Moxa Technologies MGate MB3000, MGate MB3170, MGate MB3180, MGate MB3280, MGate MB3480 User Manual

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MGate MB3000 Modbus G ateway

User Manual

Sixth Edition, July 2012

www.moxa.com/product

MGate MB3000 Modbus G ateway

User’s Manual

The software described in this manual is furnished under a license agreement and may be used only in accordance

with the terms of that agreement.

Reproduction without permission is prohibited.

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MOXA is a registered trademark of Moxa Inc.

All other trademarks or registered marks in this manual belong to their respective manufacturers.

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Information in th is doc um e nt is subject to ch ange without notice an d does not represent a commitment on the part of Moxa.

Moxa provides this document “as is,” without warranty of any kind, either expressed or implied, including, but not limited to, its particular purpose. Moxa reserves the right to make improvements and/or changes to this manual, or to the products and/or the programs described in this manual, at any time.

Information provided in this manual is intended to be accurate and reliable. However, Moxa assumes no responsibility for its use, or for any infringements on the rights of third parties that may result from its use.

This product might include unintentional technical or typographical err ors. Changes are periodically made to the information herein to correct such errors, and these changes are incorporated into new editions of the publication.

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www.moxa.com/support

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Table of Contents

Chapter 1 Introduction .............................................................................................. 1-1

Overview .............................................................................................................................. 1-2

Package Checklist ................................................................................................................. 1-3

Product Features ................................................................................................................... 1-3

Chapter 2 Getting Started ......................................................................................... 2-1

Connecting Power ................................................................................................................ 2-2

Connecting Serial Devices.................................................................................................... 2-2

RS-485 Termination and Pull High/Low Resistors ...................................................... 2-3

Connecting to a Host or the Network ................................................................................... 2-3

Installing the Software .......................................................................................................... 2-3

Mounting the Unit ................................................................................................................ 2-3

Chapter 3 Hardware: MB3180 ................................................................................... 3-1

Panel Layout ......................................................................................................................... 3-2

LED Indicators ..................................................................................................................... 3-2

Dimensions ........................................................................................................................... 3-3

Jumpers ................................................................................................................................. 3-4

Pin Assignments ................................................................................................................... 3-5

DB9 (Male) ................................................................................................................... 3-5

DIN-Rail, Wall Mounting ..................................................................................................... 3-5

Specifications ....................................................................................................................... 3-6

Chapter 4 Hardware: MB3280 ................................................................................... 4-1

Panel Layout ......................................................................................................................... 4-2

LED Indicators ..................................................................................................................... 4-2

Dimensions ........................................................................................................................... 4-3

Jumpers ................................................................................................................................. 4-4

Pin Assignments ................................................................................................................... 4-5

DB9 (Male) ................................................................................................................... 4-5

DIN-Rail, Wall Mounting ..................................................................................................... 4-5

Specifications ....................................................................................................................... 4-6

Chapter 5 Hardware: MB3480 ................................................................................... 5-1

Panel Layout ......................................................................................................................... 5-2

LED Indicators ..................................................................................................................... 5-2

Dimensions ........................................................................................................................... 5-3

Jumpers ................................................................................................................................. 5-4

Pin Assignments ................................................................................................................... 5-5

DB9 (Male) ................................................................................................................... 5-5

DIN-Rail, Wall Mounting ..................................................................................................... 5-6

Specifications ....................................................................................................................... 5-7

Chapter 6 Hardware: MB3170, MB3170I................................................................... 6-1

Panel Layout ......................................................................................................................... 6-2

LED Indicators ..................................................................................................................... 6-2

Dimensions ........................................................................................................................... 6-3

Jumpers ................................................................................................................................. 6-4

Pin Assignments ................................................................................................................... 6-5

DB9 (Male) ................................................................................................................... 6-5

Terminal Block (RS-422, RS-485) ............................................................................... 6-5

Power Input, Relay Output ........................................................................................... 6-6

DIN-Rail, Wall Mounting ..................................................................................................... 6-6

Specifications ....................................................................................................................... 6-7

Chapter 7 Hardware: MB3270, MB3270I................................................................... 7-1

Panel Layout ......................................................................................................................... 7-2

LED Indicators ..................................................................................................................... 7-2

Dimensions ........................................................................................................................... 7-3

Jumpers ................................................................................................................................. 7-4

Pin Assignments ................................................................................................................... 7-5

DB9 (Male) ................................................................................................................... 7-5

Power Input, Relay Output ........................................................................................... 7-5

DIN-Rail, Wall Mounting ..................................................................................................... 7-6

Specifications ....................................................................................................................... 7-7

Chapter 8 Typical Applications ................................................................................ 8-1

Ethernet Masters with Multiple Se r ia l Sla ves....................................................................... 8-2

Serial Masters with Multiple Ethernet Slaves....................................................................... 8-2

Modbus TCP Masters with ASCII and RTU Slaves ............................................................. 8-3

Serial Master with Serial Slaves over Internet ...................................................................... 8-3

Chapter 9 Configuring the Modbus Gateway .......................................................... 9-1

Installing the Software .......................................................................................................... 9-2

Starting MGate Manager ...................................................................................................... 9-5

Change Language Settin g ............................................................................................. 9-5

Connecting to the Unit .......................................................................................................... 9-6

Broadcast Search .......................................................................................................... 9-7

Specify by IP Address .................................................................................................. 9-8

Modifying the Configuration ................................................................................................ 9-9

Configure Serial Port for RTU or ASCII, Master or Slave ......................................... 9-10

What is ProCOM? ...................................................................................................... 9-11

How to Configure ProCOM for the MGate MB3000 ................................................. 9-11

Configure IP Address and Other Network Settings .................................................... 9-14

Configure Serial Communication Parameters ............................................................ 9-16

Set up Slave ID Mapping (Smart Routing) ................................................................. 9-17

Customize Modbus Settings ....................................................................................... 9-19

Set Up Priority Control ............................................................................................... 9-21

Accessible IP .............................................................................................................. 9-22

Miscellaneous Setup ................................................................................................... 9-24

Verifying the Locatio n o f the U nit ...................................................................................... 9-25

Monitoring Modbus Activity .............................................................................................. 9-26

Open Traffic Monitor Window ................................................................................... 9-27

Filter Traffic Information ........................................................................................... 9-28

Save Log to File .......................................................................................................... 9-29

Upgrading Fir m war e .......................................................................................................... 9-30

Chapter 10 Pin Assignments .................................................................................... 10-1

DB9 (Male) ......................................................................................................................... 10-2

Terminal Block (RS-422, RS-485) ..................................................................................... 10-3

Power Input, Relay Output ................................................................................................. 10-3

Chapter 11 Case Studies .......................................................................................... 11-1

Introduction .........................................................................................................................11-2

Replace Serial Masters with Ethernet Master(s), Slave IDs are Configurable ....................11-2

Replace Serial Masters with Ethernet Master(s), Slave IDs are Fixed ................................11-3

Keep Serial Master and Add Ethernet Master(s) .................................................................11-3

Integrate Modbus RTU, ASCII, and TCP at the Same Time ...............................................11-4

Appendix A Modbus Overview ................................................................................... A-1

Introduction ......................................................................................................................... A-1

Devices are Either Masters or Slaves .................................................................................. A-1

Slaves are Identified by ID .................................................................................................. A-1

Communication is by Request and Response ...................................................................... A-2

Requests Need a Time Limit ............................................................................................... A-2

Modbus Ethernet vs. Modbus Serial .................................................................................... A-3

Integrate Mo dbus Serial and Ethernet with Gateways ......................................................... A-3

Appendix B Declaration of Conformity ...................................................................... B-1

Chapter 1 Introduction

Welcome to the MGate MB3000 line of Modbus gateways. All models feature easy integration of Modbus TCP to Modbus RTU/ASCII and feature RS-232/422/485 ports for Modbus serial communication. One, two, and four-port models are available.

This chapter is an introduction to the MGate MB3000 and includes the following sections:

 Overview  Package Checklist  Product Features

MGate MB3000 User’s Manual Hardware Reference: MB3270, MB3270I

1-2

Overview

The MGate MB3000 is a line of protocol gateways that provid es users with

 seamless integration of Ethernet and serial Modbus devices  powerful operation modes to handle almost any Modbus application  Windows utilities for easy setup and tr a ffic monitoring

Seamless integration of Ethernet and serial Modbus devices

Modbus is one of the most popular automation protocols in the world, supporting traditional RS-232/422/485 devices and recently developed Ethernet devices. Many industrial devices, such as PLCs, DCSs, HMIs, instruments, and meters, use Mo dbus as their communication stand a rd. However, the Ethernet-based Modbus protocol is so different from the original serial-based protocols that a communication gateway is needed as a bridge for integration.

In order to integ rat e Modbu s netw orks, t he MGate MB3000 includes an Ether net port an d up to f our serial ports that support RS-232, RS-422, and RS-485 communication. It automatically and intelligently translates between Modbus TCP (Ethernet) and Modbus ASCII/R TU (serial) protocols, allowing Ethernet-based PLCs to control instruments over RS-485 without additional programmi ng or effort.

Powerful operation modes to handle almost any Modbus application

With the Modbus protocol, devices must be clearly defined as either masters or slaves. Unlike other Modbus gateways, the MGate MB3000’s operation modes allow users to select master or slave operation for each serial port. Not only does the MB3000 allow Ethernet masters to control serial slaves, it also allows serial masters to control Ethernet slaves. In additio n, the advanced models (MGate MB3170) allow both Ethernet and ser ia l slaves to be controlled by both Ethernet and serial masters. On multiport models, each serial port ’s operation mode is i ndepen dent of the oth er ports, s o that one port may be configured for slave mode and another port configured for master mode.

Extra address mapping and exception parameters are provided to ensure that most situations can be handled.

Windows utilities for easy setup and traffic monitoring

A W indows utility is provided to make configuration and operation of the MGate MB3000 as easy as possible. The utility automatically connects to all available MGate MB300 0 units o n the LAN for you. Traffic monitoring functions help you troubl eshoot Modbus communication problems by tracking items such as connection status and address translation errors.

MGate MB3000 User’s Manual Hardware Reference: MB3270, MB3270I

1-3

Package Checklist

All models in the MGate MB300 0 line are shipped with the following items:

Standard Accessories

 1 MGate MB3000 Modbus gateway  Document & software CD  Quick Installation G uide  Power adaptor (MB3180 only)  Product warranty statement

Optional Accessories

 DK-35A: DIN-rail mounting kit (35 mm)  DR-4524: 45W/2A DIN-rail 24 VDC power supply with universal 85 to 264 VAC input  DR-75-24: 75W/3.2A DIN-rail 24 VDC power supply with uni ve rsal 85 to 264 VAC input  DR-120-24: 120W/5A DIN-rail 24 VDC power supply with 88 to 132 VAC/176 to 264 VAC

input by switch

NOTE: Notify your sales representative if any of the above items is missing or damaged.

Product Features

 Integration of Modbus TCP and Modbus RTU/ASCII networks  Up to 31 Modbus RTU/ASCII slaves per serial port  Up to 32 Modbus TCP connections with Modbus RTU/ASCII masters  Configuration over Et hernet with e asy-to-use Windows utility  10/100M Fast Ethernet with automatic IP setting (DHCP)  Software-selectable RS-232/485/422 communication  High speed serial interface supporting 921.6 Kbps  Up to 16 Modbus TCP masters for Modbus RTU/ASCII slaves  Automatic slave ID routing on 2 and 4-port models  ProCOM: Virtual Serial Port for flexible Modbus to Modbus TCP communication

Chapter 2 Getting Started

This chapter provides basic instructions for installing the MGate MB3000. The following topics are covered:

 Connecting Power  Connecting Serial Devices

 RS-485 Termination and Pull High/Low Resistors  Connecting to a Host or the Network  Installing the Software  Mounting the Unit

MGate MB3000 User’s Manual Getting Started

2-2

Connecting Power

The unit can be powered using the A C adaptor or by conn ecting a power source to the t erminal block, depending on the model. The follo wing instructions are for the AC adaptor:

1. Plug the connector of the power adapter into the DC-IN jack on the back of the unit.

2. Plug the power adapter into an electrical outlet.

3. Follow these instructions to connect a power source to the terminal block:

4. Loosen or remove the screws on the terminal block.

5. Connect the 12~48 VDC power line to the terminal block.

6. Tighten the connections using the screws on the terminal block. Note that the unit does not have an on/off switch. It automatically turns on when it receives power.

The PWR LED o n the top panel will glow to indicate that the unit is re c e iving power. For power terminal block pin assignments, please refer to the hardware reference chapter for your

model.

Connecting Serial Devices

The unit’s serial port(s) are located on the back panel. There are two options for connecting serial devices, depending on the serial interface:

 You may use a DB9-to-DB9 cable to connect a serial device to the unit. Plug one end of the

cable into the port on the unit’s back panel and plug the other end of the cable into the device’s serial port.

 You may make your own customized serial cable to co nnect a serial device to the unit. For the

pin assignments of the unit’s serial port, please refer to Chapter 10. This information can then be used to construct your own serial cable.

If you are connecting a RS-485 multidrop network with multiple devices, please note the following:

 All devices that are connected to a single serial port must use the same protocol (i.e., either

Modbus RTU or Modbus ASCII).

 Each master device must get its own port on the unit. If you are connecti ng a network with

both master and slave devices, the master must be connected on a separate port from the slaves. Furthermore, the master will only be able to communicate to Modbus TCP slaves, not to the ASCII or RTU slaves that are connected on a different serial port.

For serial port pin assignments, please refer to the hardware reference chapter for your model.

MGate MB3000 User’s Manual Getting Started

2-3

RS-485 Termination and Pull High/Low Resistors

In some critical RS-485 environments, you may need to add termination resistor s to prevent the reflection of serial signals. When using ter mination resistors, it is important to set the p ull high/low resistors correctly so that the electrical signal is not corrupted. For each serial port, DIP switches or jumper settings are used to set the pull high/low resistor values. For all models except the MB3180, a built-in 120 Ω termination resistor can also be enabled.

To m odify the t ermination and pull high/low resistor settings, please refer t o the h ardware referen ce chapter for your model.

ATTENTION

Do not use the 1 KΩ pull high/low setting on the MGate MB3000 when using the RS-232 interface. Doing so will degrade the RS-232 signals and reduce the effective communication distance.

Connecting to a Host or the Network

A 10/100BaseT Ethernet port is located on the unit’s front panel. This port is used for the unit’s connection to a host or Ethernet network, as follows:

 For normal operation, use a standard straight-through Ethernet cable to connect the unit to

your Modbus TCP net work.

 For initial configuration or for troubleshooting purposes, you may connect the unit directly to

a PC. In this case, use a crossover Ethernet cable to connect the unit to your PC’s Ethernet

connector. The unit’s Link LED will light up to indicate a live Ethernet connection. For advanced models (MB 3170, MB3170I, MB3270, and MB3270I), two Ethernet ports are

provided. One port can be used to connect to the network, and the other port can be used to connect to another Ethernet device.

Installing the Software

The Windows management utility is installed from the Document and Software CD. Follow the onscreen instructions after inserting the CD. For additional details, please refer to Chapter 9.

Mounting the Unit

The unit can be placed on a desktop, mounted on the wall, or mounted on a DIN-rail. The MB3180, MB3280, and MB3480 require optional attachments for DIN-rail mounti ng. For a dditional details, please refer to the hardware reference chapter for your model.

Chapter 3 Hardware: MB3180

This chapter provides hardware information for the MGate MB3180. The following topics are covered:

 Panel Layout  LED Indicators  Dimensions  Jumpers  Pin Assignments

 DB9 (Male)  DIN-Rail, Wall Mounting  Specifications

MGate MB3000 User’s Manual Hardware: MB3180

3-2

Panel Layout

LED Indicators

Name Color Function

Ready

Red

Steady on: Powe r is on and unit is booting up. Blinking: Indicates an IP conflict, or DHCP or BOOTP

server is not responding properly.

Green

Steady on: Power is on and unit is functioning normally. Blinking: U nit is responding to software Locate function.

Off Power is off, or power error condition exists.

Ethernet

Orange 10 Mbps Ethernet connection.

Green 100 Mbps Ethernet connection.

Off Ethernet cable is disconnected, or has a short.

P1 Tx/Rx

Orange Serial port is receiving data.

Green Serial port is transmitting data.

Off

No data is being transmitted or rec e ived through the serial port.

MGate MB3000 User’s Manual Hardware: MB3180

3-3

Dimensions

MGate MB3000 User’s Manual Hardware: MB3180

3-4

Jumpers

To set the pull high/low resistors to 150 KΩ, leave jumpers JP3 and JP4 open (not shorted). This is the default setting.

To set the pull high/low resistors to 1 KΩ, short jumpers JP3 and JP4 with jumper caps.

ATTENTION

Do not use the 1 KΩ pull high/low setting on the MGate MB3000 when using the RS-232 interface. Doing so will degrade the RS-232 signals and reduce the effective communication distance.

MGate MB3000 User’s Manual Hardware: MB3180

3-5

Pin Assignments

DB9 (Male)

The MGate MB3000 uses DB9 (male) serial ports to connect Modbus RTU or ASCII devices. Each port supports three serial interfaces: RS-232, RS-422, and RS-485 (both 2 and 4-wire).

Pin RS-232

RS-422

RS-485 (4W)

RS-485 (2W)

DCD

TxD-

---

RxD

TxD+

---

TxD

RxD+

Data+

DTR

RxD-

Data-

GND

DSR

---

RTS

---

CTS

---

DIN-Rail, Wall Mounting

Mounting on a DIN-rail: Attach the DIN-rail accessories and latch the unit onto the DIN-rail as

shown. The DIN-rail kit is ordered separately.

Mounting on the wall: Place two screws in the wall and slide the unit onto the screws as shown. The

head of each screw 6.5 mm or less in diameter, and the shaft should be 3 mm or less in diameter. Make sure to leave about 2 mm of space between the head and the wall.

MGate MB3000 User’s Manual Hardware: MB3180

3-6

Specifications

LAN

Ethernet

10/100 Mbps, RJ45, Auto MDI/MDIX

Protection

Built-in 1.5 KV magnetic isolation

Serial Interface

Interface

RS-232/422/485

No. of Ports

1 port

Connector Type

DB9 (male)

Signals

RS-232:

TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND

RS-422:

Tx+, Tx -, Rx+, Rx-, GND

RS-485 (2-wire):

Data+, Data-, GND

RS-485 (4-wire)

Tx+, Tx -, Rx+, Rx-, GND

Serial Line Protection

15 KV ESD for all signals

RS-485 Data Direction

Patented ADDC™

Serial Communication Parameters

Parity

None, Even, Odd, Space, Mark

Data Bits

7, 8

Stop Bits

1, 2

Flow Control

RTS/CTS, XON/XOFF

Transmission Speed

50 bps to 921.6 Kbps

Software Features

Operation Mode

RTU Slave, RTU Master, ASCII Slave, ASCII Master

Utilities

MGate Manager

Multi-Masters and Multi-Request

16 simultaneous TCP masters, 32 simultaneous requests for ea ch TCP master

Power Requirements

Power Input

12 to 48 VDC

Power Connector

Power jack

Power Consumption

200 mA@12 VDC, 60 mA@48 VDC

Environment

Operating Temperature

0 to 55°C (32 to 13 1°F), 5 to 95%RH

Storage Temperature

-20 to 85°C (-4 to 185°F), 5 to 95% RH

Warranty

Period

5 years

Chapter 4 Hardware: MB3280

This chapter provides hardware information for the MGate MB3280. The following topics are covered:

 Panel Layout  LED Indicators  Dimensions  Jumpers  Pin Assignments

 DB9 (Male)  DIN-Rail, Wall Mounting  Specifications

MGate MB3000 User’s Manual Hardware: MB3280

4-2

Panel Layout

LED Indicators

Name Color Function

Ready

Red

Steady on: Power is on and unit is booting up. Blinking: Indicates an IP conflict, or DHCP or BOOTP

server is not responding properly.

Green

Steady on: Power is on and unit is functioning normally. Blinking: Unit is responding to software Locate function.

Off Power is off, or power error condition exists.

Ethernet

Orange 10 Mbps Ethernet connection.

Green 100 Mbps Ethernet connection.

Off Ethernet cable is disconnected, or has a short.

P1 and P2

Orange Serial port is receiving data.

Green Serial port is transmitting data.

Off

No data is being transmitted or rec e ived through the serial port.

MGate MB3000 User’s Manual Hardware: MB3280

4-3

Dimensions

MGate MB3000 User’s Manual Hardware: MB3280

4-4

Jumpers

To add a 120 Ω termination resistor, set switch 3 on the port’s assigned DIP switch to ON; set switch 3 to OFF (the d e fault setting) to disable the terminatio n re sisto r.

To set the pull high/low resistors to 150 KΩ, set swi tches 1 and 2 on the port’s assigne d DIP switch to OFF. This is the default setting.

To set the pull high/low resistors to 1 KΩ, set switches 1 and 2 on the port’s assigned DI P switch to ON.

Switch 4 on the port's assigned DIP switch is reserved.

ATTENTION

Do not use the 1 KΩ pull high/low setting on the MGate MB3000 when using the RS-232 interface. Doing so will degrade the RS-232 signals and reduce the effective communication distance.

MGate MB3000 User’s Manual Hardware: MB3280

4-5

Pin Assignments

DB9 (Male)

The MGate MB3000 uses DB9 (male) serial ports to connect Modbus RTU or ASCII devices. Each port supports three serial interfaces: RS-232, RS-422, and RS-485 (both 2 and 4-wire).

Pin RS-232

RS-422

RS-485 (4W)

RS-485 (2W)

DCD

TxD-

---

RxD

TxD+

---

TxD

RxD+

Data+

DTR

RxD-

Data-

GND

DSR

---

RTS

---

CTS

---

DIN-Rail, Wall Mounting

Mounting on a DIN-rail: Attach the DIN-rail accessories and latch the unit onto the DIN-rail as

shown. The DIN-rail kit is order e d separately.

Mounting on the wall: Place two screws in the wall and slide the unit onto the screws as shown. The

head of each screw 6.5 mm or less in diameter, and the shaft should be 3 mm or less in diameter. Make sure to leave about 2 mm of space between the head and the wall.

MGate MB3000 User’s Manual Hardware: MB3280

4-6

Specifications

LAN

Ethernet

10/100 Mbps, RJ45, Auto MDI/MDIX

Protection

Built-in 1.5 KV magnetic isolation

Serial Interface

Interface

RS-232/422/485

No. of Ports

2 ports

Connector Type

DB9 (male)

Signals

RS-232:

TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND

RS-422:

Tx+, Tx -, Rx+, Rx-, GND

RS-485 (2-wire):

Data+, Data-, GND

RS-485 (4-wire)

Tx+, Tx -, Rx+, Rx-, GND

Serial Line Protection

15 KV ESD for all signals

RS-485 Data Direction

Patented ADDC™

Serial Communication Parameters

Parity

None, Even, Odd, Space, Mark

Data Bits

7, 8

Stop Bits

1, 2

Flow Control

RTS/CTS, XON/XOFF

Transmission Speed

50 bps to 921.6 Kbps

Software Features

Operation Mode

RTU Slave, RTU Master, ASCII Slave, ASCII Master

Utilities

MGate Manager

Multi-Masters and Multi-Request

16 simultaneous TCP masters, 32 simultaneous requests for ea ch TCP master

Power Requirements

Power Input

250 mA@12 VDC, 90 mA@48 VDC

Power Socket

Power jack and terminal block

Power Consumption

250 mA (max.)

Environment

Operating Temperature

0 to 55°C (32 to 13 1°F), 5 to 95%RH

Storage Temperature

-20 to 85°C (-4 to 185°F), 5 to 95% RH

Warranty

Period

5 years

Chapter 5 Hardware: MB3480

This chapter provides hardware information for the MGate MB3480. The following topics are covered:

 Panel Layout  LED Indicators  Dimensions  Jumpers  Pin Assignments

 DB9 (Male)  DIN-Rail, Wall Mounting  Specifications

MGate MB3000 User’s Manual Hardware: MB3480

5-2

Panel Layout

LED Indicators

Name Color Function

Ready

Red

Steady on: Power is on and unit is booting up. Blinking: Indicates an IP conflict, or DHCP or BOOTP

server is not responding properly.

Green

Steady on: Power is on and unit is functioning normally. Blinking: U nit is responding to software Locate function.

Off Power is off, or power error condition exists.

Ethernet

Orange 10 Mbps Ethernet connection.

Green 100 Mbps Ethernet connection.

Off Ethernet cable is disconnected, or has a short.

P1, P2 P3, P4

Orange Serial port is receiving data.

Green Serial port is transmitting data.

Off

No data is being transmitted or rec e ived through the serial port.

MGate MB3000 User’s Manual Hardware: MB3480

5-3

Dimensions

MGate MB3000 User’s Manual Hardware: MB3480

5-4

Jumpers

To add a 120 Ω termination resistor, set switch 3 on the port’s assigned DIP switch to ON; set switch 3 to OFF (the default setting) to disable the termination resistor.

To set the pull high/low resistors to 150 KΩ, set swi tches 1 an d 2 on the port’s assigne d DIP switch to OFF. This is the default setting.

T o set the pull high/low resistors to 1 KΩ, s et swit ches 1 and 2 on the port’ s assigned DIP switch to ON.

ATTENTION

Do not use the 1 KΩ pull high/low setting on the MGate MB3000 when using the RS-232 interface. Doing so will degrade the RS-232 signals and reduc e the effective communication d istance.

MGate MB3000 User’s Manual Hardware: MB3480

5-5

Pin Assignments

DB9 (Male)

The MGate MB3000 uses DB9 (male) serial ports to connect Modbus RTU or ASCII devices. Each port supports three serial interfaces: RS-232, RS-422, and RS-485 (both 2 and 4-wire).

Pin RS-232

RS-422

RS-485 (4W)

RS-485 (2W)

DCD

TxD-

---

RxD

TxD+

---

TxD

RxD+

Data+

DTR

RxD-

Data-

GND

DSR

---

RTS

---

CTS

---

MGate MB3000 User’s Manual Hardware: MB3480

5-6

DIN-Rail, Wall Mounting

Mounting on a DIN-rail: You will first need to attach the mounting plates (included) to the unit.

Attach the DIN-rail accessories to the mounting plates and latch the unit onto the DIN-

rail as shown.

The DIN-rail kit is ordered separately.

Mounting on the wall: You will first need to attach the mounting plates to the unit. Place four

screws in the wall and slide the unit onto the screws as shown.

The head of each screw should be

6 mm or less in diameter, and the shaft should be 3 mm or less in

diameter. Make sure to leave about 5 mm of space between the head and the wall.

MGate MB3000 User’s Manual Hardware: MB3480

5-7

Specifications

LAN

Ethernet

10/100 Mbps, RJ45, Auto MDI/MDIX

Protection

Built-in 1.5 KV magnetic isolation

Serial Interface

Interface

RS-232/422/485

No. of Ports

4 ports

Connector Type

DB9 (male)

Signals

RS-232:

TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND

RS-422:

Tx+, Tx -, Rx+, Rx-, GND

RS-485 (2-wire):

Data+, Data-, GND

RS-485 (4-wire)

Tx+, Tx -, Rx+, Rx-, GND

Serial Line Protection

15 KV ESD for all signals

RS-485 Data Direction

Patented ADDC™

Serial Communication Parameters

Parity

None, Even, Odd, Space, Mark

Data Bits

7, 8

Stop Bits

1, 2

Flow Control

RTS/CTS, XON/XOFF

Transmission Speed

50 bps to 921.6 Kbps

Software Features

Operation Mode

RTU Slave, RTU Master, ASCII Slave, ASCII Master

Utilities

MGate Manager

Multi-Masters and Multi-Request

16 simultaneous TCP masters, 32 simultaneous requests for ea ch TCP master

Power Requirements

Power Input

12 to 48 VDC

Power Socket

Power jack and terminal block

Power Consumption

460 mA@12 VDC, 170 mA@48 VDC

Environment

Operating Temperature

0 to 55°C (32 to 13 1°F), 5 to 95%RH

Storage Temperature

-20 to 85°C (-4 to 185°F), 5 to 95% RH

Warranty

Period

5 years

Chapter 6 Hardware: MB3170, MB3170I

This chapter provides hardware information for the MGate MB3170 and MB3170I. The following topics are covered:

 Panel Layout  LED Indicators  Dimensions  Jumpers  Pin Assignments

 DB9 (Male)

 Terminal Block (RS-422, RS-485)

 Power Input, Relay Output  DIN-Rail, Wall Mounting  Specifications

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Panel Layout

LED Indicators

Name

Color

Function

PWR1 Red

Power is being supplied to the power input.

PWR2 Red

Power is being supplied to the power input.

RDY

Red

Steady on: Power is on and unit is booting up. Blinking: Indicates an IP conflict, or DHCP or BOOTP

server is not responding properly.

Green

Steady on: Power is on and unit is functioning normally. Blinking: U nit is responding to software Locate function.

Off

Power is off, or power error condition exists.

Ethernet

Orange

10 Mbps Ethernet connection.

Green

100 Mbps Ethernet connection.

Off

Ethernet cable is disconnected, or has a short.

Orange

Serial port is receiving data.

Green

Serial port is transmitting data.

Off

No data is being transmitted or rec e ived through the serial port.

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Dimensions

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6-4

Jumpers

The DIP switches are located beneath the DIP switch panel on the side of the unit. To add a 120 Ω termination resistor, set switch 3 to ON; set switch 3 to OFF (the default setting) to

disable the termination resistor. To set the pull high/low resistors to 150 KΩ, set switches 1 and 2 to OFF. This is the default

setting. To set the pull high/low resistors to 1 KΩ, set switches 1 and 2 to ON. Switch 4 on the port’s assigned DIP switch is reserve d.

ATTENTION

Do not use the 1 KΩ pull high/low setting on the MGate MB3000 when using the RS-232 interface. Doing so will degra d e the RS-23 2 signals and reduce the effective communication distance.

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Pin Assignments

DB9 (Male)

The MGate MB3170 and MB3170I use a DB9 (male) serial port for RS-232 connections to Modbus RTU or ASCII devices.

Pin RS-232

DCD

RxD

TxD

DTR

GND

DSR

RTS

CTS

Terminal Block (RS-422, RS-485)

The MGate MB3170 and MB3170I use a terminal block connector for RS-422 and RS-485 connections t o Modbus RTU or ASCII devices.

RS-422

RS-485 (4W)

RS-485 (2W)

TxD+

---

TxD-

--- 3 RxD+

Data+

RxD-

Data-

GND

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Power Input, Relay Output

V2+

V2- V1+

V1-

Shielded

Ground

DC Power

Input 1

DC Power

Input 1

Relay

Output

Relay

Output

DC Power

Input 2

DC Power

Input 2

DIN-Rail, Wall Mounting

There are two sliders on the back of the unit for DIN-rail and wall mounting.

Mounting on a DIN-rail: Pull out the bottom slider, latch the unit onto the DIN-rail, and push the

slider back in.

Mounting on the wall: Pull out both the top and bottom sliders and align the screws accordingly.

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Specifications

LAN

Ethernet

10/100 Mbps, RJ45, Auto MDI/MDIX

Protection

Built-in 1.5 KV magnetic isolation

Serial Interface

Interface

RS-232/422/485

No. of Ports

1 port

Connector Type

DB9 (male) for RS-232, terminal block for RS-422/485

Signals

RS-232:

TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND

RS-422:

Tx+, Tx -, Rx+, Rx-, GND

RS-485 (2-wire):

Data+, Data-, GND

RS-485 (4-wire):

Tx+, Tx -, Rx+, Rx-, GND

Serial Line Protection

15 KV ESD for all signals

RS-485 Data Direction

Patented ADDC™

Serial Communication Parameters

Parity

None, Even, Odd, Space, Mark

Data Bits

7, 8

Stop Bits

1, 2

Flow Control

RTS/CTS, XON/XOFF

Transmission Speed

50 bps to 921.6 Kbps

Software Features

Operation Mode

RTU Slave, RTU Master, ASCII Slave, ASCII Master

Utilities

MGate Manager

Multi-Masters and Multi-Request

16 simultaneous TCP masters, 32 simultaneous requests for ea ch TCP master

Power Requirements

Power Input

12 to 48 VDC

Power Socket

Terminal block

Power Consumption

MB3170: 400 mA@12 VDC, 130 mA@48 VDC MB3170I: 405 mA@12 VDC, 140 mA@48 VDC

Relay Output

1 digital relay output to alarm (normal close): Current carrying capacity 1 A @ 30 VDC

Environment

Operating Temperature

0 to 55°C (32 to 13 1°F), 5 to 95%RH

-40 to 75°C (-40 to 167°F), 5 to 95%PH for “-T” models

Storage Temperature

-40 to 85°C (-40 to 185°F), 5 to 95% RH

Warranty

Period

5 years

Chapter 7 Hardware: MB3270, MB3270I

This chapter provides hardware information for the MGate MB3270 and MB3270I. The following topics are covered:

 Panel Layout  LED Indicators  Dimensions  Jumpers  Pin Assignments

 DB9 (Male)

 Power Input, Relay Output  DIN-Rail, Wall Mounting  Specifications

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Panel Layout

LED Indicators

Name

Color

Function

PWR1 Red

Power is being supplied to the power input.

PWR2 Red

Power is being supplied to the power input.

RDY

Red

Steady on: Power is on and unit is booting up. Blinking: Indicates an IP conflict, or DHCP or

BOOTP server is

not responding properly.

Green

Steady on: Power is on and unit is functioning normally. Blinking: U nit is responding to software Locate function.

Off

Power is off, or power error condition exists.

Ethernet

Orange

10 Mbps Ethernet connection.

Green

100 Mbps Ethernet connection.

Off

Ethernet cable is disconnected, or has a short.

P1, P2

Orange

Serial port is receiving data.

Green

Serial port is transmitting data.

Off

No data is being tra nsmit ted or re ceiv ed th rough the serial port.

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Dimensions

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7-4

Jumpers

The DIP switches are located beneath the DIP switch panel on the side of the unit. To add a 120 Ω termination resistor, set switch 3 on the port’s assigned DIP switch to ON; set

switch 3 to OFF (the default setting) to disable the termination resistor. To set the pull high/low resistors to 150 KΩ, set swi tches 1 an d 2 on the port’s assigne d DIP switch

to OFF. This is the default setting. To set the pull high/low resistors to 1 KΩ, set switches 1 and 2 on the port’ s assigned DIP switch to

ON. Switch 4 on the port's assigned DIP switch is reserved.

ATTENTION

Do not use the 1 KΩ pull high/low setting on the MGate MB3000 when using the RS-232 interface. Doing so will degrade the RS-232 signals and reduce the effective communication distance.

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Pin Assignments

DB9 (Male)

The MGate MB3000 uses DB9 (male) serial ports to connect Modbus RTU or ASCII devices. Each port supports three serial interfaces: RS-232, RS-422, and RS-485 (both 2 and 4-wire).

Pin RS-232

RS-422

RS-485 (4W)

RS-485 (2W)

DCD

TxD-

---

RxD

TxD+

---

TxD

RxD+

Data+

DTR

RxD-

Data-

GND

DSR

---

RTS

---

CTS

---

Power Input, Relay Output

V2+ V2-

V1+ V1-

Shielded

Ground

DC Power

Input 1

DC Power

Input 1

Relay

Output

Relay

Output

DC Power

Input 2

DC Power

Input 2

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DIN-Rail, Wall Mounting

There are two sliders on the back of the unit for DIN-rail and wall mounting.

Mounting on a DIN-rail: Pull out the bottom slider, latch the unit onto the DIN-rail, and push the

slider back in.

Mounting on the wall: Pull out both the top and bottom sliders and align the screws accordingly.

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Specifications

LAN

Ethernet

10/100 Mbps, RJ45, Auto MDI/MDIX

Protection

Built-in 1.5 KV magnetic isolation

Serial Interface

Interface

RS-232/422/485

No. of Ports

2 ports

Connector Type

DB9 (male)

Signals

RS-232:

TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND

RS-422:

Tx+, Tx -, Rx+, Rx-, GND

RS-485 (2-wire):

Data+, Data-, GND

RS-485 (4-wire):

Tx+, Tx -, Rx+, Rx-, GND

Serial Line Protection

15 KV ESD for all signals

RS-485 Data Direction

Patented ADDC™

Serial Communication Parameters

Parity

None, Even, Odd, Space, Mark

Data Bits

7, 8

Stop Bits

1, 2

Flow Control

RTS/CTS, XON/XOFF

Transmission Speed

50 bps to 921.6 Kbps

Software Features

Operation Mode

RTU Slave, RTU Master, ASCII Slave, ASCII Master

Utilities

MGate Manager

Multi-Masters and Multi-Request

16 simultaneous TCP masters, 32 simultaneous requests for ea ch TCP master

Power Requirements

Power Input

12 to 48 VDC

Power Socket

Terminal block

Power Consumption

MB3270: 410 mA@12 VDC, 145 mA@48 VDC MB3270I: 470 mA@12 VDC, 150 mA@48 VDC

Relay Output

1 digital relay output to alarm (normal close): Current carrying capacity 1 A @ 30 VDC

Environment

Operating Temperature

0 to 55°C (32 to 13 1°F), 5 to 95%RH

40 to 75°C (-40 to 167°F), 5 to 95%PH for advanced models with “-

T”

option

Storage Temperature

-40 to 85°C (-40 to 185°F), 5 to 95% RH

Warranty

Period

5 years

Chapter 8 Typical Applications

In this chapter, we introduce four typical Modbus applications.

 Ethernet Masters with Multiple Serial Slaves  Serial Masters with Multiple Ethernet Slaves  Modbus TCP Masters with ASCII and RTU Slaves  Serial Master with Serial Slaves over Internet

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8-2

Ethernet Masters with Multiple Serial Slaves

Connect all Modbus devices over an Ethernet network

Most modern PLCs and host computers support Modbus TCP over Ethernet. In order to access discrete Modbus RTU/ASCII devices for data collection and control, they can rely on the MGate MB3000 Modbus gateway.

The MGate MB3000 supports Modbus TCP with up to 16 simultaneous connections. The serial interface support s both RS-232 an d RS-422/485, selectable through software. Each serial port can be connected to one RS-232 or RS-422 serial device, or to 31 RS-485 serial devices.

Serial Masters with Multiple Ethernet Slaves

Link a serial master device with Ethernet slave devices

Many HMI (Human Machine Interface) systems use a serial interface to connect to a discrete DCS (Data Control System). However, many DCSs are n ow Ethernet-based and operate as a Modbus TCP slave device.

The MGate MB3000 Modbus gateway can link a serial-based HMI to distributed DCSs over an Ethernet network. Up to 32 Modbus TCP slave devices are supported by each MGate MB3000.

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8-3

Modbus TCP Masters with ASCII and RTU Slaves

Link TCP master devices with both ASCII and RTU serial devices simultaneously

When integrating Modb us networks, you may encounter different Modbus serial networks that use different baudrates or a different protocol. Modbus ASCII might be used by some devices, while Modbus RTU is used by other devices.

The two and four-port MGate models can integrate serial Modbus networks that use different parameters or protocols. You can configure each serial port to a specific Modbus serial environment, set up a slave ID map. After configuration, only the gateway will be visible to Modbus TCP masters, and all serial devices will be integrated behind it.

Serial Master with Serial Slaves over Internet

Let Modbus serial devices communicate over the Internet

Many Modbus devices communicate over RS-485, which lim its t h e number of devices in a network to 32 and the transmission distance to 1.2 km.

With the MGate MB3000 Modbus gateway, you can lin k all Modbus devices over a n Ethernet network. Up to 32 Modbus gateways can be installed in a single cont rol network, so each device can now be accessed from anywhere the TCP/IP network can reach.

Chapter 9 Configuring the Modbus Gateway

We discuss the following topics in this chapter:

 Installing the Softwa re  Startin g MGate Mana ger

 Change Language Settin g  Connecting to the Unit

 Broadcast Search

 Specify by IP Address  Modifying the Configuration

 Configure Serial Port for RTU or ASCII, Master or Slave

 Configure IP Address and Other Network Settings

 Configure Serial Communication Parameters

 Set up Slave ID Mapping (Smart Routing)

 Customize Modbus Settings

 Set Up Priority Control

 Accessible IP

 Miscellaneous  Verifying the Location of

the Unit

 Monitoring Modbus Activity

 Open Traffic Monitor Window

 Filter Traffic Information

 Save Log to File  Upgrading Firmware

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9-2

Installing the Software

The following instructions exp la in how to install MGate Manager, a utility for configuring and monitoring MGate MB3000 units over t he network.

1. Insert the Document and Software CD int o the CD-ROM drive. Locate and run the following

setup program to begin the installation pr ocess:

MGM_Setup_[Version]_Build_[DateTime].exe

The latest version might be named MGM_Setup_Ver1.1.0_Build_xxxxxxxx.exe, for

example:

2. You will be greeted by the Welcome window. Click Next to continue.

3. When the Select Destination Location window appears, click Next to continue. You may

change the destination directory by fir st clic king on Browse....

MGate MB3000 User’s Manual Configuring the Modbus Gateway

9-3

4. When the Select Additional T asks window appears, click Next to c ontinue. You may select

Create a desktop icon if you would like a shortcut to MGate Manager on your desktop.

5. Click Next to start copying the software files.

6. A progress bar will appear. The procedure should take only a few seconds to complete.

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7. A mes s age w ill indicate that MGat e Manager is successfully installed. You may choose to run it

immediately by selecting Launch MGate Manager.

8. You may also open MGate Manager through Start

 Programs  MGate Manager 

MGate Manager, as shown below.

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Starting MGate Manager

MGate Manager is a Windows-based utility that is used to configure the MGate MB3000. Before running MGate Manager, make sure that your PC and the MGate MB3000 are connected to

the same network. Alternatively, the MGate MB3000 may be connected directly to the PC for configuration purposes. Please refer to Chapter 2 for more details.

You may open MGate Manager from the Windows Start menu by clicking Start

 Programs 

MGate Manager

 MGate Manager. The MGate Manager window should appear as shown

below.

Change Language Setting

If you wish to run MGate Ma nager in a di fferent language , you may click Language to change the language setting. A dialog box showing the available languages should a ppear as shown below.

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9-6

When you click OK, MGate Manager will immediately reflect your chosen language.

ATTENTION

Use “Default Language” before contacting Moxa Technical Support. With support for multiple languages, MGate Manager is more user-friendly and accessible.

However, if you need assistance from Moxa Technical Support, please change the language to

“Default Language”. This will prevent any misunderstandings or confusion about MGate Manager

menu items and commands as our engineers assist you. The default language is English and will only be active for the current MGate Manager session.

When you open MGate Manager again, t he language will revert to your original setting.

Connecting to the Unit

MGate Manager needs to connect to the unit before the unit can be configured. There are two methods to connect to the unit. Broadcast Sear ch is used to find eve ry MGate MB3000 on the LAN. Search by IP attempts to connect to a spec ific unit by IP address, which is useful if the unit is located outside the LAN or can only be accessed by going through a router.

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9-7

Broadcast Search

Click Broadcast Search to begin searching the LAN for all MGate MB3000 units.

When the search is complete, every MGate MB3000 that is found on the LAN will app e a r in the window with MAC address and IP address. Simply select the one that you wish to configure.

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9-8

Specify by IP Address

Click Specify by IP Addr ess if you know the IP address of the unit and wish to conn ect to it direct ly.

A dialog box will appear. Enter the unit’s IP address and click OK.

If the search is successful, the unit will be listed in MGate Manager. Click the unit to begin configuration.

MGate MB3000 User’s Manual Configuring the Modbus Gateway

9-9

ATTENTION

If Search by IP Address fails to locate the MGate MB3000, the IP address that you entered might be incorrect. Try doing the search again and re-entering the IP address carefully.

Another possibility is that the MGate MB3000 is located on the same LAN as your PC, but on a different subnet. In this case, you can modify your PC’s IP address and/or netmask so that it is on the same subnet as the MGate MB3000. After your PC and the MGate MB3000 are on the same subnet, MGate Manager should be able to find the unit.

Modifying the Configuration

Once your unit is displayed in MGate Manager , select it by clicking on it. The Configuration button will become available. Click Configuration to open the configuration window.

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9-10

Configure Serial Port for RTU or ASCII, Master or Slave

The Mode tab is where each serial port’s operation mode is configured. The operation mode determines whether the device(s) that are connected to the serial port will operate as a master or a slave, and whether the Modbus RTU or Modbus ASCII protocol will be used. There are four operation modes as follows:

Mode

Description

RTU Slave

Modbus RTU slave(s) will be connected to the serial port.

RTU Master

A Modbus RTU master will be connected to the serial port.

ASCII Slave

Modbus ASCII slave(s) will be connected to the serial port.

ASCII Master

A Modbus ASCII master will be connected to the serial port.

 For entry-level models (MB3180, MB3280, and MB3480), Modbus TCP masters will control

Modbus RTU/ASCII slaves, and Modbus RTU/ASCII masters will control Modbus TCP slaves.

 For advanced models (MB3170, MB3270), both Modbu s TCP and Modbus RTU/ASCII masters

can control Modbus TCP and Modbus RTU/ASCII slaves.

Use the radio buttons to select the desired operation mode for each serial port on the Modbus gateway. Select the ProCOM Enable check box located in the center of the page to enable ProCOM. For detailed information, refer to the ProCOM function description in this manual.

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9-11

What is ProCOM?

ProCOM is a Moxa proprietary function that creates virtual serial ports on the MGate MB3000 Series to make Fieldbus gateway communications more versatile. This intelligent Fieldbus gateway mimics the behavior of a native serial port when transmitting data to the desired destination. PCs can use ProCOM to communicate over the Ethernet with serial devices connected to the MGate MB3000 as if they were connected to the PC’s native COM ports. This advanced feature only works with the MGate MB3x70 Series.

How to Configure ProCOM for the MGate MB3000

If your system uses remote PCs that only support COM port behavior to control remote Modbus devices, then ProCOM is the best solution for your system. Before using ProCOM, your PC needs to create virtual COM ports that connect to a specific ProCOM over an Ethernet network. B y us ing ProCOM, the MGate MB3000 will treat your PC’s COM port as if it were an additional serial port on the MGate MB3000.

To enable this function, ProCOM mapping must be completed as follows: Locate the MGate MB3000 with the search function, and then select the MGate MB3000 device that

you want to set Pr oCO M for, and then click ProCOM Mapping to enter the mapping dialog box, as illustrated by the following figure s.

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9-12

On the ProCOM mapping dialog box, you can map up to four ProCOM fun ctions for each Modb us gateway to your PC’s COM ports. The driver will generate virtaul COM ports on your PC to connect to the selected MGate MB3000s over the network.

This way, when you send a Modbus request to ProCOM, the driver will forward your request to the MGate MB3000 and then the MGate MB3000 will forward the request to the target Modbus device using the pre-set Modbus device mode and Slave ID. For example, the Modbus request from ProCOM can be redirected to a Modbus RTU/ASCII device that is behind the MGate MB3000's serial interface, or to a Modbus TCP device through the MG ate MB3000's Ethernet port. In addition, it can be redirected to another ProCOM port on the MGate MB3000.

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If you would l ike to change the COM port numbers, double click on the items as follows:

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9-14

Configure IP Address and Other Network Settings

The Network tab is where the unit’s network settings are configured. You can modify the Name, Network Config uratio n, IP Address, Netmask, Default Gatew ay, and DNS. You may also select a Password to protect the unit from unauthorized access.

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9-15

Parameter

Value

Notes

Name (an alphanumeric string)

You can enter a name to help you identif y the

unit, such as the location, function, etc.

Network

Configuration

Static IP, DHCP, BootP, or

DHCP/BootP

Select “Static IP” if you are using a fixed IP address. Select one of the other options if the IP

address is set dynamically.

IP Address

192.168.127.254

(or other 32-bit number)

The IP (Internet Protocol) address identifies the

server on the TCP/IP network.

Netmask

255.255.255.0

(or other 32-bit number)

This

identifies the server as belonging to a Class

A, B, or C network.

Gateway

0.0.0.0

(or other 32-bit number)

This is the IP address of the router that provides

network access outside the server’s LAN.

DNS1

0.0.0.0

(or other 32-bit number)

This is the IP address of the primary domain

name server.

DNS2

0.0.0.0

(or other 32-bit number)

This is the IP address of the secondary domain

name server.

Password (an alphanumeric string)

You can set a password to prevent unauthorized users from co nfiguring the unit. The password will be required when anyone atte mpts to configure the unit over the network. M odbus

operation is not affected by the password.

Confirm password

(an alphanumeric string)

Re-type the password again for confirmation.

ATTENTION

To erase an existing password, leave both the New Password and Confirm Password text input boxes blank. The password will be erased when you click OK in the bottom right corner.

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Configure Serial Communication Parameters

The Serial tab is where each serial port’s communication parameters are configured. You can configure Baud Rate, Parity, Stop Bit, Flo w Con trol, FIFO, and Interface Mode.

Parameter

Value

Interface Mode

RS-232

RS-422

RS-485, 2W

RS-485, 4W

Baud Rate

50 bps to 961200 bps

Parity

None, Odd, Even, Space, Mark

Stop Bits

1, 2

Flow Control

None, Xon/Xoff, RTS/CTS

UART FIFO

Enable, Disable

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Set up Slave ID Mapping (Smart Routing)

The Slave ID Map tab is where slave IDs are managed. The definitions on this tab determine how requests will be routed by the unit.

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How Slave IDs are Mapped on the MGate MB3000

When a Modbus master requests information from a Modbus slave, the request is addressed to the desired slave's ID, which must be unique on the network. When Modbus networks are integrated by a Modbus gateway, complications can arise if the same slave ID is being used on dif ferent netw orks. If this is not properly addres sed, a request sent to that slave ID would receive more than one response, causing communication problems.

With the MGate MB3000, this situation is addressed by using a slave ID map. While configuring the MGate, users set up a range of "virtual" slave IDs that are mapped to slave devices on a specific Modbus network. To send a request to a s lave th at is on a dif feren t Modbus network, a master would address the request to the appropriate virtual slave ID. The MGate then routes that request as specified by the slave ID map.

For example, if a TCP master needs information from an ASCII slave, it addresses the request to the correspo nding virtual slave ID as defined on the MGate's slave ID map. The MGate identifies the request as within its virtual slave ID range and forwards the request to the Modbus ASCII network, this time addressed to the device's actual slave ID.

Virtual slave IDs must not conflict with each other or with other TCP slave IDs.

ATTENTION

The MGate MB3000 will disregard any request that is not addressed to a virtual slave ID on its slave ID map. If a device has not been assigned a virtual slave ID, it will not be accessible by masters on the other side of the Modbus gateway.

With the slave ID map, smart routing is achieved for units w ith multiple serial ports. Since each virtual slave ID is routed to a specific Modbus network, requests are not broadcast over all serial ports. This keeps communication efficient and prevents devices on one port from slowing down the whole system.

How Slave ID Map is Defined

The slave ID map consists of entries (channels) that specify a range of virtual IDs, the destination, and the offset value. The offset value is used to convert the virtual ID to the actual ID.

Setting

Value

Notes

Virtual Slaves ID Range

(numeric range from

1 to 254)

This specifies the range of IDs that will be routed to the selected set of slave devices. For example, you can specify that IDs between 8 and 24 be routed to the devices on Port 3. The ID 255 is reserved for the

gateway itself

Slave ID Offset

(number between

-253 and 253)

This specifies the difference between the virtual slave ID and the actual slave ID.

If a

slave's virtual ID is 16 and the actual ID is 5, you would set the offset to -11. This offset is applied to the entire range of

virtual slave IDs.

When a serial port is set to RTU slave or ASCII slave mode, a virtual ID range will already be created for you. Simple select the entry in the table and modify the range and offset as needed. For TCP slaves, you can add an entry that assigns a range of virtual IDs to a specific IP address, using the Remote TCP Slave IP setting.

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Slave ID Map Example

Suppose you have two ASCII slave devices on port 1 assigned to slave IDs 3 and 5. The MGate will automatically create a virtual ID range for port 1, which you will need to modify. If slave IDs 3 and 5 are already in use by TCP slaves, the virtual ID range should be set to IDs that are not in use, such as 20 through 22. In that case, you would specify a slave ID offset of -17, since that is the difference between the virtual ID range and the actual slave IDs. The formula is as follows:

(Real Slave ID)

(Virtual Slave ID)

(Slave ID Offset)

3 - 20 = -17

With the slave ID map configured, a master that wants information from one of the ASCII slaves would add ress the request to slave ID 20 or 22. The MGate would identify that the request was addressed to a virtual slave ID in the slave ID map. The MGate would then forward the request to port 1, applying the -17 offset to obtain the actual ID of the desired device.

Customize Modbus Settings

The Modbus tab is where certain adjustments can be made to fine tune the communication between different Modbus networks. You can configure Initial Delay, Modbus TCP Exception, Slave

Channel, and Response Time-out.

Parameter

Value

Initial Delay

Numeric

Modbus TCP Exception

Enable or Disable

Slave Channel

Radio button

Response Time-out

Numeric

Initial Delay

Some Modbus slaves may take more time to boot up than other devices. For certain environments, this may cause the entire system to suffer fro m repea te d exceptions during the initial boo t-up. Y ou can force the MGate to wait af ter b oo tin g up b e fore s e ndi ng t he fir st request with the “Ini tia l Delay” setting.

Modbus TCP Exception

The MGate MB3000 is a protocol gateway that transparently passes requests and responses between the Ethernet and serial interfaces. In some situations, it may be necessary for the gateway to return an exception in response to a request from a Modbus TCP master. This is enabled or disabled with the “Modbus TCP Excep t ion” setting. When enabled, t he unit can return two types of exceptio n:

Exception

Conditions

Timeout

There is no response from the slave. Maybe the device is off-line

or the serial cable is broken.

Request dropped

There are two situations that will resul t in this exception: The request queue is full (32 request queue for each master)

The destinat ion ID not included in the slave ID map.

Not all Modbus TCP masters require this exception, so it is up to you to dete rmine if this setting should be enabled.

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Slave Channel and Response Timeout

According to th e Modbus standard, the time that it takes for a sl ave dev ice t o respond to a requ est is defined by the device manufacturer (please refer to Appendix A for details). Based on this response time, a master can be configured to wait a certain amount of time for a slave’s response. If no response is received within the specified time, the master will disregard the request and continue operation. This allows the Modbus system to continue operation even if a slave device is disconnected or faulty.

On the MGate MB3000, the “Response Time-out” field is used to configure ho w long the gateway will wait for a response from a Modbus A SCII or RTU slave. This field is s et independent ly for each serial port, which is selected through the “Slave Channel” field. Please refer to your device manufacturer’s documentation to manually set the response time-out.

The MGate MB3000 also provides automatic calibration of the response timeout. Instead of manually figuring out the appropriate setting, you can click “Auto Detection” to have the MGate figure out the setting for you. Once a value has been recommended, you can fine-tune it for best performance.

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ATTENTION

Please note the following regard ing automatic calibration of response ti meo uts: When automatically detecting the response timeout, the MGate will use the slave ID map to

determine which ports and which IDs to search. Make sure that you have defined the slave ID map for your system before clicking “Auto D e te c tion”.

The automatic calibration will take some time to complete. We recommend that you save this step for last and take a break as the MGate does its work.

Set Up Priority Control

The Priority Contr ol tab is where emergency requests are enabled and conf igured. This is available for advanced models only (MB3170, MB3170I, and MB3270).

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Priority control is designed for requests that are sent to Modbus RTU/ASCII slaves. Since Modbus RTU/ASCII slaves cannot handle multiple requests, the Modbus gateway must send each request individually and wait for the response before sending the next request. As requests stack up, the response time can suffer. This can cause problems for certain critical requests that require an immediate response.

With priority control, y ou can specify that certain requests are sent to the f ront of th e queue for m ore immediate response times. Priority requests can be specified by master (IP address or serial port), TCP port, or comm and type (slave ID, function code, or data). When the Modbus gateway identifies a priority request, the request will immediately be placed at the front of the queue.

To define a priority request, enable the appropriate priority scheme (i.e., Specified Masters, Specified TCP Port, or Specified Re que sts). Then, specify the parameter(s) tha t will indicate a priority request. Finally, click Add/Modify to apply this defi nitio n. ( This last step is not necessary for Specified TCP Port.)

For example, if you want all requests from 192.168.32.161 to be considered a priority request, you would follow these steps:

1. Enable Specified Masters.

2. Enter 192.168.32.161 as the IP.

3. Click Add/Modify.

Accessible IP

The MGate MB3000 uses an IP address-based filtering method to control access to itself. The Accessible IP List function allows you to add or block remote host IP addresses to prevent

unauthorized access. Access to the MGate MB3000 is controlled by IP a ddress. That is, i f a host’s IP address is in the accessible IP t able, th en th e host will be allow ed to access the MGate MB3000. The following descriptions illustrate how to configure the accessibility parameters:

• Only one host with a specific IP address can access the MGate MB3000

Enter “IP address/255.255.255.255” (e.g., “192.168.1.1/255.255.255.255”) and activate the item by selecting the checkbox.

• Hosts on a specific subnet can access the MGate MB3000

Enter “IP address/255.255.255.0” (e.g., “192.168.1.0/255.255.255.0”) and activate the item by selecting the checkbox.

• Any host can access the MGate MB3000

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Disable this function by clearing the “Enable the accessible IP list” checkbox.

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Miscellaneous Setup

This page identifies options that were not mentioned previously: Auto Relay Warning, Reset Button Protect, Web Console, and Telnet Console.

Auto Relay Warning will be triggered in the event of a power failure or whe n Ethernet links are disconnected. When a checked trigger condition occurs, the EIP3000 will open the circuit of the relay output and trigger the Fault LED to start blinking. Otherwise, the EIP3000 will short circuit the relay output.

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ATTENTION

Currently the MGate MB3180 does not support Web Console. The MGate MB3180/3280/3480 do not have relay outputs, and conseq uently do not support Auto

Relay Warning.

Verifying the Location of the Unit

If you are managing multiple MGate units, you may wonder if you are configuring the correct unit in MGate Manager. You can select a unit in MGate Manager and click Locate to make that unit’s “Ready” LED blink for a few seconds. This will tell you which physical unit corresponds with the unit that you select ed .

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Monitoring Modbus Activity

For troubleshooti ng or management purposes , y ou c an monitor the data passin g t h r ough any MGate MB3000 on the network. Da ta events will be logged as they pass through the gateway. Rather than simply echoing the data, MGate Manager presents the data in an intelligent, easily-understood format, with clearly designated fields including source, ty pe, destination, contents, and more. Events can be filtered in different ways, and the complete log can be saved to a file for later analysis.

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Open Traffic Monitor Window

Select the unit that you wish to monitor a nd c lic k Monitor to open the Traf f ic Monitor window.

In the Traffic Monitor window, click Start to begin live monitoring of the data p assing thro ugh the selected MGate MB3000 unit.

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To stop capturing the log, press the Stop button.

Filter Traffic Information

By default, all events are displayed in the traffic monitor window. MGate Manager also allows the data to be filtered so only the relevant information is displayed. The filter is select ed using the radio buttons and customized using the “Filter info” field, as follows:

Filter

Customization

Description

All

Show all traffic

Exception only

Show only exceptions

SID only

VSID=< virtual slave ID>

(e.g., “VSID=1”)

Show only traffic to and from the specified “virtual” slave ID (as

assigned in the MGate’s slave ID map)

RSID=< actual slave ID>

(e.g., “RSID=1”)

Show only traffic to and from the specified “actual” slave ID (as

assigned on the device itself)

Source only

IP=<IP address>

(e.g., “IP=192.168.1.2”)

Show only traffic sent from the

specified IP address

PORT=< MGate serial port number>

(e.g., “PORT=1”)

Show only traffic sent from the specific serial port on the MGate

Function code only

FCODE=<Modbus function code>

(e.g., “FCODE=3”)

Show only traffic for a specific

function code

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Save Log to File

To save the data log to a file, click Save. You may retrieve a saved log by clicking Load.

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Upgrading Firmware

Firmware updates for the MGate MB3000 are located at www.moxa.com. After you ha ve downloaded the new firmware onto your PC, you can use MGate Manager to write it onto your MGate MB3000. Select the desired unit from the list in MGate Manager and click Upgrade Firmware to begin the process.

The dialog boxes will guide you through the process. You will need to browse your PC for the firmware file. Make sure that it matches your model.

As the firmware is written to the unit, progress is displayed in the window.

Once the firmware has been successfully written ont o the unit, cl ick Exit to close the Upgrade Firmware window. MGate Manager will automatically execute a Broadcast Search for all MGate MB3000 units on the LAN. Your MGate should reappear in the l ist of units.

Chapter 10 Pin Assignments

We discuss the following topics in this chapter:

 DB9 (Male)  Terminal Block (RS-422, RS-485)  Power Input, Relay Output

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10-2

DB9 (Male)

The MGate MB3000 uses DB9 (male) serial ports to connect Modbus RTU or ASCII devices. Each port supports three serial interfaces: RS-232, RS-422, and RS-485 (both 2 and 4-wire).

Pin RS-232

RS-422

RS-485 (4W)

RS-485 (2W)

DCD

TxD-

---

RxD

TxD+

---

TxD

RxD+

Data+

DTR

RxD-

Data-

GND

DSR

---

RTS

---

CTS

---

MB3170, MB3170I

Pin RS-232

DCD

RxD

TxD

DTR

GND

DSR

RTS

CTS

MGate MB3000 User’s Manual Pin Assignment s

10-3

Terminal Block (RS-422, RS-485)

The MB3170 and MB3170I have a terminal block connector for RS-422 and RS-485 signals.

RS-422

RS-485 (4W)

RS-485 (2W)

TxD+

---

TxD-

---

RxD+

Data+

RxD-

Data-

GND

Power Input, Relay Output

V2+

V2- V1+

V1-

Shielded

Ground

DC Power

Input 1

DC Power

Input 1

Relay

Output

Relay

Output

DC Power

Input 2

DC Power

Input 2

Chapter 11 Case Studies

We discuss the following topics in this chapter:

 Introduction  Replace Serial Masters with Ethernet Master(s), Slave IDs are Configurable  Replace Serial Masters with Ethernet Master(s), Slave IDs are Fixed  Keep Serial Master and Add Ethernet Master(s)  Integrate Modbus RTU, ASCII, and TCP at the Same Time

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Introduction

There are many reasons a Modbus gateway might be used to integrate Modbus networks. However, every situation has its o wn requireme nts and difficulties. Users may wonder how the gateway can help or even if the gatewa y is suitable for the system.

This chapter presents some case studies to hel p guide. If y ou can n ot find the cas e the sam e as yours, it does not mean the MGate MB3000 is not suitable with you. Please contact Moxa and we will w ork it out with you.

Replace Serial Masters with Ethernet Master(s), Slave IDs are Configurable

In this scenario, the original control system consists of several serial-based systems. In each system, a serial master directly controls serial slave devices, as follo ws:

The MGate MB3000 can connect to each serial slave so Ethernet SCADA masters will be able to control them. However, since slave IDs cannot be repeated in a system, we will need to change the IDs of some of the slaves in order to integrate them into a single network, as follows:

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Replace Serial Masters with Ethernet Master(s), Slave IDs are Fixed

Some legacy Modbus slave devices have fixed IDs that cannot be changed. In order to integrate the devices into a Modbus TCP network, a multiport MGate model (MB3280, MB3270, or MB3480) can be used to assign virtual slave IDs. For more information about virtu al slave IDs , please refer to Chapter 9.

Keep Serial Master and Add Ethernet Master(s)

In this scenario, the serial control system is a direct, low-latency system. The serial master must not be replaced, but Ethernet masters will need to have access to the serial slaves for monitoring or supervision.

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An advanced multiport MGate model (MB3270) can be inserted into the serial system, with the slaves connected to one serial port and the master to another serial port. The advanced gateway allows Ethernet masters to communicate with the serial slaves, and it also provides a serial redirector function that simultaneously allo ws the ser ia l master to continue controlling the slaves.

Integrate Modbus RTU, ASCII, and TCP at the Same Time

There can be a wide range in number, type, and sophistication of devices on the factory floor. The most common devices are simple serial-based meters, which report certain information relating to factory environment or equipment. However, other Modbus serial slaves may be as complex as a manufacturing machine or a PLC controller.

When integrating these devices, there may be issues if different serial environments are used for different devices. One system may use a different baudrate than another, or may use Modbus ASCII instead of Modbu s RTU. The MGate MB300 0 a l lows the differen t M odbu s sy s t em s to be integrated into one network, regardless of the protocol or communication parameters.

Appendix A Modbus Overview

Introduction

Modbus is one of the most popular automation protocols in the world. It supports both serial and Ethernet devices. Many industrial devices, such as PLCs, DCSs, HMIs, instruments, meters, motors, and drivers, use Modbus as their communication standard.

Devices are Either Masters or Slaves

All Modbus devices are classified as either a master or a slave. Masters initiate all communication with slaves and do not communicate to other masters. Slaves are completely passive and communicate only by sending a response to a master’s request.

Slaves are Identified by ID

Each Modbus slave in a system is assigned a unique ID between 1 and 247. Whenever a master makes a request, the request must include the ID of the intended recipient. Master devices themselves have no ID.

1~247

248~255

Broadcast address

Slave individual address

Reserved

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A-2

Communication is by Request and Response

All Modbus comm unic ation is by requ est an d response. A master sends a request an d a slave sen ds a response. The master will wait for the slave’s response before sending the next request. For broadcast commands, no response is expected. This is illustrated by three scenarios as follows:

Normal

The master sends a request to the slave. The slave sends a response with the requested information.

Exception

The master sends a request to the slave. The slave may not support the command or an error is detected, so it sends an exception to the master.

Broadcast

The master sends a broadcast command, such a s a reset command. Every slave on the ne twork complies with the command, and no response is sent to the master.

Requests Need a Time Limit

The original Modbus protocol was not designed for simultaneous requests or simultaneous masters, so only one request on the network can be handled at a time. When a master sends a request to a slave, no other communication may be initiated until after the slave responds. The Modbus protocol specifies that masters use a response timeout function to identify when a slave is nonresponsive due to device or line failure. This function allows a master to give up on a request if no response is received within a certain amount of time. This is illustrated as follows:

Response Timeout

The master sends a request. The slave is unresponsive for the amount of time specified by the response timeout function. The master gives up on the request and resumes operation, allowing another request to be initiated.

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A-3

To allow for a wide range of devices, baudrates, and line conditions, actual response timeout values are left open for manufacturers to determine. This allows the Modbus protocol to accommodate a wide range of devices and systems. However, this also makes it difficult for system integrators to know what response timeout value to use during configuration, especially with older or proprietary devices.

The MGate MB3000 provides a patent-pending function that tests all attached devices and recommends a response timeout value. This function saves considerable time and effort for system integrators, and results in more accurate timeout settings.

Modbus Ethernet vs. Modbus Serial

Although Modbus is intended as an application layer messaging protocol, the data format and communication rules for Ethernet-based Modbus TCP are different from serial-based Modbus ASCII and RTU.

The major difference between the Ethernet and serial Modbus protocols is the behavior of the communication model. Modbus ASCII and RTU allow only one request on the network at a time. Once a request is sent, no other communication on the bus is allowed until the slave sends a response, or until the request times out. However, Modbus TCP allows simultaneous requests on the network, from multiple masters to multiple slaves. TCP masters cannot se nd more than one request at a time to a slave, but they can send requests to other slaves before a response is received. The Modbus TCP standard recommends that slaves be able to queue up to 16 requests at a time. The MGate MB3000 will queue up to 32 requests from each TCP master, for up to 16 TCP masters.

Integrate Modbus Serial and Ethernet with Gateways

Ordinarily, Modbus TCP and Modbus ASCII/RTU are unable to communicate with each other. However, with a Modbus gateway in between the Modbus serial network and the Modbus Ethernet network, TCP masters are able to communicate with serial slaves and serial masters are able to communicate with TCP slaves.

Appendix B Declaration of Conformity

Manufacturer’s Name:

Moxa Technologies Co., Ltd.

Manufacturer’s Address:

Fl.4, No.135, Lane 235, Pao-Chiao Rd., Shing Tien City, Taipei, Taiwan, R.O.C.

Declares that the product:

Product Name:

MGate MB3000 series

Model Number:

MGate MB3180 MGate

MB3280

MGate MB3480 MGate MB3170 MGate MB3170

MGate MB3270 MGate MB3270I

Conforms to the following standards:

EMC:

FCC Class B

EN55022:1998 class B EN61000

-3-2:1995 class B

EN61000

-3-3:1995

EN55082

-1:1997

EN61000-4-2:1995

Contact Discharge 4 KV, Air Discharge 8 KV

EN61000-4-3:1995 EN61000-4-4:1995

AC/DC Power supp ly 1 KV, Data/Signal lines 5 KV

EN61000-4-5:1995

AC/DC Line to Line 1 KV, AC/DC Line to Earth 2 KV

EN61000-4-6:1995 EN61000-4-8:1993

3 A/m at 50 Hz

EN61000-4-11:1994

Safety:

UC/CUL, TUV

EN60950

Moxa Technologies MGate MB3000, MGate MB3170, MGate MB3180, MGate MB3280, MGate MB3480 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual