4-1
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
Wiring the S7-400
Chapter Overview
Section Description Page
4.1 General Rules and Regulations for Operating the S7-400 4-2
4.2 Supplying Power to Modules 4-5
4.3 Choosing the Power Supply Module 4-6
4.4 Choosing the Load Current Power Supply 4-7
4.5 Assembling an S7-400 with Process I/Os 4-8
4.6 Assembling an S7-400 with Grounded Reference Potential M 4-10
4.7 Assembling an S7-400 with Ungrounded Reference Potential
(Ungrounded Configuration)
4-11
4.8 Assembling an S7-400 with Isolated Modules 4-13
4.9 Shielding Cables 4-15
4.10 Equipotential Bonding 4-17
4.11 Protection Against Inductive Surge Voltages 4-19
4.12 Grounding 4-21
4.13 Interference-Free Configuration for Local and Remote
Connections
4-23
4.14 Wiring Rules 4-25
4.15 Setting the VAC Power Supply Module to the Line Voltage 4-27
4.16 Wiring the Power Supply Module 4-28
4.17 Wiring the Signal Modules 4-32
4.18 Wiring the Front Connector, Crimp Snap-On Terminals 4-34
4.19 Wiring the Front Connector, Screw-Type Terminals 4-35
4.20 Wiring the Front Connector, Spring-Type Terminals 4-36
4.21 Fitting the Strain Relief 4-38
4.22 Labeling a Front Connector 4-39
4.23 Fitting the Front Connector 4-41
4.24 Interconnecting the CR and ER(s) 4-44
4.25 Setting the Fan Subassembly to the Line Voltage and
Wiring It
4-46
4.26 Routing Cables Using Cable Ducts or Fan Subassemblies 4-47
4.27 Routing Cables Using Fiber-Optic Cables 4-48
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