Practical_modern_SCADA_protocols_-_dnp3,_60870-5_and_Related_Systems

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166 Practical Modern SCADA Protocols: DNP3, 60870.5 and Related Systems Figure 6.1 Typical network topology The technical information in the following sub-sections is derived from the DNP3 document Transporting DNP3 over Local and Wide Area Networks, Version 1.0, December 1998. This document is available from the DNP3 User Group website and should be examined if more in depth information is required. 6.7.2 Internet protocol suite The Internet protocol suite is the group of programs that provide the services of the Internet. These include Internet protocol (IP), transmission control protocol (TCP), user datagram protocol (UDP), file transfer protocol (FTP), and simple mail transfer protocol (SMTP). Of these we are concerned with those providing the transport and network services, TCP, UDP and IP. The relationship of these is shown in the following diagram. Figure 6.2 TCP/UDP/IP protocol relationships
Advanced considerations of distributed network protocol 167 The diagram shows that TCP and UDP each provide transport services, and each communicate with the network services provided by IP. This in turn communicates with the local network protocol, shown in this case as Ethernet (IEEE 802.3). The functions of the three protocols are discussed in the following sub-sections. Internet protocol The Internet protocol provides what is termed a datagram service. It provides a means of sending individual packets of data, called datagrams from a source to a specified destination. The source and destination addresses are carried in the datagram header as 32-bit fields. IP provides no guarantee of delivery as there are no acknowledgments, and error checking is limited to a simple checksum of the header only. The responsibility for these functions is left to higher levels. IP also provides fragmentation of data into smaller packets as required by the network over which the datagram is passing, and for reassembly of the fragments into the original datagram at the destination end. The Internet protocol service is also termed a connectionless service because no link establishment steps or monitoring of a link are involved. Each datagram is an independent single communication. Internet protocol datagrams have a header of 20–24 bytes followed by their data. They can be in theory be up to 65 K bytes, but have a recommended maximum size of 576 bytes. Transmission control protocol Transmission control protocol (TCP) provides a reliable, connection-oriented means of transmitting data from one user to another. It is designed to make use of IP to transmit datagrams to provide an error-free transmission over the underlying layers to the destination TCP layer. TCP establishes communication links between ‘sockets’ at each end. Following initialization of the link, communications may take place in both directions between each end. TCP breaks the data down into segments and passes these to IP, which in turn may fragment these into smaller datagrams. TCP has a segment header of 20–24 bytes. The segment size is determined by the lowest ‘maximum segment size’ configured at each end of the link, or at 536 bytes for a non-local IP address. User datagram protocol User Datagram Protocol (UDP) is intended to provide a means of accessing the datagram service of IP more or less directly from the transport layer. One UDP datagram translates to one IP datagram being sent, with the additional information of source and destination ports, plus a checksum. UDP does not provide the reliable delivery feature of TCP, for example if an error is detected the packet will simply be discarded. Because UDP is packet based only, it is not connection oriented as is TCP. This allows it to utilize the broadcast addressing mode of IP to send to multiple destinations simultaneously.
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Practical Modern SCADA Protocols: D
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Practical Modern SCADA Protocols: D
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Contents Preface ..................
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Contents vii 12.6 Frame reception .
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Preface ix Chapter 3: Open SCADA pr
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1 Introduction Objectives When you
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Introduction 3 Figure 1.2 PC to IED
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Introduction 5 The interconnection
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Introduction 7 a number of sub-path
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Introduction 9 The Internet protoco
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Introduction 11 Outside the utiliti
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Fundamentals of SCADA communication
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Key features of SCADA software incl
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2.2.2 Control processor unit (or CP
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2.5.2 Multi-point architecture (Mul
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2.6 Communication philosophies Fund
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Pin 8 - Data carrier detect (DCD) F
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2.7.6 Synchronous communications 2.
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The two most common modes of operat
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2.8.3 Error control/flow control Fu
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3 Open SCADA protocols DNP3 and IEC
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3.2.2 DNP 3.0 and IEC 60870 protoco
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4.2 Interoperability and open stand
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Preview of DNP3 69 The DNP3 User Gr
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Preview of DNP3 71 The capability t
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5 Fundamentals of distributed netwo
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Fundamentals of distributed network
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5.3.6 Full-duplex procedures Fundam
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The message sequences are shown in
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These rules are illustrated in the
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Freeze functions are typically used
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Page 132 and 133: Fundamentals of distributed network
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Page 169 and 170: 6.2 Interoperability between DNP3 d
Page 171 and 172: 6.3.2 Data classes and events Advan
Page 173 and 174: Recommendations: 6.3.9 Multiple obj
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Page 187 and 188: Preview of IEC 60870-5 171 7.2 Stan
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Page 197 and 198: 8.1.9 IEC 60870-5-101 1995 Fundamen
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Page 207 and 208: 8.4.5 Unbalanced and balanced trans
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Page 211 and 212: Station/link initialization, balanc
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Page 217 and 218: Function codes from secondary stati
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Page 221 and 222: The following notes apply to these
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Fundamentals of IEC 60870-5 217 Mas
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Fundamentals of IEC 60870-5 219 Qua
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Fundamentals of IEC 60870-5 221 Key
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Fundamentals of IEC 60870-5 223 SVA
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Fundamentals of IEC 60870-5 225 Key
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Fundamentals of IEC 60870-5 227 DCO
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8.6.4 Qualifier information element
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Key - QOC Qualifier of command QU Q
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Fundamentals of IEC 60870-5 233 SCQ
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Fundamentals of IEC 60870-5 235 LOF
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Fundamentals of IEC 60870-5 237 FBP
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Fundamentals of IEC 60870-5 239 In
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Fundamentals of IEC 60870-5 241 Typ
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Fundamentals of IEC 60870-5 247 Val
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Type 11 Measured, scaled value Fund
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Type 20 Packed single-point with st
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Fundamentals of IEC 60870-5 259 Pro
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Fundamentals of IEC 60870-5 267 8.7
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9.1.1 Station initialization Advanc
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9.1.2 Data acquisition Advanced con
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Advanced considerations of IEC 6087
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In Figure 9.4 the following time sy
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Basic application functions: 9.2.3
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10 Differences between DNP3 and IEC
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Data objects: Differences between D
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10.2 Which one will win? Difference
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Intelligent electronic devices (IED
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11.2.5 Communications Intelligent e
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Ethernet and TCP/IP networks 317 tr
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Ethernet and TCP/IP networks 319 Th
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Ethernet and TCP/IP networks 321 Fi
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12.2.5 10Broad36 12.2.6 1Base5 Ethe
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Ethernet and TCP/IP networks 325 si
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Ethernet and TCP/IP networks 327 As
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12.8.4 Length Ethernet and TCP/IP n
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Ethernet and TCP/IP networks 331 To
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12.11.8 Fast Ethernet Ethernet and
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12.12 TCP/IP Ethernet and TCP/IP ne
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Ethernet and TCP/IP networks 337
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Ethernet and TCP/IP networks 339 Fi
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Here follows a brief description of
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Unicast addresses Ethernet and TCP/
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The three common fields are: Ethern
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Ethernet and TCP/IP networks 347 Th
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13 Fieldbus and SCADA communication
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Fieldbus and SCADA communications s
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• Programmable logic controllers
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Three such ‘services’ are readi
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Figure 13.9 High speed Ethernet and
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14.2 UCA development UCA protocol 3
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14.3.1 Uniform communications infra
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UCA protocol 367 14.3.4 Uniform app
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14.3.5 Uniform data model UCA proto
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Figure 14.6 Device object model ove
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UCA protocol 373 An excellent refer
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Applications of DNP3 and SCADA prot
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PDS 500 Data Map Applications of DN
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16 Future developments Objectives W
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Appendix A Glossary 3GPP 10Base2 10
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Appendix A: Glossary 395 ATM Attenu
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Appendix A: Glossary 397 Capacitanc
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Appendix A: Glossary 399 Decibel (d
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Appendix A: Glossary 401 ESS Etherl
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Appendix A: Glossary 403 I/O addres
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Manchester encoding Appendix A: Glo
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Appendix A: Glossary 407 Packet PAD
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Appendix A: Glossary 409 RFI Ring R
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Appendix A: Glossary 411 TDMA TDR T
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Appendix A: Glossary 413 X.25 CCITT
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Appendix B: Implementers of DNP3 41
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Appendix B: Implementers of DNP3 41
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DNP3 device profile Appendix C: Sam
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Appendix C: Sample device profile d
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Software setup Appendix D: Practica
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Appendix D: Practicals 431 1. Set u
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Objectives • To show how a basic
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Implementation/setting up TCP/IP Cl
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Appendix D: Practicals 437 Click on
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Appendix D: Practicals 441 Now rese
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Appendix D: Practicals 443 Practica
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Appendix D: Practicals 445 This sho
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Appendix D: Practicals 447 Once you
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IMPORTANT NOTICE: Appendix D: Pract
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Appendix D: Practicals 451 (This is
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Appendix D: Practicals 453 PRACTICA
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Click on the Diags button and the f
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Appendix D: Practicals 457 The scre
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Appendix D: Practicals 459 Assume t
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Appendix D: Practicals 461 Problem
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Network Loading Assumptions Item Da
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2. IEC 60870-5-101 Packet Analysis
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3.1.1.1.1 Appendix D: Practicals 46
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Appendix D: Practicals 469 Valid Ca
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3.1.1.1.7 Type 14 INFORMATION OBJEC
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Appendix D: Practicals 473 3.1.1.1.
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Appendix D: Practicals 475 QDS Qual
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Appendix D: Practicals 477 7 6 5 4
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3.1.1.1.11 Communication 1 Appendix
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Communication 1 Answer Appendix D:
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CITECT PRACTICAL For Citect Version
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Appendix D: Practicals 485 Next cli
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Appendix D: Practicals 487 (3) Defi
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Appendix D: Practicals 489
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Appendix D: Practicals 491 (4) Crea
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Appendix D: Practicals 493 Use the
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Appendix D: Practicals 497 When fin
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Appendix D: Practicals 499 What is
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Communication 2 05640DC405001A00637
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05640DC405001A006378C6C601010200003
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Appendix D: Practicals 505 What are
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Appendix D: Practicals 507 01 01 01
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Appendix D: Practicals 509 E2 81 00
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Appendix D: Practicals 511 At fist
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Appendix D: Practicals 513 Then rem
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Appendix D: Practicals 515 The next
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Packet Interpretation Practical App
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056408C40300A200EA80C5C5171E4405641
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Appendix D: Practicals 521 Communic
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05640DC405001A006378C6C601010200003
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Appendix D: Practicals 525 What is
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01 01 01 01 01 01 01 crc:BB crc:C3
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Appendix D: Practicals 529 Read Dat
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Index 531 Carrier sense with multip
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Index 533 support for protocol, 310
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Index 535 process related, 220 bina
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Index 537 signal quality detector,
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