II - DCE FEL ČVUT v Praze

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Mechanical Configuration of an Automation System with SIMATIC S7 Ex Modules 1.9.4 Equipotential Bonding for Lightning Protection 1.9.5 Overvoltage Protection Overvoltage protection in intrinsically safe circuits 1-36 ”Internal lightning protection” covers all the additional measures which prevent the magnetic and electrical effects of the lightning current within the building to be protected. These include, in particular, the ”equipotential bonding for lightning protection” which reduces the potential differences caused by the lightning current. The principle of internal lightning protection is to incorporate in the equipotential bonding for lightning protection all the lines entering and exiting from a volume to be protected; these include, apart from all metal piping such as that for water, gas and heat, all power and information cables whose cores are connected via suitable protective devices. Since considerable, partial lightning currents can flow over such lines and must be discharged by the protective devices, they must be chosen for a suitable current carrying capacity (lightning current conductors). The efficiency of overvoltage protection devices largely depends on the connection and cable routing. If the devices are used in hazardous areas or intrinsically safe circuits, DIN VDE 0165 must be complied with. Since these overvoltage protection devices are passive modules in accordance with DIN VDE 0165, they require neither marking nor certificate of conformity in intrinsically safe circuits. However, the system installer must ensure compliance with the minimum ignition curves specified in DIN VDE 0170/0171 Part 7/05.78 EN 50020 and the maximum temperature rise. Overvoltage protection devices can be used to protect intrinsically safe circuits against overvoltages. Since these overvoltage protection devices are considered as passive modules, they do not require PTB certification. Fig. 1-16 shows how this overvoltage protection technology can be installed in an intrinsically safe circuit. Safe area Ex area Ex module Central grounding point Lightning arrester 1 Fig. 1-16 Overvoltage protection in intrinsically safe circuits Lightning arrester 2 Sensor I/O Modules with Intrinsically-Safe Signals C79000-G7076-C152-04
Mechanical Configuration of an Automation System with SIMATIC S7 Ex Modules I/O Modules with Intrinsically-Safe Signals C79000-G7076-C152-04 The discussion of safety-relevant aspects is limited to the direct comparison of the data for inductance and capacity (Tables 1-5 and 1-6). Table 1-5 Comparison of data for inductance and capacity Ex module Comparison Lightning arrester 1 Cable Lightning arrester 2 Sensor/ actuator La LBD1 +LLtg +LBD2 +Li Ca x CBD1 +CLtg +CBD2 +Ci Table 1-6 Example of the comparison of data for inductance and capacity Ex module Comparison Lightning arrester 1 Cable Lightning arrester 2 Sensor/ actuator La = 4 mH 0.5 H 50 H 0.5 mH 0.6 mH Ca = 270 nF 1 nF 10 nF 6 nF 6 nF The overvoltage protection elements described in this section are only effective if used together with external lightning protection. External lightning protection measures reduce the effects of a lightning strike. You will find suitable lightning protection elements for Ex modules in the manuals specified in the foreword. 1-37
Page 1 and 2: SIMATIC S7-300, M7-300, ET 200M Aut
Page 3 and 4: Preface Purpose of the manual Conte
Page 5 and 6: Usage and configuration Usage and c
Page 7 and 8: Contents Preface . . . . . . . . .
Page 9 and 10: 4.6 HART Analog Input Module SM 331
Page 11 and 12: 3-13 Connection of loads to a curre
Page 13 and 14: 3-11 Representation of the digitize
Page 15 and 16: Mechanical Configuration of an Auto
Page 17 and 18: Minimum thread measure Mechanical C
Page 19 and 20: Replacing Ex I/O modules Mechanical
Page 21 and 22: Wire end ferrule Fig. 1-2 Installin
Page 23 and 24: 1.3 Configuration of an S7-300 with
Page 25 and 26: 1.4 Configuration of an M7-300 with
Page 27 and 28: 1.6 Equipotential Bonding in System
Page 29 and 30: Main equipotential bonding Addition
Page 35 and 36: 1.7.4 Selecting Cables and Lines in
Page 37 and 38: Type designations for lines in acco
Page 39 and 40: Table 1-4 Siemens cables for measur
Page 43 and 44: Shielding of intrinsically safe sig
Page 45 and 46: 1.8.3 Measures to Counteract Interf
Page 49: Mechanical Configuration of an Auto
Page 55 and 56: Table 1-7 Safety measures Mechanica
Page 57 and 58: Housing Cables Terminals Protective
Page 59 and 60: Table 1-8 Working on systems to typ
Page 61 and 62: SIMATIC S7 Ex Digital Modules In th
Page 63 and 64: Wiring diagram SM 321 DI 4 x NAMUR
Page 65 and 66: Digital input SM 321; DI 4 x NAMUR
Page 67 and 68: Parameterization Default settings C
Page 69 and 70: Input delay Diagnostics Parameteriz
Page 71 and 72: Errors and corrective measures I/O
Page 73 and 74: Influence of supply voltage and ope
Page 75 and 76: Wiring diagram Notes on intrinsical
Page 77 and 78: Digital output SM 322; DO 4 x 24V/1
Page 79 and 80: Parameterization Default settings C
Page 81 and 82: Diagnostic evaluation Diagnostics o
Page 83 and 84: Interrupts Parameterizing interrupt
Page 85 and 86: Block diagram S7-300 Backplane bus
Page 87 and 88: Safety data (refer to Certificate o
Page 89 and 90: SIMATIC S7 Ex Analog Modules In thi
Page 91 and 92: 3.1.2 Analog Representation for Mea
Page 93 and 94: Current measuring ranges I/O Module
Page 95 and 96: Temperature range, standard, Pt 100
Page 97 and 98: Temperature range, standard, Ni 100
Page 99 and 100: DIN IEC 584 Temperature range type
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Temperature range type E I/O Module
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Temperature range type L I/O Module
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Temperature range type N I/O Module
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Temperature range type S I/O Module
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3.1.3 Analog Value Representation f
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Abbreviations Insulated measured va
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3.3 Connection of Thermocouples, Vo
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Internal compensation Thermocouple
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Thermocouples with direct looping-i
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Thermocouples with internal compens
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3.3.3 Connection of Resistance Ther
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I/O Modules with Intrinsically-Safe
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Connecting loads to a current outpu
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3.6.3 Parameters of Analog Modules
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Table 3-22 Parameters of the analog
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3.6.4 Diagnostics of Analog Modules
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Table 3-25 Diagnostic messages of a
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Faults and corrective measures I/O
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3.6.6 Characteristics of Analog Mod
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Influence of faults I/O Modules wit
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Wiring diagram SM 33 1 AI 8 xTC / 4
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Special feature of resistant measur
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Analog Input SM 331; AI 8 x TC/4 x
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Error limits of analog inputs for t
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3.8 Analog Input Module SM 331; AI
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Parameterization Default settings C
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Analog value formation Measuring pr
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Wiring diagram SM 3 32 AO 4 x 0/4..
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Analog output Output ranges I/O Mod
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Interference rejection, error limit
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SIMATIC S7 HART Analog Modules In t
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4.2 Introduction to HART Introducti
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Examples of HART parameters Example
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4.3 Guidelines for Installation, St
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Modifying the parameters of the fie
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4.4 Parameters of HART Analog Modul
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4.5 Diagnostics and Interrupts of H
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4.6 HART Analog Input Module SM 331
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Wiring diagram SM 3 31 AI 2 x 0/4..
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Analog value formation Measuring pr
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Default settings Wire break monitor
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SM 332; AO 2 x 0/4...20mA HART Dime
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4.8 Data Record Interface and User
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Structure of the parameter data rec
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Diagnostic data: data record 1 Note
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Structure of command data record No
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Table 4-13 HART group error display
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Structure of the diagnostic data re
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4.8.6 User Data Interface Input Are
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Certificates of Conformity In this
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A.1.1 ASEV Certificate/Switzerland
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A.2 Certificate of Conformity for D
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A.3 Certificate of Conformity for D
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A.7 KEMA Certificate of Conformity
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A.7.2 EC Declaration of Conformity
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A.8.1 EC Declaration of Conformity
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Safety Standards, FM Approval In th
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FM approval I/O Modules with Intrin
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Bibliography In this appendix I/O M
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Glossary A AS ATEX 100a B Backplane
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D Diagnostic interrupt Diagnostic b
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FM Frequency shift keying FSK G Gro
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HART transfer area HCF I Interrupt
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O OB Organization blocks P Paramete
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R Reference potential Response time
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Index Numbers 2-wire transducer, 3-
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DP master class 2, default paramete
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Interference frequency suppression,
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Range of measurement parameter bloc
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SM 332; AO 4 x 0/4...20 mA, 3-1 bas
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Siemens AG A&D AS E81 Oestliche Rhe
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II - DCE FEL ČVUT v Praze

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