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Assembling and Installing Systems
A-31
Automation System S7-400 Hardware and Installation
A5E00850741-01
Suppression for DC-Operated Coils
DC-operated coils are interconnected to diodes or Zener diodes.
+
-
+
-
With diode With Zener diode
Figure A-9 Suppression for DC-Operated Coils
Suppression with Diodes / Zener Diodes
Suppression with diodes or Zener diodes exhibits the following characteristics:
• Switching overvoltages can be avoided entirely. A Zener diode has a higher
turn-off voltage.
• High turn-off delay (6 to 9 times higher than without suppressor circuits)
The Zener diode switches off more quickly than a diode circuit.
Suppression with AC-Operated Coils
AC-operated coils are suppressed with varistors or RC elements.
With varistor With RC element
~
~
~
~
Figure A-10 Suppression with AC-Operated Coils
Suppression with a varistor exhibits the following characteristics:
• The amplitude of the switching overvoltage is limited but not attenuated.
• The steepness of the surge voltage remains the same.
• Low turn-off delay.
Suppression with an RC element exhibits the following characteristics:
• The amplitude and steepness of the switching overvoltage are reduced.
• Low turn-off delay.
- A5E00850741-01 1
- Trademarks 2
- Safety Guidelines 2
- Qualified Personnel 2
- Prescribed Usage 2
- Documentation Package 3
- S7-400 Instruction List 3
- Navigating 4
- Recycling and Disposal 4
- Further Support 4
- Training Centers 4
- Technical Support 5
- Contents 7
- Product Overview 13
- S7-400 components 14
- Type label 15
- Example of a rating plate 16
- Installing the S7-400 17
- 2.1 S7-400 Installation 18
- Connecting the CR and ER(s) 19
- Connecting witha5VSupply 19
- Overview of the Connections 19
- Rules for Connection 21
- Function of the Racks 22
- Racks in the S7-400 System 22
- • Modules are not su 22
- Electrical Supply 23
- Communication Bus (C Bus) 23
- 2.3 Segmented CR 24
- 2.4 Subdivided CR 25
- Reference Manual, Chapter 1) 26
- Dimensions of the Racks 27
- Step 2: Mounting the Rack 28
- Mounting Screws 29
- 19-inch reference level 31
- Cable duct/fan subassembly 31
- Configuration 32
- 2.7 Methods of Ventilation 34
- Subassembly 36
- Shipping state 37
- Filter Mat (Optional) 37
- Procedure 38
- Blanking 39
- Why Cabinets are Required 41
- Cabinet dimensions 44
- D D D D D 45
- Installation Sequence 46
- Removing the Cover 47
- Attaching the Modules 48
- Screwing the Modules in Place 48
- Slot Number 49
- Fitting Slot Labels 49
- Distributed I/Os 50
- 2.16 Accessories 51
- Addressing the S7-400 53
- Addresses 54
- Geographical Addresses 54
- Logical Addresses 54
- The Two Stages of Addressing 54
- Default Addressing 55
- Channel on a Digital Module 58
- Channel on an Analog Module 59
- Wiring the S7-400 61
- Calculation Example 63
- Load Current Power Supplies 64
- Determining the Load Current 64
- • Otherwise: 65
- Potential (M) 67
- Application 68
- Terminal Connection Model 68
- Power Supply Units 68
- Filtering the 24 VDC Supply 69
- Insulation Monitoring 69
- 1L+ 2L+ 3L+ 72
- 4.9 Grounding 73
- • Grounded configuration 74
- • Ungrounded configuration 74
- • Grounded and ungrounded 74
- Connections 75
- Special Cases 76
- 4.11 Wiring Rules 77
- Power Supply Connector 78
- CableTiesasStrainRelief 88
- Labels and Terminal Diagram 89
- Label with blank 90
- Cutout in front connector 90
- How to Label S7-400 Modules 91
- Principle of a Coding Key 92
- Coding key 93
- Send IM Receive IM Receive IM 96
- Terminator 96
- Wiring It 97
- Cable Routing 98
- Securing Cables 98
- Shield Contact 98
- Bending Radius 98
- 5.1 Configuring a Network 100
- 5.2 Fundamentals 101
- Number of Nodes 102
- MPI/PROFIBUS-DP Addresses 102
- Default MPI Addresses 102
- Rules for MPI Addresses 103
- PG Access 104
- Components 106
- Networking 107
- Example of an MPI Network 109
- Example Using a CPU 414-2 111
- 5.4 Cable Lengths 113
- Lengths of Spur Lines 114
- 5.5 PROFIBUS-DP Bus Cables 116
- 5.6 Bus Connectors 117
- Connecting the Bus Connector 118
- Removing the Bus Connector 118
- Electrical/Optical Conversion 120
- Transmission Rate 121
- 5.8.1 Fiber-Optic Cables 122
- Order Numbers 124
- Definition 124
- Prerequisite 124
- Structure 125
- Cable Lengths 126
- Laying PCF Fiber-Optic Cable 126
- Rules for Laying Cable 127
- Commissioning 129
- Recommended Procedure 130
- Operator Control 134
- When Should a CPU be Reset? 135
- How to Perform a Memory Reset 135
- Special Case MPI Parameters 137
- Restart (warm start) 138
- Hot restart 138
- 6.7 Inserting a Memory Card 139
- Inserting a Memory Card 140
- Inserting a Backup Battery 141
- Removing a Backup Battery 144
- Introduction 145
- Requirements 145
- Starting Up 145
- 417-4 and 417-4H) 146
- Maintenance 149
- Replacing the Backup Battery 150
- Using Backup Batteries 151
- Slot Numbering 152
- Supply Modules) 152
- Installing a New Module 152
- 7.3 Replacing CPUs 153
- Installing a Module 155
- Modules with Fuses 157
- Check the Plant 157
- Changing the Fuses 157
- Hot--swapping Modules 159
- Fuse Type 161
- Replacing the Fuse 161
- Operation 162
- During Operation 164
- Exchanging the Mother Board 166
- Chapter Overview 169
- General Basic Rules 170
- Specific Application 170
- EMERGENCY OFF Devices 170
- 120/230 VAC Supply 171
- 24 VDC Supply 171
- Definition: EMC 173
- Rule 1: Large Area Grounding 175
- Rule 2: Correct Cable Routing 175
- Rule 3: Secure Cable Shields 175
- Rule 4: Special EMC Measures 176
- See also 176
- Inactive Metal Parts 177
- Key for example 1 179
- A.5 Shielding Cables 181
- Handling the Shields 182
- A.6 Equipotential Bonding 183
- A.7 Cabling Inside Buildings 185
- A.8 Cabling Outside Buildings 187
- Overview 188
- VDE 0185 T103 189
- Effects of a Lightning Strike 189
- Protection 190
- Additional Measures 191
- Sample Circuit 196
- Components in figure A-7 197
- Inductive Surge 198
- Intoduction 200
- Reliability 200
- Important Information 201
- Guidelines for Handling 205
- B.1 What is ESD? 206
- Charging 207
- Discharge Damage 208
- Glossary 209
- Hardware Interrupt 215
- Instance Data Block 215
- Interface, Multipoint 215
- Interrupt, Cyclic 215
- Isolated 215
- MPI Address 217
- Nesting Depth 217
- Node Number 217
- Non-Isolated 217
- Varistor 224
- Warm Restart 224
- Watchdog interrupt 224
- Work Memory 224
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