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MULTILINK ML2400 ETHERNET COMMUNICATIONS SWITCH – INSTRUCTION MANUAL 18–1
Multilink ML2400
Ethernet Communications Switch
Chapter 18: Modbus Protocol
Digital Energy
Multilin
Modbus Protocol
18.1 Modbus Configuration
18.1.1 Overview
Modicon programmable controllers as well as other PLCs can communicate with each
other and other devices over a variety of networks. The common language used by all
Modicon controllers is the Modbus protocol. This protocol defines a message structure that
controllers recognize and use regardless of the networks over which they communicate. It
describes the process a controller uses to request access to another device, how it will
respond to requests from the other devices, and how errors will be detected and reported.
It establishes a common format for the layout and contents of message fields. The Modbus
protocol thus operates at the layer 7 of the OSI 7 layer stack. Additional information on
Modbus can be found at http://www.modbus.org
and other related sites.
RFC 1122 Requirements for Internet Hosts - Communication Layers defines how Modbus
packets can be carried over a TCP/IP transport and how Modicon controllers or other PLC
devices can communicate over a TCP/IP network. To facilitate this communications, the GE
Multilink switches allow Modbus connectivity.
As per this RFC, Modbus communications take place on TCP port 502. Please make sure the
network security devices do not block port 502. If port 502 is blocked, which is the normal
case with many firewall and other security devices, the communications between two
Modbus devices over a TCP/IP network will not succeed.
18.1.2 Command Line Interface Settings
The following command-line interface settings are available:
modbus <enable|disable>
modbus port=<port|default>
modbus device=<device|default>
show modbus
- MultiLink ML2400 1
- Ethernet Communications 1
- *1601-0220-AD* 1
- Table of Contents 3
- TOC TABLE OF CONTENTS 5
- TABLE OF CONTENTS 10
- Chapter 1: Introduction 11
- 1.2 Ordering 12
- 1.3 Specifications 13
- 1.3.3 Type Tests 15
- 1.3.4 Physical Specifications 16
- 1.3.5 Approvals and Warranty 16
- WARRANTY 17
- 1.4 Firmware Overview 18
- 1.4.3 Before Starting 19
- 1.5.1 Console Connection 20
- 1.5.2 Console Setup 20
- 1.5.3 Console Screen 21
- 1.5.7 Privilege Levels 24
- 1.5.8 User Management 24
- 1.5.9 Help 25
- 1.5.10 Exiting 27
- FIGURE 1–3: Login screen 28
- 1.6.2 Privilege Levels 29
- 1.6.3 User Management 29
- 1.6.5 Help 34
- 1.6.6 Exiting 34
- 1.7 ML2400 Firmware Updates 36
- 2.1.2 Design Aspects 42
- 2.2 Communications Modules 43
- 2.2.2 Six-port Modules 44
- 2.2.3 Eight-port Modules 44
- 754702A1.CDR 45
- 754730A1.CDR 46
- 2.3 Features and Benefits 47
- 2.3.4 Redundant Power Supply 48
- 2.4 Applications 50
- 2.4.1 Description 50
- FIGURE 2–5: VLAN application 51
- 754732A1.CDR 52
- Chapter 3: Installation 53
- 3.2 Connecting Ethernet Media 55
- 3.3 Mechanical Installation 58
- 754734A1.CDR 59
- 3.4 Electrical Installation 60
- 3.4.3 Alarm Contacts 61
- 3.5.1 Description 63
- Chapter 4: Operation 65
- 4.1.3 Address Learning 66
- 4.1.4 Status LEDs 66
- (EQ 4.1) 69
- (EQ 4.2) 69
- (EQ 4.3) 69
- 4.2 Troubleshooting 71
- Chapter 5: IP Addressing 73
- 5.2.1 DHCP and bootp 75
- 5.2.2 bootp Database 75
- 5.2.4 Using Telnet 77
- ML2400# show console 78
- 5.3 Setting Parameters 80
- 5.3.3 Date and Time 81
- 5.3.4 Network Time 82
- 5.4 System Configuration 86
- 5.4.4 Saving Configuration 92
- 5.4.5 Script File 94
- 5.4.7 Host Names 98
- 5.4.8 Erasing Configuration 99
- Kill Config option using SWM 99
- Kill Config option using CLI 101
- Name Areas affected 101
- 5.5 IPv6 103
- 5.5.3 IPv6 Addressing 104
- FIGURE 5–5: Configuring IPv6 105
- 5.5.4 Configuring IPv6 105
- Multilink ML2400 107
- 6.1.3 Port Security Feature 108
- 6.2.1 Commands 109
- 6.2.2 Allowing MAC Addresses 110
- 6.2.3 Security Logs 114
- 6.2.4 Authorized Managers 116
- 6.3.1 Commands 118
- 6.3.2 Logs 121
- 6.3.3 Authorized Managers 122
- 754714A1.CDR 126
- 802.1x switch 127
- EAPOL EAP over RADIUS 127
- 7.2.1 Commands 128
- 7.2.2 Example 130
- 7.3.1 Commands 133
- 8.1.2 TACACS+ Flow 140
- 8.1.3 TACACS+ Packet 140
- 754717A1.CDR 141
- 8.2.1 Commands 142
- 8.2.2 Example 142
- Z Save the settings 145
- 9.2.1 Commands 148
- 9.3 Port Setup 149
- 9.3.2 Flow Control 151
- 9.3.3 Back Pressure 151
- 9.3.4 Broadcast Storms 154
- 9.3.5 Link Loss Alert 156
- 9.4.1 Commands 158
- 9.4.2 Port Setup 159
- 9.4.3 Broadcast Storms 162
- Chapter 10: VLAN 165
- VLAN CHAPTER 10: VLAN 166
- FIGURE 10–3: VLAN routing 166
- CHAPTER 10: VLAN VLAN 167
- 10.1.2 Tag VLAN vs. Port VLAN 167
- 10.2.1 Description 168
- 10.2.2 Commands 168
- Software 170
- 10.4.1 Description 174
- 10.4.2 Commands 174
- 10.4.3 Example 175
- VLAN type to be Tag VLAN 176
- ML2400(tag-vlan)## 178
- (continued on next page) 178
- 10.5.1 Description 181
- 11.1.3 GVRP Operations 188
- FIGURE 11–1: GVRP operation 188
- 754722A1.CDR 189
- 11.2.1 Commands 193
- 11.2.2 GVRP Operation Notes 193
- 11.3.1 Example 195
- Chapter 12: Spanning Tree 197
- 12.2 Configuring STP 199
- ML2400(stp)## 208
- 13.2.1 Normal RSTP 212
- 13.3.1 Normal RSTP 224
- Set > STP Type menu: 233
- 14.1.3 DiffServ and QoS 236
- FIGURE 14–1: ToS and DSCP 236
- 14.1.4 IP Precedence 236
- 754726A1.CDR 237
- Data +FCS 237
- ToS byte 237
- IP precedence 237
- 14.2.1 Commands 238
- 14.2.2 Example 240
- Configuring QoS (continued) 242
- ML2400(qos)## 242
- 14.3.1 Description 243
- Chapter 15: IGMP 247
- IGMP CHAPTER 15: IGMP 248
- CHAPTER 15: IGMP IGMP 249
- 15.1.3 IP Multicast Filters 250
- 15.1.5 IGMP Support 251
- 15.2.1 Commands 252
- 15.2.2 Example 254
- 15.3.1 Example 257
- Chapter 16: SNMP 259
- SNMP CHAPTER 16: SNMP 260
- CHAPTER 16: SNMP SNMP 261
- 16.2.1 Commands 262
- 16.2.2 Example 263
- 16.3.1 Example 268
- 16.4 Configuring RMON 271
- ML2400(rmon)## exit 272
- Chapter 17: Miscellaneous 273
- Alarm relays (continued) 277
- ML2400(alarm)## 277
- ML2400(alarm)## exit 277
- 17.2 E-mail 279
- 17.2.3 Example 281
- 17.3 Statistics 282
- 17.4 Serial Connectivity 284
- 17.4.1 Description 284
- 17.5 History 285
- 17.6 Ping 286
- 17.7 Prompt 287
- 17.8 System Events 288
- 17.8.3 EnerVista Example 289
- 17.9 Command Reference 291
- 17.9.2 Configuration commands 293
- Chapter 18: Modbus Protocol 299
- For example 300
- 18.1.3 EnerVista Settings 301
- 18.2 Memory Mapping 302
- 18.2.2 Format Codes 335
- Chapter 19: Appendix 337
- Section Description 338
- APPENDIX CHAPTER 19: APPENDIX 342
- 19.2 Warranty 342
- CHAPTER I: 343
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