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SIMATIC S7 Ex Analog Modules 3.5 Connecting Loads/Actuators to the Analog Output Module SM 332; AO 4 x 0/4...20 mA Introduction Lines for analog signals Isolated analog output modules Abbreviations 3-36 The analog output modules can be used to supply loads/actuators with current. Shielded lines twisted in pairs are used for analog signals . So as to reduce interference influence . You should ground the shield of the analog lines at both ends. If there are differences in the potential between the line ends , an equipotential bonding current can flow across the shield and cause interference in the analog signals. In this case, the shield should only be grounded at one end of the line. There is no metallic connection between each of the reference points M0- ... M3- of the analog circuits and the M terminal of the CPU in the isolated analog output modules. Isolated analog output modules are used when a difference in potential UISO can occur between the reference point of the analog circuit M0- ... M3- and the M-terminal of the CPU. Take particular care to ensure that the difference in potential UISO does not exceed the permissible value. In cases where it is possible that the permissible value is exceeded, provide a connection between the terminals M0- ... M3- and the M-terminal of the CPU. The abbreviations used in Fig. 3-13 have the following significance: QI0- ... QI3-: Analog outputs current M0- ... M3-: Reference potential of analog output circuit RL: Load/actuator L+: Power supply connection 24 V DC M : Ground terminal for 24 V DC power supply UISO: Difference in potential between reference points of channels M0- ... M3- or between the channels and M- terminal of the CPU. I/O Modules with Intrinsically-Safe Signals C79000-G7076-C152-04
Connecting loads to a current output M L+ M I/O Modules with Intrinsically-Safe Signals C79000-G7076-C152-04 You must connect loads to an output current at, e.g., QI0 and the reference point M0- of the analog circuit. Fig. 3-13 shows the principle connection of loads to a current output of an isolated analog output module. Backplane 0/4...20 mA bus DAU RL CPU Ground bus Logic SIMATIC S7 Ex Analog Modules Fig. 3-13 Connection of loads to a current output of the isolated analog output module SM 332; AO 4 x 0/4...20 mA QI 0 M 0- L+ M I U ISO 3-37
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SIMATIC S7-300, M7-300, ET 200M Aut
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Preface Purpose of the manual Conte
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Usage and configuration Usage and c
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Contents Preface . . . . . . . . .
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4.6 HART Analog Input Module SM 331
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3-13 Connection of loads to a curre
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3-11 Representation of the digitize
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Mechanical Configuration of an Auto
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Minimum thread measure Mechanical C
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Replacing Ex I/O modules Mechanical
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Wire end ferrule Fig. 1-2 Installin
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1.3 Configuration of an S7-300 with
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1.4 Configuration of an M7-300 with
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1.6 Equipotential Bonding in System
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Main equipotential bonding Addition
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1.7.4 Selecting Cables and Lines in
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Type designations for lines in acco
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Table 1-4 Siemens cables for measur
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Shielding of intrinsically safe sig
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1.8.3 Measures to Counteract Interf
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Table 1-7 Safety measures Mechanica
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Housing Cables Terminals Protective
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Table 1-8 Working on systems to typ
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SIMATIC S7 Ex Digital Modules In th
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Wiring diagram SM 321 DI 4 x NAMUR
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Digital input SM 321; DI 4 x NAMUR
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Parameterization Default settings C
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Input delay Diagnostics Parameteriz
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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
Page 101 and 102: Temperature range type E I/O Module
Page 103 and 104: Temperature range type L I/O Module
Page 105 and 106: Temperature range type N I/O Module
Page 107 and 108: Temperature range type S I/O Module
Page 109 and 110: 3.1.3 Analog Value Representation f
Page 111 and 112: Abbreviations Insulated measured va
Page 113 and 114: 3.3 Connection of Thermocouples, Vo
Page 115 and 116: Internal compensation Thermocouple
Page 117 and 118: Thermocouples with direct looping-i
Page 119 and 120: Thermocouples with internal compens
Page 121 and 122: 3.3.3 Connection of Resistance Ther
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Page 127 and 128: I/O Modules with Intrinsically-Safe
Page 129 and 130: 3.6.3 Parameters of Analog Modules
Page 131 and 132: Table 3-22 Parameters of the analog
Page 133 and 134: 3.6.4 Diagnostics of Analog Modules
Page 135 and 136: Table 3-25 Diagnostic messages of a
Page 137 and 138: Faults and corrective measures I/O
Page 139 and 140: 3.6.6 Characteristics of Analog Mod
Page 141 and 142: Influence of faults I/O Modules wit
Page 143 and 144: Wiring diagram SM 33 1 AI 8 xTC / 4
Page 145 and 146: Special feature of resistant measur
Page 147 and 148: Analog Input SM 331; AI 8 x TC/4 x
Page 149 and 150: Error limits of analog inputs for t
Page 151 and 152: 3.8 Analog Input Module SM 331; AI
Page 153 and 154: Parameterization Default settings C
Page 155 and 156: Analog value formation Measuring pr
Page 157 and 158: Wiring diagram SM 3 32 AO 4 x 0/4..
Page 159 and 160: Analog output Output ranges I/O Mod
Page 161 and 162: Interference rejection, error limit
Page 163 and 164: SIMATIC S7 HART Analog Modules In t
Page 165 and 166: 4.2 Introduction to HART Introducti
Page 167 and 168: Examples of HART parameters Example
Page 169 and 170: 4.3 Guidelines for Installation, St
Page 171 and 172: Modifying the parameters of the fie
Page 173 and 174: 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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I/O Modules with Intrinsically-Safe
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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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