Goldman- Business Development...

Using FreeWave Wireless with EtherNet I/P for Rockwell Solutions

Using FreeWave Wireless with EtherNet I/P for Rockwell SolutionsCurt Goldman- Business Development Manager

Randy Maes- Rockwell SpecialistOctober 4, 2011

04/19/23© 2011 FreeWave Technologies, Inc. 2

1. EtherNet I/P Basics

2. Radio Modem Basics – WiFi vs. FreeWave FHSS 900 MHz

3. FreeWave EtherNet Product Offering

4. Applications using Rockwell with EtherNet I/P Wireless

FreeWave EtherNet for RockwellAgenda

Not all EtherNet is created equal

Not all EtherNet is created equal

FreeWave Modems and EtherNet/IP

EtherNet/IP Basics


• EtherNet/IP was developed by Rockwell as their EtherNet communications protocol

• Adopted and now managed by the ODVA (Open DeviceNet Vendors Association) as the standard for Industrial Automation EtherNet communications

• Uses CIP (Common Industrial Protocol) in its upper layer

• Two basic versions

−UDP/IP

−TCP/IP

EtherNet IP Basics


UDP/IP• Implicit messaging• Also referred to as “Producer/Consumer”• Designed for I/O data exchange• Connection is “always on”

− Data is always being exchanged− Depending on size of network, can be very “bandwidth”

intensive− If four packets in a row are missed, the connection is broken

and re-established • This will take upwards of eight seconds

• No message instruction needed in ladder logic to move data from one point to another

• Only available in Logix based processors (ControlLogix, CompactLogix)

EtherNet IP Basics


TCP/IP• Explicit messaging

• “Message Instruction” based communications

• Only active when a message instruction is enabled

• Requires ladder logic

• Not bandwidth intensive

• Available in all EtherNet enabled Allen Bradley processors

EtherNet IP Basics

Radio Modem Basics


• In the Industrial Automation world, there are two basic types of radio modems used for EtherNet communications

− DSSS

• 802.11(x) or WiFi

− FHSS

• 900MHz Frequency Hopping Spread Spectrum

Radio Modem Basics


802.11 compared to FHSS• 2.4GHz and/or 5.8GHz frequency range• Can operate as a Peer to Peer network• Typically higher throughput speed• “Open” protocol

− Any WiFi device can connect with any other WiFi device• Easily interfered with (when compared to FHSS)• Consumer based products

− Chip sets, supporting components manufactured for consumer market

• Usually means lower quality because of “mass production”• Sharing frequency bandwidth the all other “WiFi” products

• Typically much lower transmit power− 250mW considered high power

• Much lower receiver sensitivity− -94 dBm @ 1Mbps*− -72d Bm @ 54Mbps*

*Rated Mbps is “over the air” rating. Actual throughput is usually less than half rated speed

Radio Modem Basics


FHSS compared to 802.11• 900MHz frequency range (typically)• Much more robust than DSSS• Operates as a “Master/Slave” network• “Proprietary” protocol

− Only FreeWave modems will talk with FreeWave modems

• Very difficult to interfere with− Very solid communications even in harsh RF environments

• Industrial grade products− Chip sets, supporting components manufactured for industrial market

• Typically much higher transmit power− 1 watt output

• Much higher receiver sensitivity− -110 dBm @ 115Kbps− -96 dBm @ 867Kbps

Radio Modem Basics

Security


• Because “WiFi” is an “open” standard, security needs to be handled at the application layer

• Any WiFi radio will connect with any other WiFi radio at the RF level

• To make the application secure, encryption must be added to the application layer

− Encryption adds data and processing to the data layer

Security


• FreeWave’s FHSS radios use a proprietary or “closed” RF protocol

−Only a FreeWave Radio will connect to a FreeWave radio

• Close protocol radios provide a level of security that cannot be matched with encryption

• Because encryption is required by spec in many applications FreeWave does offer AES 128 bit encryption

Security

Product Offerings

“ Plus” stands for EtherNet(“packet radio”)

• FGR2-PE Family− Long distance

• HTplus Family− High throughput

FreeWave EtherNet Product Offering

1.2 Mbps

867 kbps

614 kbps

154 kbps

115 kbps

10 mi 20 mi 30 mi 40 mi 50 mi 60 mi

Fast

Far

DISCLAIMER: Actual results may vary and depend on individual RF conditions such as Antenna height, RF link, Interference etc. The information contained herein is based on assumptions and tests which we believe to be reliable but is not guaranteed by us as being accurate and does not purport to be a complete statement or summary of the available data. The owner, publisher, editor and their associates are not responsible for errors and omissions. Any opinions expressed are subject to change without notice. We encourage customers to supplement the information in this graphic with independent research and other professional advice.

FGR2-PE

HTplus-RE

Product Positioning

18

Din Rail MountShoe Mount

© 2011 FreeWave Technologies, Inc. Company Confidential

FGR2-PE

LONG RANGE Industrial EtherNet data radio

• Two serial ports(EIA-232/422/485)

• Two EtherNet ports (10/100), switched

• New rugged enclosure− Installation friendly, all

connectors and lights on one side

• Backwards compatible with FGRplus− 115 kbps RF data rate

19© 2011 FreeWave Technologies, Inc. Company Confidential

Superior RF Performance• Sensitivity & Selectivity

Multiple Protocol• Both serial & EtherNet

Maximum Flexibility• Single Radio Solution

Rugged & Reliable• -40° to +75° C Temperature

range

Secure

FGR2-PE Value Proposition

20© 2011 FreeWave Technologies, Inc. Company Confidential

Security

Multi-Layered Approach• Frequency Hopping Spread

Spectrum

• Call Book (Point-to-Point)

• Radius Authentication

• SSL (Transport Layer Security)

• Encryption (AES)

• VLAN (Privacy)

• MAC Address Filtering

HTplus-RE

• High speed EtherNet radio 867 Kbps over-the-air data rate

• Superior interference rejection

• Range of 15 miles

• -40° to +60° C Temperature range

• Multiple protocol, serial & EtherNet

• Gateway, Endpoint, or Repeater in one radio

HTplus-RE Value Proposition

Security• AES 128 bit

• Radius Central Authentication

• VLAN Tagging

• SNMP

• Mac filtering

Fast Hopping• Provides superior interference rejection

• Current hop rate is 500-1000 x per second

Over the air data rate up to 867 Kbps• Data rate at ~540 Kbps @ 867

• Data rate at ~360Kbps @ 614

Range• 15 mile link with LOS

• Ability to extend further through repeaters

Error Free Communications• 32 bit CRC with automatic retransmission

• Receive sensitivity -102dBm (10-4 BER)

Applications


When creating an application that needs wireless EtherNet communications, the goals of the application needs to be looked at first

• How robust must the application be?

• How crowded is the RF environment?

• How much data really needs to be moved from one processor to another?

Applications

Applications UDP/IP

With UDP/IP a connection:• A connection is established between the consuming

processor and the producing processor

• This connection uses missing packets to determine the health of the connection

• There is no “flow control” in UDP/IP other than RPI (Requested Packet Interval)−RPI controls how frequently a packet will be

“produced/consumed” but does not control when this takes place

−With lack of flow control, it is possible to have any number of packets to be “in transit” at the same time

• There is no “Master/Slave” relationship within a given network

UDP/IP connection do’s:• Determine what data really needs to be moved from one

processor to another and only move those tags and/or I/O points

• Set the RPI to the highest number that the application will tolerate

• Structure your application so that one processor is the network master (host) and connect that processor with the radio network gateway (master)

• Use “Rack Optimization” whenever possible

UDP/IP connection don’ts • Don’t forget your radio network is a “master/slave” type network

• Underestimate the amount of bandwidth that UDP/IP can consume

Applications UDP/IP

Applications TCP/IP

With TCP/IP connection:• When a message instruction is enabled;

−A connection is established

−The data is sent and acknowledged

−The connection is closed

• It is very easy to provide “flow control”

• While any processor in the network can initiate communications, best practice is to have a network master controlling all of the communications

Applications TCP/IP

TCP/IP connection do’s:• Stagger message your message instructions

• Structure you network so that one processor is the network master (host) and connect that processor with the radio network gateway (master)

• Only move data that really needs to be moved from one processor to another

TCP/IP connection don’ts• Don’t forget that the radio network is a “master/slave”

type network


Whether or not you are using UDP/IP or TCP/IP always remember to plan ahead. It’s common that the wireless aspect of an application is overlooked when in the planning stage. This can result in poor performance and a troublesome system. While “WiFi” type radios appear on the surface to “cover it all” the reality is they can’t compete with the robustness, reliability and security that is provided with FreeWave’s FHSS radios.

With a little upfront planning and remembering the wireless system when setting your goals it is possible to have not only all of the application needs met but also having them met with the highest level of security and reliability possible in today’s wireless world.

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Using FreeWave Wireless with EtherNet I/P for Rockwell Solutions Curt Goldman- Business Development...

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