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Transcript
Advances in Communications & Reliability of Power and Control Systems Presented by John S. Levine, P.E. Levine Lectronics and Lectric, Inc. 770 565-1556 [email protected] 1 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? 2 • All these questions will hopefully be answered and more because: This is all part of Communications! 3 Overview of Topics to be covered • Basics • Ethernet • Protocols • HMI 4 Basics • • • • • • • Introduction Parallel Serial Parity Error Network Standards OSI Model 5 Introduction 6 Formatting Word – Could be 16,32, or 64 bits Group Address Description Current 0300 0301 0302 030D 030E 030F Phase A Current Phase B Current Phase C Current Phase A Differential Phase B Differential Phase C Differential 7 Parallel 8 Serial Baud Rate – A measure of how fast serial data is moving between devices per second. 2 common levels are 19, 200 BPS and 9,600 BPS and now 115,200 BPS 9 Serial Communications • Physical Layer – RS 232 – RS 485 – USB 10 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 11 RS 485 conductors are electrically floating 12 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 Mb per second. • With USB 3.,the bus has a maximum data rate of 4.80 Gb 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. Type A Type B 13 Universal Serial Bus (USB) Port 14 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, 200, or 400 Mbits/s half-duplex • Firewire S3200-Speeds up to 3200 Mbits/s half-duplex 15 Network 16 Network 17 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. 18 PRP Parallel Redundant Protocol 19 Standards 20 2008 Proposed IEEE C37-2 Revision presented at Georgia Tech Relay Conference Copy at www. L-3.com/IEEE 21 OSI Model 22 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 this 4) 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 23 Ethernet • • • • Introduction 10/100/1000 Base T Hubs and Switches Fiber 24 Introduction 25 Ethernet in Devices Relays do not use DHCP - Dynamic Host Configuration Protocol 26 10/100 Base T Max distance 100 meters or 328 feet 27 10/100/1000 Base T Cat 5 Cable Cat 5e Cable Cat 6 Cable (up to 250 Mhz) Cat 6A (Augmented-up to 500 Mhz) 28 Power over Ethernet (POP)How does it work? Note: RJ45 Socket Pin-out RJ45 Connector Pin-out Source - http://pinouts.ru/Net/poe_pinout.shtml Which pin-out to use is determined by an interrogation between the switch and the end device. All wiring is STANDARD EtherNet. Fiber Power Budget 30 Single and Multi Mode Fiber 31 Single and Multi Mode Fiber 62.5 micrometers and now 50 micrometers 32 Common Fiber Connectors ST-Straight tip LC-Lucent Connector SC-Subscriber Connector Primary Ethernet Port Redundant Ethernet Port 33 Traditional Switchyard Construction Traditional Breaker Wiring Traditional Cable Trench Thousands of Copper Wires from Switchyard Labor Intensive Copper Wiring on Relay Panels Hard Fiber Eliminating Complexity Eliminates 33 of breaker terminations 40 less cabling with no terminations required Eliminate 90 of control building terminations 1,000’s of wires replaced with few communication cables 35 Hubs and Switches 36 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 • Rapid Spanning Tree Protocol (RSTP): algorithm to prevent wiring topology mistakes or create redundancy in a network 37 Industrial Switches for the Plant Floor 38 Hubs and Switches 39 Wireless • This is where the future is. Products are now being designed with Wireless build into the device. • Regulated and unregulated frequencies – 900 Mhz – 2400 Mhz – 1800 / 3650 / 5800 Mhz • Different speeds depending on the application • As the Frequency goes up, the distance goes down 40 41 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. Wikipedia and Linux are written collaboratively by volunteers and are “open source” and free. 42 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. 43 Other Terms • PRP – Parallel Redundancy Protocol – Two completely separate Lans going to the same device • Bandwidth – max data transfer rate • Server - computer programs running to serve the requests of other programs, the "clients“ • VPN – Virtual Private Network • RSTP - Rapid Spanning Tree Protocol – determines the path the message will take between 2 nodes 44 Other Terms • IRIG-B – Time code accurate to 10 ms • SNTP – Simple Network Time Protocol – typically 1 to 2 ms • PTP (Presion time Protocol) time distribution technologies sub-microsecond accuracy • QoS- Quality of Service – Overall performance of the network 45 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 (COM1) • Computer port (software) - a virtual data connection between computer programs possibly through a computer network 46 Firewalls From a Linksys router 47 Relays at L-3 Wan I.P Firewall Port LAN Port Slave Address Technology LAN IP Device 172.165.187.153 502 Relays 192.168.10.240 502 254 F60 172.165.187.153 503 Relays 192.168.10.241 502 172.165.187.153 503 Relays 192.168.10.241 502 1 PQM II 172.165.187.153 503 Relays 192.168.10.241 502 3 SPM 172.165.187.153 503 Relays 192.168.10.241 502 45 745 172.165.187.153 503 Relays 192.168.10.241 502 89 489 172.165.187.153 504 Relays 192.168.10.242 502 242 469 172.165.187.153 505 Relays 192.168.10.243 502 243 760 172.165.187.153 506 Relays 192.168.10.244 502 249 MM300 172.165.187.153 507 Relays 192.168.10.245 502 13 T60 172.165.187.153 508 Relays 192.168.10.246 502 2 369 172.165.187.153 509 Relays 192.168.10.247 502 254 350 Multinet Serial to Ethernet Converters 49 Serial to Ethernet Converters 50 Adding Devices to a Network • Static IP address 3.94.244.1 for device • Subnet 255.255.255.0 for network – Go to Network and Sharing Center – Change adapter settings – Right click for properties 51 Adding Devices to a Network DNS - Domain Name System, Internet system to translate names into IP addresses IP v4 and IP v6 (8 groups of 4 hex digits 0db8:2001:85a3:0000:0000:8a2a:0370:7334) 52 Checking IP Address 53 Checking IP Address 54 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 55 ping 56 tracert • Black list and White list • Gray list 57 Useful Internet Sites and Programs • 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 • Wireshark - http://www.wireshark.org/ 58 59 Wireshark 60 Protocols • • • • • • • • • • • Modbus Modbus Plus DNP DeviceNet and EtherNet/IP Profibus and Profinet Direct I/O IEC 61850 Hart BACnet EtherCat Protocol Converters 61 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 registers 62 Modbus Plus • Proprietary protocol • Can be communicated via RS485. Uses a peer-topeer 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 63 Digital Network Protocol (DNP 3) • • • • • • Developed by GE Harris – can time stamp data Scalable Has Client (computer) and server (device) Also called Master and Slave Can poll for change Can set up for Unsolicited messaging from server • Can provide only changed values. • Can Prioritize messages 64 Digital Network Protocol (DNP 3) 65 DeviceNet (serial) 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 66 DeviceNet 67 Profibus (serial) Profinet (ethernet) • Profibus (Process Field Bus) • Profibus-DP (Decentralized Periphery) • Profibus -FMS (Fieldbus Message Specification) • Profibus -PA (Process Automation) • Profinet – Ethernet based Field network 68 Profibus 69 Profibus 70 Profibus 71 Direct I/O • 4 interface standards can be used – IEEE 37.94, Fiber, RS422, and G.703 72 Direct I/O • Great for a Main – Tie – Main application 73 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 74 IEC 61860 75 76 IEC 61850 Applications • Breaker Failure Initiate to Other Breaker • Broadcast a Trip Message to All Feeder Breakers – (Bus Differential) • • • • • • • High Speed Bus Transfer (M-T-M) Switching Set Groups Upstream Relay Tripping & Blocking Bus Protection Relay Voting Reclose Initiation Load Shedding – KW or KVA Load Shedding – Underfrequency Load Shedding • Transfer Tripping • Remote Start/Stop Commands 77 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. 78 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. It is an ASHRAE, ANSI, and ISO standard protocol. • Protocol – The BACnet protocol defines a number of services that are used to communicate between building devices. The protocol services include Who-Is, I-Am, Who-Has, I-Have, which are used for Device and Object discovery. Services such as Read-Property and Write-Property are used for data sharing. The BACnet protocol defines a number of Objects that are acted upon by the services. The objects include Analog Input, Analog Output, Analog Value, Binary Input, Binary Output, Binary Value, Multi-State Input, Multi-State Output, Calendar, EventEnrollment, File, Notification-Class, Group, Loop, Program, Schedule, Command, and Device. 79 EtherCat • EtherCat is an Ethernet based fieldbus system designed for extremely fast data update times in the range of < 100 µs. • The Standard Ethernet packet or frame is no longer received, interpreted, and copied as process data at every node. The EtherCAT slave devices read the data addressed to them while the telegram passes through the device, processing data "on the fly". Similarly, input data are inserted while the telegram passes through. A frame is not completely received before being processed; instead processing starts as soon as possible. Sending also is conducted with a minimum delay of small bit times. 80 Protocol or Gateway Converters 81 Universal Gateway There are Universal Gateways and controllers that collects metering, status, event, and fault report data from serial or LAN based Intelligent substation devices. The Gateways summarizes data from the substation devices and makes it available locally/remotely through a standard secure web browser (HTTPS). 82 Human Machine Interface (HMI) • • • • • Overview Plug and Play One-Line Viewer Annunciator OPC / DDE Server 83 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. 84 Plug and Play Viewpoint Monitoring 85 Dashboard 86 One-Line Viewer 87 One-Line Editor 88 Annunciator 89 Automatic Event and Waveform Retrieval 90 Trending Reports 91 Comtrade Files 92 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. 93 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. 94 OPC / DDE Server 95 Sources of Information • • • • • • GE Multilin Communications Training CD http://www.wikipedia.org/ http://www.profibus.com/wbt/en/wbt1/ http://www.odva.org/ http://www.dnp.org/ http://www.gedigitalenergy.com/resources.htm 96 Website: www.L-3.com 97 Thank You 98