1 advances in communications & reliability of power and control systems presented by john s....
TRANSCRIPT
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Advances in Communications & Reliability of Power and Control
Systems
Presented byJohn S. Levine, P.E.
Levine Lectronics and Lectric, Inc.770 565-1556
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Are you frustrated?
• Ever had problems getting on the network?
• Ever had problems getting on the web?
• How can a person with an Apple Computer send you an email when you use Microsoft Outlook?
• Why can’t I talk to these relays?
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This is all part of Communications!
• All these questions will hopefully be answered and more because:
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Overview of Topics to be covered
• Basics
• Ethernet
• Protocols
• HMI
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Basics
• Introduction• Parallel• Serial• Parity Error• Network• Open verses Closed• Standards• OSI Model
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Introduction
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Formatting
Group Address Description
Current 0300 Phase A Current0301 Phase B Current
0302 Phase C Current 030D Phase A Differential 030E Phase B Differential 030F Phase C Differential
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Parallel
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Serial
Baud Rate – A measure of how fast serial data is moving between devices per second. 2 common levels are 19, 0 BPS and 9,600 BPS
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Serial Communications
• Physical Layer– RS 232– RS 485– USB
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RS 232
Slew Rate – Speed we can go from -25 V to 25 V, limits baud rate DTE Data Terminal Equipment DCE Data Communication Equipment
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RS 485
conductors are electrically floating
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Universal Serial Bus (USB) Port
• Up to 127 devices can connect to the host, either directly or by way of USB hubs.
• Individual USB cables can run as long as 5 meters; with hubs, devices can be up to 30 meters away from the host.
• With USB 2.,the bus has a maximum data rate of 480 megabits per second.
• A USB cable has two wires for power (+5 volts and ground) and a twisted pair of wires to carry the data.
• On the power wires, the computer can supply up to 500 milliamps of power at 5 volts.
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Universal Serial Bus (USB) Port
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IEEE 1394 Interface• The IEEE 1394 interface is a
serial bus interface standard for high-speed communications and isochronous real-time data transfer, frequently used in a personal computer (and digital audio and digital video). The interface is also known by the brand names of FireWire (Apple Inc.), i.LINK (Sony), and Lynx (Texas Instruments). Though not as widely used, the 1394 standard also defines a backplane interface.
• Firewire 400-Speeds from 100, 0 or 400 Mbits/s half-duplex
• Firewire S3 0-Speeds up to 3 0 Mbits/s half-duplex
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Network
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Network
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Network Topologies
• The network topology defines the way in which computers, printers, IEDs and other devices are connected
• A network topology describes the layout of the wire and devices as well as the paths used by data transmissions.
• Commonly, referred to as a linear bus, all the devices on a bus topology are connected by one single cable.
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Standards
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OSI Model
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Developed in 1978, the Open System Interconnection has 7 layers each performing part of the communications.
1) The physical level controls the physical connections between devices, network topology, voltage levels to define 0’s and 1’s.RS232, RS485, and USB are 3 examples
2) Data link level provides framing 3) Network determines optima routing – IP of TCP/IP is based on this4) Transport level guarantees delivery and is error free – the TCP of
TCP / IP (Transport Control Protocol / Internet Protocol) is at transport level
5) Session mechanism for the establishment of a communications session between applications
6) Presentation – correct translation of data 7) Application – provides the facilities or interface to allow the
application protocols or drivers such as Modbus or DNP
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Ethernet
• Introduction
• 10/100 Base T
• Hubs and Switches
• Fiber
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Introduction
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Ethernet in Devices
DHCP - Dynamic Host Configuration Protocol
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10/100 Base T
Max distance 100 meters or 328 feet
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10/100 Base T
Cat 5 Cable
Cat 5e Cable
Cat 6 Cable for Gigabit Ethernet
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M12 Industrial Ethernet Cables
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Fiber
Power Budget
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Single and Multi Mode Fiber
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Single and Multi Mode Fiber
62.5 micrometers
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Common Fiber Connectors
ST-Straight tip SC-Subscriber Connector
Primary Ethernet Port
Secondary Ethernet Port
LC-Lucent Connector
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Eliminates 33 of
breaker terminations
Eliminate 90 of control building
terminations
40 less cabling with
no terminations
required
1,000’s of wires replaced with
few communication
cables
Hard Fiber Eliminating Complexity
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Hubs and Switches
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Industrial Switches for the Plant Floor
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Managed Switches
• Simple Network Management Protocol (SNMP): a set of protocols for managing network performance, finding and solving network problems, and planning for network growth
• Internet Group Management Protocol (IGMP): configures broadcast message behavior
• Virtual LAN (VLAN): a network of computers that behave as if they are connected to the same wire even though they may actually be physically located on different segments of a LAN
• Quality of service (QoS): Allows prioritization of packets to occur or improve performance for key channels
• Spanning Tree Protocol (STP): algorithm to prevent wiring topology mistakes or create redundancy in a network
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Hubs and Switches
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Wireless
• This is where the future is. Products are now being designed with Wireless build into the device.
• Regulated and unregulated frequencies
• Different speeds depending on the application
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Wireless Product Portfolio
• Licensed & Unlicensed Transparent• x710 Platform 9.6 kbps• TransNET 115 kbps• 5 Watt Tx Power
• eNET• 115 kbps FHSS• 900 and 2.4 GHz FHSS• Network enabled
• Up to 1 Mbps• Mobile and Fixed• Network Enabled
• Unlicensed Broadband• Data Speeds to 8 Mbps• Mobile and Fixed• Network Enabled
• NETio Platform• 115 kbps FHSS• ISM 900MHz & 2.4 Ghz• Support for IEEE802.15.4
• LEDR PTP Radio• 4 / 16 / 32 QAM Radio• Data Rates to 8 Mbps• T1 / E1 / Fractional Rates
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Router
• Definition from Wikipedia - A router is a computer networking device that forwards data packets across a network toward their destinations, through a process known as routing. Routing occurs at Layer 3 (the network layer i.e. Internet Protocol (IP) of the OSI seven-layer protocol stack.
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Other Computer Networking Devices
• Gateway: device sitting at a network node for interfacing with another network that uses different protocols. Works on OSI layers 4 to 7.
• Bridge: a device that connects multiple network segments along the data link layer. Works on OSI layer 2.
• Repeater: device to amplify or regenerate digital signals received while setting them from one part of a network into another. Works on OSI layer 1.
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Proxy, Firewall, and Port
• Proxy: computer network service which allows clients to make indirect network connections to other network services
• Firewall: a piece of hardware or software put on the network to prevent some communications forbidden by the network policy
• Computer port (hardware) - a physical interface between a computer and other computers or devices
• Computer port (software) - a virtual data connection between computer programs possibly through a computer network
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Firewalls
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Relays at L-3Wan I.P
Firewall Port Technology Destination IP Destination Port
Slave Address Device
172.165.187.153 502 Relays 192.168.1.240 502 254 F60
172.165.187.153 503 Relays 192.168.1.241 502 Multinet
172.165.187.153 503 Relays none 502 1 PQM II
172.165.187.153 503 Relays none 502 3 SPM
172.165.187.153 503 Relays none 502 45 745
172.165.187.153 503 Relays none 502 89 489
172.165.187.153 504 Relays 192.168.1.242 502 242 469
172.165.187.153 505 Relays 192.168.1.243 502 243 760
172.165.187.153 506 Relays 192.168.1.244 502 249 MM300
172.165.187.153 507 Relays 192.168.1.245 502 13 T60
172.165.187.153 508 Relays 192.168.1.246 502 2 369
172.165.187.153 509 Relays 192.168.1.247 502 50 350
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Serial to Ethernet Converters
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Serial to Ethernet Converters
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Adding Devices to a Network
• Static IP address 3.94.244.1 for devices
• Subnet 255.255.255.0 for network
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Adding Devices to a Network
DNS - Domain Name System, Internet system to translate names into IP addresses
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Checking IP Address
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Checking IP Address
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Other useful Dos Command
• ipconfig /release• ipconfig /renew• ipconfig /all (gives you IP and MAC address)• ping -t• tracert• exit• You can hit F3 to go to the previous dos command• Or you can hit the up arrow to go back to previous
dos commands
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ping
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tracert
• Black list and White list
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Useful Internet Sites
• www.Dnsstuff.com - can use to find if a web site is getting blocked or who owns it.
• www.Speakeasy.net/speedtest/ - Can use for a speed test
• www.Spinrite.com – Can use to check for leaks in your firewall
• http://www.kloth.net/services/nslookup.php get the IP address for a I.P. name.
• www.whatismyip.com – your WAN IP
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Protocols
• Modbus• Modbus Plus• DNP• DeviceNet• Profibus• Direct I/O• IEC 61850• Hart• BACnet• Protocol Converters
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Modbus
• Can be communicated via RS 232, RS485, 10/100 Base T, and 10/100 Base F
• Is half-duplex serial in all configurations• Uses a master and slaves• Data is stored in a register
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Modbus Plus
• Proprietary protocol• Can be communicated via RS485. Uses a peer-to-
peer token exchange type network. Multi-Master.• Global data can be sent with the token.• 64 nodes per network, can Bridge networks.• Speeds up to 1 MB• Up to 1800 meters with repeaters
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Digital Network Protocol (DNP 3)
• Developed by GE Harris – can time stamp data
• Scalable
• Has Client (computer) and server (device)
• Can poll for change
• Can set up for Unsolicited messaging from server
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Digital Network Protocol (DNP 3)
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DeviceNet EtherNet/IP (Ethernet Industrial Protocol)
• Based on the Controller Area Network protocol (CAN)• Managed by the Open DeviceNet Vendors Association• Bus Topology at 24 VDC• Baud rates of 125, 250, and 500 Kbps• Can have up to 64 nodes on a single local network• DeviceNet uses abstract OOT (Object-Oriented
Technique) – objects – class – instances – attributes
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DeviceNet
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Profibus
• PROFIBUS (Process Field Bus)
• Profibus-DP (Decentralized Periphery)
• PROFIBUS-FMS (Fieldbus Message Specification)
• PROFIBUS-PA (Process Automation)
• Profinet – Ethernet based Fieldnetwork
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Profibus
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Profibus
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Profibus
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Direct I/O
• 4 interface standards can be used– IEEE 37.94, Fiber, RS422, and G.703
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Direct I/O
• Great for a Main – Tie – Main application
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IEC 61850• Designed as a universal plug and play between
manufactures
• Uses descriptions instead of registers
• Generic Object Oriented Substation Event –Messaging (GOOSE Messaging)
• Ethernet is required as part of IEC 61850
The phrase “sixty-one-eight-fifty”has become a designator for the next generation
substation secondary system with a higher degree of integration, reduced cost, greater
flexibility, communication networks replacing hard-wired connections, plug-and-play functionality, reduced construction and
commissioning time, and other advantages
The phrase “sixty-one-eight-fifty”has become a designator for the next generation
substation secondary system with a higher degree of integration, reduced cost, greater
flexibility, communication networks replacing hard-wired connections, plug-and-play functionality, reduced construction and
commissioning time, and other advantages
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IEC 61860
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IEC 61850 Applications• Breaker Failure Initiate to Other Breaker• Broadcast a Trip Message to All Feeder Breakers• High Speed Bus Transfer (M-T-M)• Switching Set Groups• Load Shedding• Upstream Relay Tripping & Blocking• Bus Protection• Relay Voting• Reclose Initiation• Underfrequency Load Shedding• Transfer Tripping• Remote Start/Stop Commands• Blocking Schemes• ?
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Bus Transfer with 1 Relay
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IEC61850 Applications…
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Hart• HART (Highway Addressable Remote Transducer) Protocol is
the global standard for sending and receiving digital information across analog wires between smart devices and
control or monitoring system.
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BACnet
• BACnet (Building Automation and Control) was developed in 1987 by a group of HVAC and Building Automation professionals as a standard, open protocol specifically for the building automation industry.
• Objects– 123 Properties
• 32 Standard Services
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Protocol or Gateway Converters
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Universal GatewayProtocols available:Serial• GE Fanuc, SNP-X Master• Schneider, Modbus Master (ASCII & RTU)• Schneider, Modbus Slave (ASCII & RTU)• Schneider, Uni-Telway Slave Client/Server• Siemens, AS511 Master• Allen Bradley, DF1 Full Duplex• Siemens, TI-Dir MasterEthernet TCP/IP• Allen Bradley, EtherNet/IP PCCC• Altus, Alnet II• Alstom, SRTP• GE Fanuc, SRTP• Mitsubishi, Melsec• Omron, FINS• Schneider, Open Modbus• Schneider, Uni-TE• Siemens, Industrial EthernetProfibus• Siemens S7/MPI Client• Siemens S5 Client• DP-V0 Master/Slave Class 1 & 2
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PLC Gateways
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Human Machine Interface (HMI)
• Overview
• Plug and Play
• One-Line Viewer
• Annunciator
• OPC / DDE Server
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HMI Overview
• SCADA – Supervisory Control And Data Acquisition
• RTU – Remote Terminal Unit
• It is now extremely easy and cost effective to view your devices without having to be in front of the relays.
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Plug and Play Viewpoint Monitoring
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Dashboard
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One-Line Viewer
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One-Line Editor
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Annunciator
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Automatic Event and Waveform Retrieval
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Trending Reports
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Comtrade Files
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OPC
• The OPC Foundation is an industry consortium that creates and maintains standards for open connectivity of industrial automation devices and systems. The OPC standards specify the communication of industrial process data, alarms and events, historical data and batch process data between sensors, instruments, controllers, software systems and notification devices.
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DDE
• Dynamic Data Exchange (DDE) is a technology for communication between multiple applications under Microsoft Windows and OS/2.
• Microsoft Excel has a DDE server – you can open a Microsoft Excel spreadsheet and fill it with data, by opening a DDE conversation with Excel and sending it DDE commands.
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OPC / DDE Server
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Sources of Information
• GE Multilin Communications Training CD
• http://www.woodhead.com/products/brad/bradcommunications/
• http://www.wikipedia.org/
• http://www.profibus.com/wbt/en/wbt1/
• http://www.odva.org/
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Copy of Presentationwww.L-3.com/private/ieee/ieee communications-2010.ppt
– EASA Root Cause 0502.pdf
– Lowzero.pdf
– ConversionofElectromechanicalsettingtoDigitalsetting_r3.doc
– Motor Protection Principles.pdf
– Protection Basics_r3.ppt
– IEEE Generator Protection.ppt
– ITI CT applications.pdf
– post_glover_resistance_grounding_ 2009.ppt
– GE Digital Relays 2009.PPT
– ANSI Symbols.pdf
– ITI Basics -2-09 .ppt
– IEEE Communications- 2010.ppt
– IAS Sched 2009- 2010-Birmingham.pdf
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Thank You