Terminating Resistor on the Bus Connector | Siemens S7-400 specification

Networking

Terminating Resistor on the Bus Connector

Terminating			Terminating
		on	resistor

resistor
		off	switched off
switched on

on off

Figure 5-3 Terminating resistor on bus connector

Terminating Resistor on the RS 485 Repeater

DC L+ M PE M 5.2

24 V

A1 B1 A1 B1

			Terminating resistor
	ON
			for bus segment 1

	ON		Terminating resistor
	SIEMENS
			for bus segment 2
	RS 485-REPEATER

	A2 B2A2 B2

Figure 5-4 Terminating resistor on RS 485 repeater

Automation System S7-400	Hardware and Installation	5-9
A5E00850741-01		5-9

Image 107

Siemens S7-400 installation manual Terminating Resistor on the Bus Connector, Terminating Resistor on the RS 485 Repeater

Contents

Simatic Safety Guidelines Approvals Purpose of the ManualRequired Basic Knowledge Scope of this Manual Training Centers NavigatingRecycling and Disposal Further Support Technical Support Service & Support on the Internet Preface Contents Contents Assembling and Installing Systems Maintenance Figures Routing Equipotential Bonding Conductor and Signal Line Tables Overview of the S7-400 Features of the S7-400 Components Function Illustration S7-400 components Location of the order number and product version Example of a rating plate Section Description Chapter Overview Central Rack CR and Expansion Rack ER S7-400 InstallationIntroduction Local Connection Remote Connection Connecting the CR and ERsConnecting with a 5 V Supply Overview of the Connections Ways of Connecting Central and Expansion Racks Type of Connection Maximum Total Cable Length Rules for Connection Racks in the S7-400 System Installing the Central Rack CR and Expansion Rack ERRack No. Available Application Characteristics Slots Buses Function of the Racks Rack with I/O Bus and Communication Bus Electrical SupplyBus Communication Bus C Bus Properties Segmented CR Subdivided CR Characteristics Retaining Distances Between Devices Important Notes on InstallationMounting and Grounding the Racks Dimensions of the Racks Mounting the Rack Screw Type Explanation Connecting the Rack to the Chassis GroundMounting Screws Mounting Additional Racks 840 mm Cable duct/fan subassembly Reference Point M4 x Ungrounded configuration Grounded configurationConnection to the Reference Point Methods of Ventilation Methods of Ventilation Wall Changing the Ventilation Filter Mat Optional Shipping state Procedure Installing the Fan Subassembly Monitoring the Fan Subassembly Installing the Cable Duct Types and Dimensions of Cabinets Choosing and Setting up Cabinets with the S7-400Why Cabinets are Required Open Cabinets Closed Cabinets Removable Power Dissipation from Cabinets Example Type of Cabinet Max. Permissible Ambient Cabinet dimensionsExample of selecting the cabinet type Modules Rules for the Arrangement of ModulesArrangement of the Modules Space Requirement of the Racks Tool Installing Modules in a RackInstallation Sequence Removing the Cover Screwing the Modules in Place Attaching the Modules Fitting Slot Labels Marking the Modules with Slot LabelsSlot Number Networking Methods of Expansion and NetworkingDistributed I/Os Accessories Accessories Installing the S7-400 Addressing the S7-400 Logical Addresses Geographical and Logical AddressesAddresses Geographical Addresses Conditions for Default Addressing Default Addressing Example How to Determine the Default Address of a ModuleDefault Addresses of Digital Modules Default Addresses of Analog Modules Channel on a Digital Module How to Determine the Default Address of a Channel Channel on an Analog Module Addressing the S7-400 Wiring the S7-400 Power Supply Modules and Load Current Power Supplies Supplying Power to Modules Module Quantity +5 VDC Max. Current Consumption Choosing the Power Supply ModuleEstimating the Power Requirement Calculation Example Determining the Load Current Choosing the Load Current Power SupplyChoosing the Load Current Power Supply Load Current Power Supplies Rule Grounding the Load Current Circuits Assembling an S7-400 with Process I/OsDefinition of a Grounded Supply TN-S Network Components and Protective Measures CPU S7-400 in the Overall Installation Terminal Connection Model Assembling an S7-400 with Grounded Reference Potential MApplication Discharge of Interference Currents An S7-400 Configured with Ungrounded Reference Potential Power Supply Units Example of Ungrounded Operation Filtering the 24 VDC SupplyInsulation Monitoring Isolated Modules and Grounding Concept Assembling an S7-400 with Isolated ModulesDefinition Configuration with Isolated Modules Parallel Wiring of Digital S7-400 Outputs Device Grounding Method GroundingGround Connections Protective Ground Mode Connection of Load Voltage Connecting the Load Voltage Ground Use only Approved Components Interference-Free Configuration for Local ConnectionsInterference-Free Configuration for Remote Connections Special Cases Lines and Tools Wiring Rules Disconnecting the Power Supply Connector Wiring the Power Supply ModulePower Supply Connector Wiring the Power Supply Connector AC DC L1 L+ 11 Plugging the power supply connector Plugging In the Power Supply Connector Three Types of Front Connector Wiring the Signal Modules 12 Preparing to wire the front connector Preparing to Wire the Front Connector 13 Wiring a Front Connector with Crimp Terminals Wiring the Front Connector, Crimping 14 Wiring a Front Connector with Screw-Type Terminals Wiring the Front Connector, Screw Terminals 15 Wiring a Front Connector with Spring-Type Terminals Wiring the Front Connector, Spring-Type Terminals 16 Principle of the spring contact Principle of the spring loaded terminal Cable Ties as Strain Relief Fitting the Strain Relief Labels and Terminal Diagram Labeling a Front Connector Labels 19 shows details for fitting a label in the front connector Order Number Description How to Label S7-400 Modules Principle of a Coding Key Fitting the Front ConnectorFront Connector Coding on the Signal Modules Plugging In the Front Connector 20 Attaching the Front Connector 21 shows how to screw on the front connector Interconnecting the Interface Modules Interconnecting the CR and ERs 23 Connection Between a Send IM and Two Receive IMs Fuse Setting the Fan Subassembly to the Line VoltageWiring the Fan Subassembly Routing Fiber-Optic Cables Cable routing in cable ducts or fan subassemblies Networking Subnets Configuring a NetworkSame Configuration Configuring Communication Baud Rate FundamentalsStation = Node Segment MPI/PROFIBUS-DP Addresses Default MPI AddressesNode Device Default MPI Address Default Highest MPI Number of Nodes Maximum Number of Connections via MPI Rules for MPI AddressesPG / OP -- Module communication without MPI PG Access Rules Rules for Configuring a Network Components Data Packets in the MPI NetworkRecommendation for MPI Addresses Recommendation for PROFIBUS-DP Addresses Terminating Resistor on the RS 485 Repeater Terminating Resistor on the Bus Connector Example Terminating Resistor in the MPI Network Example of an MPI Network Example of a PROFIBUS-DP Network PROFIBUS-DP Example Using a CPU Programming device access beyond network limits Programming Device Access Beyond Network Limits Routing Longer Cable Lengths Cable LengthsSegment in the MPI Network Segment in the PROFIBUS-DP Network Lengths of Spur Lines 10 Configuration of an MPI network Rules for Laying Cables Characteristics of the PROFIBUS-DP Bus CablePROFIBUS-DP Bus Cables PROFIBUS-DP Bus Cables Appearance 6ES7972-0B.20 Bus ConnectorsPurpose of the Bus Connector Removing the Bus Connector Connecting Bus Cables to Bus Connectors 6ES7972-0B.20Connecting the Bus Connector RS 485 Repeater / Diagnostics Repeater Benefits and Areas of Application PROFIBUS-DP Network with Fiber-Optic CablesElectrical/Optical Conversion Transmission Rate Optical PROFIBUS-DP Network in Partyline Topology Profibus Optical Bus Terminal OBT Features of the Fiber-Optic Cables Cable grip Simatic NET Profibus PCF fiber-optic, standard cable Order NumbersPrerequisite Simatic NET Profibus plastic fiber-optic, standard cable Structure Accessories Order Number Laying Plastic Fiber-Optic Cable Cable LengthsMixed Use of Plastic Fiber-Optic and PCF Fiber-Optic Cable Laying PCF Fiber-Optic Cable Rules for Laying Cable Installing the Connector Adapter Networking Commissioning How to Proceed in the Case of an Error Recommended Procedure for First StartupRecommended Procedure Grounding and Chassis Ground Concept Checks Prior to Switching On for the First TimeChecks Prior to Switching On for the First Time Mounting and Wiring Modules Line Voltage Module SettingsPower Supply Module If You Then Connecting a Programming Device PG to an S7-400Connecting a Programming Device PG to an S7-400 Communication between Programming Device and CPU Switching On an S7-400 for the First TimeSwitching On an S7-400 for the First Time Switching On an H System for the First Time How to Perform a Memory Reset Resetting the CPU with the Mode Selector SwitchHow to Carry Out a Memory Reset When Should a CPU be Reset? Resetting the CPU with the Mode Selector Switch Special Case MPI Parameters What Happens in the CPU During a Memory ResetWhat Remains Following the Memory Reset Control sequence for restart warm restart / hot restart Cold, Warm, and Hot Restarts with the Mode Selector SwitchRestart warm start Hot restart What Type of Memory Card Should You Use? Inserting a Memory CardMemory Card as Load Memory Inserting a Memory Card Inserting a Backup Battery Inserting a Backup Battery OptionBackup Commissioning Commissioning Reducing the Passivation Layer Removing a Backup Battery Behavior of the CPU During Startup Starting Up a PROFIBUS-DP SubnetRequirements Starting Up Available Interface Modules Installing Interface Modules Covering Unused Submodule Slots Commissioning Maintenance Replacing the Backup Battery Replacing the Backup Battery Rules for the Care of Backup Batteries Using Backup Batteries How the S7-400 Behaves after Exchanging Modules Replacing a Power Supply ModuleInstalling a New Module Slot Numbering Removing the Module Replacing CPUsSaving the Data Installing a New Module Replacing Digital or Analog Modules Installing a Module Exchanging the Front Connector Removing the Front Connector Coding Key Changing the Fuses Changing the Fuses in the Digital ModulesModules with Fuses Check the Plant How the S7-400 Behaves after Replacing the Fuse Removing Modules / Exchanging Cables Replacing Interface ModulesHot--swapping Modules Installing a New Module Replacing the Fuse Replacing the Fuse of the Fan SubassemblyFuse Type Removing the Fans Replacing Fans in the Fan Subassembly During Operation Maintenance Replacing the Filter Frame Maintenance Exchanging the Mother Board Available Interface Submodules Installing Interface SubmodulesReplacing Interface Submodules Inserting an Interface Submodule in a CPU Assembling and Installing Systems Emergency OFF Devices General Rules and Regulations for Operating the S7-400General Basic Rules Specific Application With You Must Ensure 120/230 VAC SupplyVDC Supply Protection Against External Electrical Effects Protection against By Means Protection Against Other Electrical Effects Possible Effects of Interference Principles of System Installation for EMCDefinition EMC Radiated Interference Coupling MechanismsCapacitive Coupling Inductive Coupling Rule 3 Secure Cable Shields Five Basic Rules for Ensuring Electromagnetic CompatibilityRule 1 Large Area Grounding Rule 2 Correct Cable Routing See also Rule 4 Special EMC MeasuresRule 5 Standard Reference Potential Inactive Metal Parts Installation of Programmable Controllers for EMCGrounding of Inactive Metal Parts During Installation Ensure the following when chassis grounding Example 1 Cabinet Configuration for EMC Examples of EMC-Compatible Assembly Example 2 EMC--compliant Wall Mounting Key for example Figure A-3 shows an example of wall mounting for EMC Ensure the following for frame and wall mounting Suitable Cables Shielding CablesPurpose of the Shielding Principle of Operation Figure A-4 Mounting Cable Shields Handling the Shields Equipotential Bonding Conductor Equipotential BondingPotential Differences Assembling and Installing Systems Inside cabinets How to Read the TableCabling Inside Buildings Connect Cables for Run Ethernet Overvoltage Protection Devices Cabling Outside BuildingsRules for EMC Rules for Lightning Protection Outside Buildings Overview Lightning Protection and Overvoltage Protection Surges Effects of a Lightning Strike Figure A-6 Lightning Protection Zones of a Building Diagram of the Lightning Protection Zones Order No Additional MeasuresSer Cables for Equip transition point 0 With Dehn + Söhne Lightning Protection Element for the 24 VDC Supply Lightning Protection Element for Signal Modules Ser Cables for Equip transition point 1 2 with Order No Low-Voltage Protection Elements for 1 Ser Cables for Equip transition point Order No With Low-Voltage Protection Elements for 2 Lightning-protection zone Sample CircuitLightning-protection 0, field side zone Ser. No Components Description From fi Gure A-7 Components in figure A-7 Additional Overvoltage Protection Inductive Surge VoltageIntegrated Surge Arrester Suppression with AC-Operated Coils Suppression for DC-Operated CoilsSuppression with Diodes / Zener Diodes Risks Safety of Electronic Control EquipmentIntoduction Reliability Important Information Operation under Industrial Conditions Interference-Free Connection of MonitorsOperation under Low-Interference Conditions Shielding and Grounding under Industrial Conditions Isolated Section You will find What is ESD? Charging Electrostatic Charging of Persons Avoid Direct Contact Ensure Sufficient Grounding Bit Memory M Backup BatteryAddress Analog Module Chassis Ground ConfigurationConfiguring Central module Cyclic Interrupt Default SettingCounters Cycle time DP Slave Diagnostic BufferDiagnostic Interrupt DP Master Function Error DisplayError Response Global Data Communication Functional GroundingFunction Block FB Function Module FM Interrupt, Cyclic Hardware InterruptInstance Data Block Interface, Multipoint Manufacturer--specific interrupt Load MemoryLocal Data Logic Block Node Number MPI AddressNesting Depth Network Organization Block OB OB PriorityOperating State Operating System of the CPU Programming Device PG Parameters, StaticPriority classes Process Image Retentive Data Run-Time ErrorReference Ground Reference Potential Substitute Value Signal ModuleSlave Status interrupt System Function Block SFB System DiagnosticsTime-Delay Interrupt System Function SFC Total Current Timer TToggle switch Update interrupt Work Memory VaristorWarm Restart Watchdog interrupt Index Index Index-3 Index-4