wilamowski-b-m-irwin-j-d-industrial-communication-systems-2011

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Modbus 36-15 Modbus TCP frame MBAP header Modbus application layer PDU (APDU) Transaction identifier Protocol identifier Length Unit ID Func. code Start address Register count Byte count Data for register Data for register A3 6E 00 00 00 0B 01 10 00 01 00 02 4 E1 24 E2 48 Request (from PLC to RTU) A3 6E 00 00 00 06 01 10 00 01 00 02 Reply (from RTU to PLC) FIGURE 36.14 Example Modbus transaction between the PLC and the RTU. holding registers, this particular RTU will ignore any attempt to write to registers in this second contiguous area. Registers in this second contiguous area should therefore be considered as being “read only.” As may be seen from this table, the four digital inputs of the first DDI 3420 module are mapped onto the holding register at address 5392. The least significant 4 bits of the following register at address 5393 will contain status information (short-circuit, power failure) related to these same inputs. A Modbus master changes the outputs on the next module, the DDO 3410 with four digital outputs, by writing the desired state to the holding register at address 0001. This DDO 3410 module uses another two registers in the input area: the first (at address 5394) echoes the value stored in the register 0001, while the following (at address 5395) stores the actual status of the physical outputs. The AVI 1270 module uses the registers 5396 and 5398 to store the input voltage of each analog input, while the other two registers, at addresses 5397 and 5399, store status information (over and undervoltage errors and warnings). The AVO 1250 uses the registers at addresses 0002 and 0003 to receive the voltage values that should be applied to the analog outputs, and the registers at 5400 and 5401 store status information (over and under-voltage errors). An example of a possible exchange of Modbus message frames between the PLC and this particular RTU (functioning as Modbus server) is described in Figure 36.14. In this exchange, the PLC uses the Modbus function “Write Multiple Registers” to change the analog output values stored in registers 0002 and 0003 to the values 0xE124 and 0xE248, respectively. Note that the starting address of 0002 is sent on the wire as 0001 since this particular RTU follows the Modbus specification to the letter, and all documentation assumes that the memory areas start at address 1, which is then sent on the wire as 0. Acronyms APDU ASCII CRC EIA FIFO HMI IP LAN LRC MBAP PLC RTU SCADA TCP TIA Application layer protocol data unit American Standard Code for Information Interchange Cyclic redundancy check Electronics Industries Association First in first out Human–machine interface Internet protocol Local area network Longitudinal redundancy check Modbus application protocol Programmable logic controller Remote terminal unit Supervisory control and data acquisition Transmission control protocol Telecommunications Industry Association © 2011 by Taylor and Francis Group, LLC
36-16 Industrial Communication Systems References 1. Modbus Application Protocol Specification, v1.1b, Modbus-IDA, North Grafton, MA, December 28, 2006. 2. Modbus Messaging on TCP/IP Implementation Guide v1.0b, Modbus-IDA, North Grafton, MA, October 24, 2006. 3. Open Modbus/TCP Specification, Andy Swales, Schneider Electric SA, France, March 29, 1999. 4. MODBUS over Serial Line Specification and Implementation Guide V1.02, Modbus-IDA, North Grafton, MA, 2006. 5. Electrical Characteristics of Generators and Receivers for Use in Balanced Digital Multipoint Systems, ANSI/TIA/EIA-485-A-1998. 6. Interface Between Data Terminal Equipment and Data Circuit-Terminating Equipment Employing Serial Binary Data Interchange, ANSI/TIA/EIA-232-F-1997. © 2011 by Taylor and Francis Group, LLC
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The Industrial Electronics Handbook
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The Electrical Engineering Handbook
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CRC Press Taylor & Francis Group 60
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viii Contents 11 Industrial Strengt
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x Contents 46 Profisafe............
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Preface The field of industrial ele
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xvi Preambles Thilo Sauter Institut
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xviii Preambles are the same. Commu
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xx Preambles In order to cater to h
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xxii Preambles In this manner, it i
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Editorial Board Dietmar Bruckner Vi
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xxviii Editors J. David Irwin recei
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Contributors Teresa Albero-Albero E
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Contributors xxxiii Georg Gaderer I
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Contributors xxxv Peter Neumann Ins
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Contributors xxxvii Thomas Tamandl
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I Technical Principles 1 ISO/OSI Mo
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Technical Principles I-3 18 Clock S
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1-2 Industrial Communication System
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2 Media Herbert Schweinzer Vienna U
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Media 2-3 TABLE 2.1 Overview over S
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Media 2-5 Single ended Differential
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Media 2-7 2.2.6 Standards Numerous
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Media 2-9 2.3.3 transmitters and Re
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Media 2-11 uses light backscatterin
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Media 2-13 G 1 Maximum intensity Av
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Media 2-15 As an example, the three
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4 Routing in Wireless Networks Tere
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5 Profiles and Interoperability Ger
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6 Industrial Wireless Sensor Networ
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Industrial Wireless Sensor Networks
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16 Industrial Agent Technology Alek
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18 Clock Synchronization in Distrib
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20 Network-Based Control Josep M. F
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Network-Based Control 20-3 Thus, th
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21 Functional Safety Thomas Novak S
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Functional Safety 21-3 IEC 61508:20
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Functional Safety 21-5 safety engin
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22 Security in Industrial Communica
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23 Secure Communication Using Chaos
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24 Embedded Networks in Civilian Ai
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25 Process Automation Alois Zoitl V
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26 Building and Home Automation Wol
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27 Industrial Multimedia Javier Sil
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Industrial Multimedia 27-3 Multimed
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Industrial Multimedia 27-5 FIGURE 2
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Industrial Multimedia 27-7 which wo
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Industrial Multimedia 27-9 is neces
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Industrial Multimedia 27-11 with pr
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Industrial Multimedia 27-13 [WIF01]
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28 Industrial Wireless Communicatio
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Industrial Wireless Communications
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29 Protocols in Power Generation Tu
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30 Communications in Medical Applic
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III Technologies 31 Controller Area
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Technologies III-3 53 WirelessHART,
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31 Controller Area Network Joaquim
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32 Profibus Max Felser Bern Univers
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Profibus 32-3 TABLE 32.3 Transmissi
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Profibus 32-5 32.3 Fieldbus Data Li
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Profibus 32-7 in Figure 32.3. He si
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Profibus 32-9 32.5 Cyclic Data Exch
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Profibus 32-13 [IEC84-3] IEC 61784-
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33 INTERBUS Juergen Jasperneite Ost
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Page 562 and 563: 40 PROFINET Max Felser Bern Univers
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45 LIN-Bus Andreas Grzemba Universi
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LIN-Bus 45-3 System design tool Clu
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LIN-Bus 45-5 Reverse battery protec
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LIN-Bus 45-7 times, followed by a s
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47 SafetyLon Thomas Novak SWARCO Fu
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SafetyLon 47-7 Signal output Safety
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SafetyLon 47-13 Acronyms 1oo2 COTS
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48 Wireless Local Area Networks Hen
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Wireless Local Area Networks 48-3 T
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Wireless Local Area Networks 48-5 A
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50 ZigBee Stefan Mahlknecht Vienna
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ZigBee 50-3 Wireless communication
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ZigBee 50-5 Table 50.2 Physical Cha
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ZigBee 50-7 Coordinator Router End
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51 6LoWPAN: IP for Wireless Sensor
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52 WiMAX in Industry Milos Manic Un
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WiMAX in Industry 52-5 represents a
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53 WirelessHART, ISA100.11a, and OC
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WirelessHART, ISA100.11a, and OCARI
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TABLE 54.1 Characteristics of Some
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FIGURE 55.1 CPU IN-Log IN-Num OUT-l
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START FIGURE 55.3 COLD WARM STOP E_
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START RUNSTOP COLD INIT INITO WARM
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FIGURE 55.9 Different addresses of
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EtherNet FIGURE 55.11 Device: LED1
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60 User Datagram Protocol—UDP Ale
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User Datagram Protocol—UDP 60-5 F
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User Datagram Protocol—UDP 60-7 F
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User Datagram Protocol—UDP 60-9 I
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61 Transmission Control Protocol—
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Transmission Control Protocol—TCP
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65 Semantic Web Services for Manufa
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Semantic Web Services for Manufactu
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V Outlook 67 Trends and Challenges
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68 Processing Data in Complex Commu
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