Example Terminating Resistor in the MPI Network | Siemens S7-400

Networking

Example: Terminating Resistor in the MPI Network

The figure below shows where you have to connect the terminating resistor in a possible configuration for an MPI network.

S7-400	PG
	PG

S7-400	S7-400
OP	{	OP	S7-300
OP		OP	S7-300
	RS 485
{	repeater		{
{			{
	Spur line
	Programming device
{ Terminating resistor switch on
Figure 5-5 Terminating resistor on MPI network

5-10	Automation System S7-400	Hardware and Installation
5-10		A5E00850741-01

Image 108

Siemens S7-400 installation manual Example Terminating Resistor in the MPI Network, Terminating resistor on MPI network

Contents

Simatic Safety Guidelines Purpose of the Manual Required Basic KnowledgeScope of this Manual Approvals Navigating Recycling and DisposalFurther Support Training Centers Service & Support on the Internet Technical Support Preface Contents Contents Maintenance Assembling and Installing Systems Figures Routing Equipotential Bonding Conductor and Signal Line Tables Features of the S7-400 Overview of the S7-400 S7-400 components Components Function Illustration Location of the order number and product version Example of a rating plate Chapter Overview Section Description S7-400 Installation IntroductionCentral Rack CR and Expansion Rack ER Connecting the CR and ERs Connecting with a 5 V SupplyOverview of the Connections Local Connection Remote Connection Ways of Connecting Central and Expansion Racks Rules for Connection Type of Connection Maximum Total Cable Length Installing the Central Rack CR and Expansion Rack ER Rack No. Available Application Characteristics Slots BusesFunction of the Racks Racks in the S7-400 System Electrical Supply BusCommunication Bus C Bus Rack with I/O Bus and Communication Bus Segmented CR Properties Characteristics Subdivided CR Important Notes on Installation Mounting and Grounding the RacksRetaining Distances Between Devices Dimensions of the Racks Mounting the Rack Connecting the Rack to the Chassis Ground Mounting ScrewsScrew Type Explanation Mounting Additional Racks 840 mm Cable duct/fan subassembly Reference Point Ungrounded configuration Grounded configuration Connection to the Reference PointM4 x Methods of Ventilation Methods of Ventilation Wall Changing the Ventilation Shipping state Filter Mat Optional Installing the Fan Subassembly Procedure Monitoring the Fan Subassembly Installing the Cable Duct Choosing and Setting up Cabinets with the S7-400 Why Cabinets are RequiredTypes and Dimensions of Cabinets Open Cabinets Closed Cabinets Removable Power Dissipation from Cabinets Example Cabinet dimensions Example of selecting the cabinet typeType of Cabinet Max. Permissible Ambient Rules for the Arrangement of Modules Arrangement of the ModulesSpace Requirement of the Racks Modules Installing Modules in a Rack Installation SequenceTool Removing the Cover Attaching the Modules Screwing the Modules in Place Marking the Modules with Slot Labels Slot NumberFitting Slot Labels Methods of Expansion and Networking Distributed I/OsNetworking Accessories Accessories Installing the S7-400 Addressing the S7-400 Geographical and Logical Addresses AddressesGeographical Addresses Logical Addresses Default Addressing Conditions for Default Addressing How to Determine the Default Address of a Module Default Addresses of Digital ModulesExample Default Addresses of Analog Modules How to Determine the Default Address of a Channel Channel on a Digital Module Channel on an Analog Module Addressing the S7-400 Wiring the S7-400 Supplying Power to Modules Power Supply Modules and Load Current Power Supplies Choosing the Power Supply Module Estimating the Power RequirementCalculation Example Module Quantity +5 VDC Max. Current Consumption Choosing the Load Current Power Supply Choosing the Load Current Power SupplyLoad Current Power Supplies Determining the Load Current Assembling an S7-400 with Process I/Os Definition of a Grounded Supply TN-S NetworkComponents and Protective Measures Rule Grounding the Load Current Circuits S7-400 in the Overall Installation CPU Assembling an S7-400 with Grounded Reference Potential M ApplicationDischarge of Interference Currents Terminal Connection Model Power Supply Units An S7-400 Configured with Ungrounded Reference Potential Filtering the 24 VDC Supply Insulation MonitoringExample of Ungrounded Operation Assembling an S7-400 with Isolated Modules DefinitionIsolated Modules and Grounding Concept Configuration with Isolated Modules Parallel Wiring of Digital S7-400 Outputs Grounding Ground ConnectionsProtective Ground Device Grounding Method Connecting the Load Voltage Ground Mode Connection of Load Voltage Interference-Free Configuration for Local Connections Interference-Free Configuration for Remote ConnectionsUse only Approved Components Special Cases Wiring Rules Lines and Tools Wiring the Power Supply Module Power Supply ConnectorDisconnecting the Power Supply Connector Wiring the Power Supply Connector AC DC L1 L+ Plugging In the Power Supply Connector 11 Plugging the power supply connector Wiring the Signal Modules Three Types of Front Connector Preparing to Wire the Front Connector 12 Preparing to wire the front connector Wiring the Front Connector, Crimping 13 Wiring a Front Connector with Crimp Terminals Wiring the Front Connector, Screw Terminals 14 Wiring a Front Connector with Screw-Type Terminals Wiring the Front Connector, Spring-Type Terminals 15 Wiring a Front Connector with Spring-Type Terminals Principle of the spring loaded terminal 16 Principle of the spring contact Fitting the Strain Relief Cable Ties as Strain Relief Labeling a Front Connector Labels and Terminal Diagram 19 shows details for fitting a label in the front connector Labels How to Label S7-400 Modules Order Number Description Fitting the Front Connector Front Connector Coding on the Signal ModulesPlugging In the Front Connector Principle of a Coding Key 20 Attaching the Front Connector 21 shows how to screw on the front connector Interconnecting the CR and ERs Interconnecting the Interface Modules 23 Connection Between a Send IM and Two Receive IMs Setting the Fan Subassembly to the Line Voltage Wiring the Fan SubassemblyFuse Cable routing in cable ducts or fan subassemblies Routing Fiber-Optic Cables Networking Configuring a Network Same ConfigurationConfiguring Communication Subnets Fundamentals Station = NodeSegment Baud Rate Default MPI Addresses Node Device Default MPI Address Default Highest MPINumber of Nodes MPI/PROFIBUS-DP Addresses Rules for MPI Addresses PG / OP -- Module communication without MPIMaximum Number of Connections via MPI PG Access Rules for Configuring a Network Rules Data Packets in the MPI Network Recommendation for MPI AddressesRecommendation for PROFIBUS-DP Addresses Components Terminating Resistor on the Bus Connector Terminating Resistor on the RS 485 Repeater Example Terminating Resistor in the MPI Network Example of an MPI Network Example of a PROFIBUS-DP Network Example Using a CPU PROFIBUS-DP Programming Device Access Beyond Network Limits Routing Programming device access beyond network limits Cable Lengths Segment in the MPI NetworkSegment in the PROFIBUS-DP Network Longer Cable Lengths Lengths of Spur Lines 10 Configuration of an MPI network Characteristics of the PROFIBUS-DP Bus Cable PROFIBUS-DP Bus CablesPROFIBUS-DP Bus Cables Rules for Laying Cables Bus Connectors Purpose of the Bus ConnectorAppearance 6ES7972-0B.20 Connecting Bus Cables to Bus Connectors 6ES7972-0B.20 Connecting the Bus ConnectorRemoving the Bus Connector RS 485 Repeater / Diagnostics Repeater PROFIBUS-DP Network with Fiber-Optic Cables Electrical/Optical ConversionBenefits and Areas of Application Optical PROFIBUS-DP Network in Partyline Topology Transmission Rate Features of the Fiber-Optic Cables Profibus Optical Bus Terminal OBT Cable grip Order Numbers PrerequisiteSimatic NET Profibus plastic fiber-optic, standard cable Simatic NET Profibus PCF fiber-optic, standard cable Accessories Order Number Structure Cable Lengths Mixed Use of Plastic Fiber-Optic and PCF Fiber-Optic CableLaying PCF Fiber-Optic Cable Laying Plastic Fiber-Optic Cable Installing the Connector Adapter Rules for Laying Cable Networking Commissioning Recommended Procedure for First Startup Recommended ProcedureHow to Proceed in the Case of an Error Checks Prior to Switching On for the First Time Checks Prior to Switching On for the First TimeMounting and Wiring Modules Grounding and Chassis Ground Concept Module Settings Power Supply ModuleLine Voltage Connecting a Programming Device PG to an S7-400 Connecting a Programming Device PG to an S7-400If You Then Switching On an S7-400 for the First Time Switching On an S7-400 for the First TimeSwitching On an H System for the First Time Communication between Programming Device and CPU Resetting the CPU with the Mode Selector Switch How to Carry Out a Memory ResetWhen Should a CPU be Reset? How to Perform a Memory Reset Resetting the CPU with the Mode Selector Switch What Happens in the CPU During a Memory Reset What Remains Following the Memory ResetSpecial Case MPI Parameters Cold, Warm, and Hot Restarts with the Mode Selector Switch Restart warm startHot restart Control sequence for restart warm restart / hot restart Inserting a Memory Card Memory Card as Load MemoryWhat Type of Memory Card Should You Use? Inserting a Memory Card Inserting a Backup Battery Option BackupInserting a Backup Battery Commissioning Commissioning Removing a Backup Battery Reducing the Passivation Layer Starting Up a PROFIBUS-DP Subnet RequirementsStarting Up Behavior of the CPU During Startup Installing Interface Modules Available Interface Modules Covering Unused Submodule Slots Commissioning Maintenance Replacing the Backup Battery Replacing the Backup Battery Using Backup Batteries Rules for the Care of Backup Batteries Replacing a Power Supply Module Installing a New ModuleSlot Numbering How the S7-400 Behaves after Exchanging Modules Replacing CPUs Saving the DataRemoving the Module Installing a New Module Installing a Module Replacing Digital or Analog Modules Removing the Front Connector Coding Key Exchanging the Front Connector Changing the Fuses in the Digital Modules Modules with FusesCheck the Plant Changing the Fuses How the S7-400 Behaves after Replacing the Fuse Replacing Interface Modules Hot--swapping ModulesRemoving Modules / Exchanging Cables Installing a New Module Replacing the Fuse of the Fan Subassembly Fuse TypeReplacing the Fuse Replacing Fans in the Fan Subassembly During Operation Removing the Fans Maintenance Replacing the Filter Frame Maintenance Exchanging the Mother Board Installing Interface Submodules Replacing Interface SubmodulesAvailable Interface Submodules Inserting an Interface Submodule in a CPU Assembling and Installing Systems General Rules and Regulations for Operating the S7-400 General Basic RulesSpecific Application Emergency OFF Devices 120/230 VAC Supply VDC SupplyProtection Against External Electrical Effects With You Must Ensure Protection Against Other Electrical Effects Protection against By Means Principles of System Installation for EMC Definition EMCPossible Effects of Interference Coupling Mechanisms Capacitive CouplingInductive Coupling Radiated Interference Five Basic Rules for Ensuring Electromagnetic Compatibility Rule 1 Large Area GroundingRule 2 Correct Cable Routing Rule 3 Secure Cable Shields Rule 4 Special EMC Measures Rule 5 Standard Reference PotentialSee also Installation of Programmable Controllers for EMC Grounding of Inactive Metal Parts During InstallationEnsure the following when chassis grounding Inactive Metal Parts Examples of EMC-Compatible Assembly Example 1 Cabinet Configuration for EMC Key for example Example 2 EMC--compliant Wall Mounting Ensure the following for frame and wall mounting Figure A-3 shows an example of wall mounting for EMC Shielding Cables Purpose of the ShieldingPrinciple of Operation Suitable Cables Handling the Shields Figure A-4 Mounting Cable Shields Equipotential Bonding Potential DifferencesEquipotential Bonding Conductor Assembling and Installing Systems How to Read the Table Cabling Inside BuildingsConnect Cables for Run Inside cabinets Ethernet Cabling Outside Buildings Rules for EMCRules for Lightning Protection Outside Buildings Overvoltage Protection Devices Lightning Protection and Overvoltage Protection Overview Effects of a Lightning Strike Surges Diagram of the Lightning Protection Zones Figure A-6 Lightning Protection Zones of a Building Additional Measures Ser Cables for Equip transition point 0 WithOrder No Dehn + Söhne Lightning Protection Element for Signal Modules Lightning Protection Element for the 24 VDC Supply Low-Voltage Protection Elements for 1 Ser Cables for Equip transition point 1 2 with Order No Low-Voltage Protection Elements for 2 Ser Cables for Equip transition point Order No With Sample Circuit Lightning-protection 0, field side zoneLightning-protection zone Components in figure A-7 Ser. No Components Description From fi Gure A-7 Inductive Surge Voltage Integrated Surge ArresterAdditional Overvoltage Protection Suppression for DC-Operated Coils Suppression with Diodes / Zener DiodesSuppression with AC-Operated Coils Safety of Electronic Control Equipment Intoduction ReliabilityRisks Important Information Interference-Free Connection of Monitors Operation under Low-Interference ConditionsOperation under Industrial Conditions Shielding and Grounding under Industrial Conditions Isolated Section You will find What is ESD? Electrostatic Charging of Persons Charging Ensure Sufficient Grounding Avoid Direct Contact Backup Battery AddressAnalog Module Bit Memory M Configuration ConfiguringCentral module Chassis Ground Default Setting CountersCycle time Cyclic Interrupt Diagnostic Buffer Diagnostic InterruptDP Master DP Slave Error Display Error ResponseFunction Functional Grounding Function Block FBFunction Module FM Global Data Communication Hardware Interrupt Instance Data BlockInterface, Multipoint Interrupt, Cyclic Load Memory Local DataLogic Block Manufacturer--specific interrupt MPI Address Nesting DepthNetwork Node Number OB Priority Operating StateOperating System of the CPU Organization Block OB Parameters, Static Priority classesProcess Image Programming Device PG Run-Time Error Reference GroundReference Potential Retentive Data Signal Module SlaveStatus interrupt Substitute Value System Diagnostics Time-Delay InterruptSystem Function SFC System Function Block SFB Timer T Toggle switchUpdate interrupt Total Current Varistor Warm RestartWatchdog interrupt Work Memory Index Index Index-3 Index-4