AutomationDirect MB-GATEWAY User Manual

MB-GATEWAY

Hardware User Manual

Manual Number: MB-GATEWAY-USER-M

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Copyright 2011-2020, Automationdirect.com® Incorporated

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Gracias por comprar equipo de automatización de Automationdirect.com®. Deseamos que su nuevo equipo
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publicación (y cualquier otra publicación pertinente) antes de instalar u operar el equipo.

Para reducir al mínimo el riesgo debido a problemas de seguridad, debe seguir todos los códigos de seguridad
locales o nacionales aplicables que regulan la instalación y operación de su equipo. Estos códigos varian de
área en área y usualmente cambian con el tiempo. Es su responsabilidad determinar cuales códigos deben ser
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Como mínimo, debe seguir las secciones aplicables del Código Nacional de Incendio, Código Nacional Eléctrico,
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Nuestros productos no son tolerantes a fallas y no han sido diseñados, fabricados o intencionados para uso
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Condiciones de nuestro catálogo. Si tiene alguna pregunta sobre instalación u operación de este equipo, o
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~ AVERTISSEMENT ~

Nous vous remercions d’avoir acheté l’équipement d’automatisation de Automationdirect.com®, en faisant des
affaires comme, AutomationDirect. Nous tenons à ce que votre nouvel équipement d’automatisation fonctionne en
toute sécurité. Toute personne qui installe ou utilise cet équipement doit lire la présente publication (et toutes les
autres publications pertinentes) avant de l’installer ou de l’utiliser.

Afin de réduire au minimum le risque d’éventuels problèmes de sécurité, vous devez respecter tous les codes locaux
et nationaux applicables régissant l’installation et le fonctionnement de votre équipement. Ces codes diffèrent d’une
région à l’autre et, habituellement, évoluent au fil du temps. Il vous incombe de déterminer les codes à respecter et
de vous assurer que l’équipement, l’installation et le fonctionnement sont conformes aux exigences de la version la
plus récente de ces codes.

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770-844-4200.

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Copyright 2011-2020, Automationdirect.com® Incorporated

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Tous droits réservés

MB-GATEWAY

HARDWARE USER MANUAL

Please include the Manual Number and the Manual Issue, both shown below,
when communicating with Technical Support regarding this publication.

Manual Number: MB-GATEWAY-USER-M

Issue: 1st Edition Rev. H

Issue Date: 02/2021

Publication History

Issue Date Description of Changes

1st Edition 06/11 Original issue

Rev. A 01/12 Added Example 4 to Appendix
Rev. B 07/12 Added IP address reset note.
Rev. C 10/13

Rev. D 02/16 Revised product photo

Rev E 09/17 Several minor revisions

Rev F 10/18 Minor revision to Appendix A, Application Examples
Rev G 02/20 Added Appendix C, Security Considerations for Control Systems Networks
Rev H 02/21 Added failsafe receiver to feature list

Added Autodetection notes. Added TCP to RTU diagrams.

Table of ConTenTs

Chapter 1: Getting Started

Introduction .................................................................................................................. 1-2

Overview of this Publication ���������������������������������������������������������������������������������������� 1-2
Who Should Read This Manual ������������������������������������������������������������������������������������1-3
Technical Support �������������������������������������������������������������������������������������������������������1-3

Conventions Used ......................................................................................................... 1-4

Key Topics for Each Chapter ��������������������������������������������������������������������������������������1-4

Product Overview ......................................................................................................... 1-5

What’s in the Box ......................................................................................................... 1-6

Mounting / Clearance Information ..............................................................................1-6

Direct Mounting����������������������������������������������������������������������������������������������������������1-6
DIN Rail Mounting ������������������������������������������������������������������������������������������������������ 1-7

Agency Approvals ......................................................................................................... 1-7

Chapter 2: Specifications

Specifications ................................................................................................................ 2-2

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

STA �����������������������������������������������������������������������������������������������������������������������������2-3
SPD ����������������������������������������������������������������������������������������������������������������������������� 2-3
TXD�����������������������������������������������������������������������������������������������������������������������������2-3
ERR ������������������������������������������������������������������������������������������������������������������������������2-3
LK/A ���������������������������������������������������������������������������������������������������������������������������� 2-4
RXD�����������������������������������������������������������������������������������������������������������������������������2-4

Dip Switch Information ................................................................................................ 2-5

Dimensional Drawing ................................................................................................... 2-6

Inches [mm] ���������������������������������������������������������������������������������������������������������������� 2-6

Table of Contents

Chapter 3: Installation, Wiring and Configuration

Safety Guidelines ........................................................................................................ 3-2

Plan for Safety ����������������������������������������������������������������������������������������������������������� 3-2
Security Considerations ��������������������������������������������������������������������������������������������� 3-2

Wiring Diagrams ......................................................................................................... 3-3

MB-GATEWAY Configuration ..................................................................................... 3-4

NetEdit Configuration ����������������������������������������������������������������������������������������������� 3-5
Function Codes Supported ���������������������������������������������������������������������������������������� 3-6
Log Modbus/TCP and/or RTU requests to SMTPViewer ��������������������������������������������� 3-6

Chapter 4: Parameters

Home Page ................................................................................................................. 4-2

Gateway Modbus ID ................................................................................................... 4-3

Module Name and Module Description .................................................................... 4-4

IP Setup Configuration Page ...................................................................................... 4-5

Serial Port Configuration Page .................................................................................. 4-6

Set Up Slave Timeout / Retries Page ......................................................................... 4-7

Gateway Device Status Page ...................................................................................... 4-8

1 Automatic Reads ��������������������������������������������������������������������������������������������������� 4-9
2 Last Modbus TCP Request ������������������������������������������������������������������������������������ 4-9
3 Last Modbus RTU Request ���������������������������������������������������������������������������������� 4-10
4 Status Information ���������������������������������������������������������������������������������������������� 4-10

Setup Automatic Read Page ������������������������������������������������������������������������������������ 4-10

Firmware Updates .................................................................................................... 4-11

Chapter 5: Automatic Read Feature

Automatic Read Feature ............................................................................................. 5-2

Situation 1:���������������������������������������������������������������������������������������������������������������� 5-3
Situation 2:���������������������������������������������������������������������������������������������������������������� 5-6

Additional Optimization ............................................................................................. 5-8

Automatic Read Status Data �������������������������������������������������������������������������������������� 5-9

MB-GATEWAY-USER-M Hardware User Manual, 1st Ed. Rev. H 02/21

ii

Table of Contents

Appendix A: Application Examples

Example 1:

Using Modbus Poll to MB-GATEWAY with DL06 Slave ............................................. A-2

Items needed for this example: ��������������������������������������������������������������������������������� A-2
Step 1: Connect the MB-GATEWAY serial port to the DL06 secondary communications

port� �������������������������������������������������������������������������������������������������������������� A-2
Step 2: Configure the DL06 PLC serial port and MB-GATEWAY serial port� ��������������� A-3
Step 3: Connect to the MB-GATEWAY using the Modbus Poll simulator software� ���� A-7

Example 2:

Using Modbus Poll to MB-GATEWAY with CLICK Slave ......................................... A-11

Items needed for this example: ������������������������������������������������������������������������������� A-11
Step 1: Connect the MB-GATEWAY serial port to Port 3 of the CLICK PLC� ������������� A-11
Step 2: Configure the CLICK serial port and MB-GATEWAY serial port� ������������������� A-12
Step 3: Connect to the MB-GATEWAY using the Modbus Poll simulator software� �� A-18

Example 3:

Using P3000 as Master (Client) to MB-GATEWAY with CLICK Slave. .................... A-24

Step 1: Connect CLICK to the MB-GATEWAY as shown in example 2� �������������������� A-24
Step 2: Connect P3000 CPU (P3-550) to MB-GATEWAY via Ethernet Switch and Two

Ethernet Cables� ������������������������������������������������������������������������������������������ A-24
Step 3: Configure the MRX instruction to read data from the MB-GATEWAY� ��������� A-28

Example 4:
DirectLogic 06 (H0-ECOM100) as Master (Client) to

MB-GATEWAY with Mulitple GS Drives as Slaves. .................................................. A-29

Step 1: Set up Peer to Peer Configuration ��������������������������������������������������������������� A-30
Step 2: Set the Serial Port Configuration ����������������������������������������������������������������� A-31
Step 3: Set the Communication Parameters ������������������������������������������������������������ A-31
Step 4: Using Automatic Reads �������������������������������������������������������������������������������� A-32
Step 5: Access the Automatic Read Data ����������������������������������������������������������������� A-33
Step 6: Read and Write from the DL06 ������������������������������������������������������������������� A-36

Appendix B: Modbus Error Codes

Modbus Error Codes ................................................................................................... B-2

Appendix C: Security Considerations for Control Systems Networks

Security Considerations for Control Systems Networks............................................ C-2

Index

MB-GATEWAY-USER-M Hardware User Manual, 1st Ed. Rev. H 02/21

iii

Chapter

Chapter

Chapter

GeTTinG sTarTed

1

1

1

In this Chapter...

Introduction ...................................................................................................................1-2

Overview of this Publication �����������������������������������������������������������������������������������������1-2
Who Should Read This Manual �������������������������������������������������������������������������������������1-3
Technical Support ��������������������������������������������������������������������������������������������������������1-3

Conventions Used ..........................................................................................................1-4

Key Topics for Each Chapter ���������������������������������������������������������������������������������������1-4

Product Overview ..........................................................................................................1-5

What’s in the Box ..........................................................................................................1-6

Mounting / Clearance Information ...............................................................................1-6

Direct Mounting�����������������������������������������������������������������������������������������������������������1-6
DIN Rail Mounting �������������������������������������������������������������������������������������������������������1-7

Agency Approvals ..........................................................................................................1-7

Introduction

MB-GATEWAY

devices

TCPRTU

Modbus Response

Chapter 1: Getting Started

Overview of this Publication

Modbus is one of the most popular communication protocols in the automation industry
because it supports both traditional RS-232/422/485 devices and newly developed industrial
Ethernet devices. Many industrial devices, such as PLCs, HMIs, instruments and meters
use Modbus as their standard communication protocol. However, the Modbus protocols
running over serial and Ethernet are so different that a communication gateway is needed as
a bridge for integrating devices from these two networks. The MB-GATEWAY is a Modbus
TCP (Ethernet) to Modbus RTU (Serial) Gateway which provides the necessary bridge to
connect Modbus RTU (Serial) products to Ethernet LANs.

The Modbus TCP side of the Gateway functions as a TCP Server (slave) while the Modbus
RTU side functions as a serial Client (master). The serial side physical interface is
RS-422/485 2 or 4 wire so up to 128 Modbus RTU devices can be accessed by a Modbus
TCP Client device (up to 12 simultaneous connections). The actual number of Modbus
RTU slaves will depend on their individual transceiver loads.

Gateway Modbus

Address = 255

Serial

RS-485

Modbus

TCP Client

device

Ethernet

Modbus

RTU slave

device 1

Modbus

RTU slave

device 5

1

2

3

4

5

6

7

8

9

10

11

Other

Modbus Query

Client

The MB-GATEWAY User Manual describes the installation, configuration, and methods of
operation of the MB-GATEWAY Module.

MB-GATEWAY-USER-M Hardware User Manual, 1st Ed. Rev. H 02/21

MB-GATEWAY

Server

Modbus Query

Modbus Response

Master

Slave

1-2

12

13

14

A

B

C

D

Chapter 1: Getting Started

Who Should Read This Manual

This manual contains important information for those who will install, maintain, and/or
operate The MB-GATEWAY Module.

1

Technical Support

We strive to make our manuals the best in the industry. We rely on your feedback to let us
know if we are reaching our goal. If you cannot find the solution to your particular application,
or, if for any reason you need technical assistance, please call us at:

770–844–4200

Our technical support group will work with you to answer your questions. They are available
Monday through Friday from 9:00 A.M. to 6:00 P.M. Eastern Time. We also encourage you
to visit our web site where you can find technical and non-technical information about our
products and our company.

http://www.automationdirect.com

2

3

4

5

6

7

8

9

10

11

12

MB-GATEWAY-USER-M Hardware User Manual, 1st Ed. Rev. H 02/21

13

14

A

B

C

D

1-3

Conventions Used

Chapter 1: Getting Started

1

When you see the “notepad” icon in the left-hand margin, the paragraph to its immediate right will be a special
note. The word NOTE: in boldface will mark the beginning of the text.

When you see the “exclamation mark” icon in the left-hand margin, the paragraph to its immediate
right will be a warning. This information could prevent injury, loss of property, or even death (in
extreme cases). The word WARNING: in boldface will mark the beginning of the text.

Key Topics for Each Chapter

The beginning of each chapter will list the key topics that can be found in that chapter.

Getting Started

CHAPTER

1

In This Chapter...

General Information

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

...........................................................................1-4Specifications

2

3

4

5

6

7

8

9

10

11

12

MB-GATEWAY-USER-M Hardware User Manual, 1st Ed. Rev. H 02/21

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14

A

B

C

D

1-4

Product Overview

Chapter 1: Getting Started

1

2

3

4

5

6

7

8

AutomationDirect’s MB-GATEWAY is a single port Modbus Gateway module that converts
Modbus TCP to Modbus RTU. It supports up to 12 simultaneous Modbus TCP Client
(master) Ethernet connections, and up to 128 RTU Server (slave) Serial connections.
MB-GATEWAY requires 10VDC to 36VDC from an external power supply. Each module
has one RJ45 10/100 Mbps Ethernet port and one RS-422/485 2 or 4 wire Serial Port. It
supports NetEdit (Ver 3.8 and later) or Web Browser based configuration tools.

Key features include:

• Automatic Read Function

• RJ45 10/100 Mbps Ethernet Port

• RS-422/485 2 or 4 wire Serial Port

• True failsafe receiver while maintaining EIA/TIA-485 compatibility

• Supports NetEdit and Web Browser configuration tools

• Autodetects Ethernet cable types (MDI/MDX)

• 35mm DIN rail mount

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What’s in the Box

Chapter 1: Getting Started

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MB-GATEWAY

Mounting / Clearance Information

There are two options for mounting the MB-GATEWAY module.

Direct Mounting

The MB-GATEWAY module can be mounted in either a low-profile orientation or a slim­mount orientation using screw holes on the provided mounting adapter. Screws are not
provided

DIN Rail Mounting

Adapter

Baud Rate

2 1 0 - Switch
0 0 0 = SW cfg
0 0 1 = 4800
0 1 0 = 9600
0 1 1 = 14400
1 0 0 = 19200
1 0 1 = 38400
1 1 0 = 57600
1 1 1 = 115200

Parity

4 3 - Switch
0 0 = None
0 1 = Odd
1 0 = Even
1 1 = Resvd

Stop Bits

5 - Switch
0 = 1 Bit
1 = 2 Bits

6 - Reset IP Cfg
7 - Reserved

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Chapter 1: Getting Started

C

US

DIN Rail Mounting

The MB-GATEWAY module can be snapped onto a standard 35 mm x 7.5 mm height DIN
rail (Standard: CENELEC EN50022). They can be mounted either vertically or horizontally.
Refer to the mechanical drawings that follow for proper mounting.

DIN rail mounting steps:

1. Hook bottom back of unit over the DIN rail.

2. Push top back onto the DIN rail until it snaps into place.

DIN rail removal steps:

A. Pull up on tab at the top of the mounting adapter with a screwdriver.
B. Rotate the bottom of the unit away from the DIN rail.
C. Pull unit down and away from DIN rail.

1

2

3

4

5

Mounting

2

Agency Approvals

Name UL/CUL UL508 CE

MB-GATEWAY E185989 E185989 Yes

B

Baud Rate

2 1 0 - Switch
0 0 0 = SW cfg
0 0 1 = 4800
0 1 0 = 9600
0 1 1 = 14400
1 0 0 = 19200
1 0 1 = 38400
1 1 0 = 57600
1 1 1 = 115200

Parity

4 3 - Switch
0 0 = None
0 1 = Odd
1 0 = Even
1 1 = Resvd

Stop Bits

5 - Switch
0 = 1 Bit
1 = 2 Bits

6 - Reset IP Cfg
7 - Reserved

UL/CUL/CE Certification Numbers

U

R

1

L

Removal

Baud Rate

2 1 0 - Switch
0 0 0 = SW cfg
0 0 1 = 4800
0 1 0 = 9600
0 1 1 = 14400
1 0 0 = 19200
1 0 1 = 38400
1 1 0 = 57600
1 1 1 = 115200

Parity

4 3 - Switch
0 0 = None
0 1 = Odd
1 0 = Even
1 1 = Resvd

Stop Bits

5 - Switch
0 = 1 Bit
1 = 2 Bits

6 - Reset IP Cfg
7 - Reserved

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Chapter

Chapter

Chapter

speCifiCaTions

2

2

2

In this Chapter...

Specifications .................................................................................................................2-2

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

Dip Switch Information .................................................................................................2-4

Dimensional Drawing ....................................................................................................2-5

Specifications

Chapter 2: Specifications

Port RJ-45

Speed 10/100 Mbps

Ethernet

Interface

Serial

Interface

Power Consumption

Wire Range

Wire Strip Length

Screw Torque

Operating Temperature Range

Storage Temperature Range

Humidity

Environmental Air

Vibration

Weight

Protection Built-in 1.5 KV magnetic isolation

Protocol Supported Modbus TCP/IP Server (Slave)

Clients (Masters)

Supported
Cable Type Autodetects Ethernet cable types (MDI/MDX)

Port 6-position terminal strip (Phoenix #1863194) provided

Supported Signal Lines

Supported Baud Rates

Parity Odd, Even, None

Data Bits 8

Stop Bits 1, 2

Protocol Supported Modbus RTU Client (Master)

Servers (Slaves)

Supported

Termination

Shock

Specifications

12 simultaneous Modbus TCP connections

RS-422 (5-wire) Signals: TX+, TX-, RX-, RX+, GND

RS-485 (3-wire) Signals: Data+, Data -, GND

300*, 600*, 1200*, 2400, 4800, 9600,

14.4k, 19.2k, 38.4k, 57.6k, 115.2k

* Cannot be set with DIP switches.

Must be set via web browser configuration.

128

Permanently installed 120ΩΩ resistor between

3-position terminal strip (Phoenix #1863165) provided

16 - 28 AWG Solid or Stranded Conductor (1.5 mm

For use in Pollution Degree 2 Environment. No corrosive gases

Data+ and Data -

Use Class 2 power supply

Use conductors rated 60/75 °C

0.24 - 0.27 in (6 - 7 mm)

0 to 60 °C (32 to 140 °F)

-20 to 70 °C (-4 to 158 °F)

5 to 95% RH (non-condensing)

2W

1.7 lb-in (0.2 Nm)

MIL STD 810C 514.2

MIL STD 810C 516.2

0.2 lbs (0.09 kg)

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LED Indicators

Chapter 2: Specifications

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5

STA

The STA or STATUS LED is steady ON when the MB-GATEWAY has passed power-up
diagnostics and is ready for use.

SPD

The SPD or SPEED LED is used to represent the Ethernet speed. The LED will be ON
when the Ethernet speed is 100Mbps and OFF when the speed is 10Mbps.

TXD

The TXD or TRANSMIT DATA LED flashes to indicate that the MB-GATEWAY is
sending data through the serial port.

ERR

If the MB-GATEWAY’s ERR (ERROR) indicator is:

• ON - a critical error has occurred. The error may be in the card itself, or the result of a network
problem. The ERROR indication can be caused by a faulty ground, an electrical spike or other
types of electrical disturbances. Cycle power to the system to attempt clearing the error.

• Flashing once per second - a firmware update is in progress.

• Flashing randomly - a Modbus/RTU error. This could be a timeout or an actual error response.
Check the Gateway Device Status page on the MB-GATEWAY configuration web page to see the
quantity of Request Errors and the description of the Last Request Error.

A CRC error for an Automatic Reads table entry will flash the ERRor LED and set the Last
Request Error to: MODBUS_ERROR_MEMORY_PARITY_ERROR.

For a direct request from a Modbus TCP server, a Modbus RTU parity error will return the
error MODBUS_ERROR_MEMORY_PARITY_ERROR to the Modbus TCP server.

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Chapter 2: Specifications

LK/A

The LK/A or LINK GOOD/ACTIVITY LED flashes to indicate that the card sees data
traveling on the Ethernet network. If any network device is sending or receiving data, the
LK/A LED will be flashing. During heavy communication loads, this indicator will be steady
ON. If the LED is OFF, then a problem with the Ethernet connection has been detected.

RXD

The RXD or RECEIVE DATA LED flashes to indicate that the MB-GATEWAY is receiving
data through the serial port.

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Dip Switch Information

01

12

and gateway address in the MB-GATEWAY to 0.0.0.0

Chapter 2: Specifications

S7S6S5S4S3S2S1

OFF

ON

OFF

S6S5S4S3S2S1S0

GND
RXD+
RXD­TXD­TXD+
GND

+V

+ INPUT

10-36 VDC

COM

Chasis

S7 S6 S5 S4 S3 S2 S1 S0 Switch seng

1

Rese rved

* Seng S6 to on will, on power cycle, set the IP address, subnet mask

S7

ON

MB-GATEWAY

MODBUS TCP/IP to MODBUS RTU

000Soware Config

001 4800

010 9600

011 14400

100 19200

101 38400

110 57600

111 115200

00 None

01 Odd

10 Even

11 Reserved

S0

Baud Rate

2 1 0 - Switch
0 0 0 = SW cfg
0 0 1 = 4800
0 1 0 = 9600
0 1 1 = 14400
1 0 0 = 19200
1 0 1 = 38400
1 1 0 = 57600
1 1 1 = 115200

Parity

4 3 - Switch
0 0 = None
0 1 = Odd
1 0 = Even
1 1 = Resvd

Stop Bits

5 - Switch
0 = 1 Bit
1 = 2 Bits

6 - Reset IP Cfg
7 - Reserved

Bit

Bits

*

S7 reserved

Baud Rate Parity

Bits

IP

1

2

3

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A

Stop

B

Reset

C

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Dimensional Drawing

Chapter 2: Specifications

Inches [mm]

Baud Rate

2 1 0 - Switch
0 0 0 = SW cfg
0 0 1 = 4800
0 1 0 = 9600
0 1 1 = 14400
1 0 0 = 19200
1 0 1 = 38400
1 1 0 = 57600
1 1 1 = 115200

Parity

4 3 - Switch
0 0 = None
0 1 = Odd
1 0 = Even
1 1 = Resvd

Stop Bits

5 - Switch
0 = 1 Bit
1 = 2 Bits

6 - Reset IP Cfg
7 - Reserved

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Chapter

Chapter

Chapter

insTallaTion, WirinG

and ConfiGuraTion

3

3

2

In this Chapter...

Safety Guidelines ...........................................................................................................3-2

Plan for Safety ��������������������������������������������������������������������������������������������������������������3-2
Security Considerations ������������������������������������������������������������������������������������������������3-2

Wiring Diagrams ............................................................................................................3-3

MB-GATEWAY Configuration ........................................................................................3-4

NetEdit Configuration ��������������������������������������������������������������������������������������������������3-5
Function Codes Supported �������������������������������������������������������������������������������������������3-6
Log Modbus/TCP and/or RTU requests to SMTPViewer ������������������������������������������������3-6

Safety Guidelines

Chapter 3: Installation, Wiring and Configuration

Warning: Providing a safe operating environment for personnel and equipment is your responsibility
and should be your primary goal during system planning and installation. Automation systems can
fail and may result in situations that can cause serious injury to personnel or damage to equipment.
Do not rely on the automation system alone to provide a safe operating environment. You should use
external electromechanical devices, such as relays or limit switches, that are independent of the PLC
application to provide protection for any part of the system that may cause personal injury or damage.
Every automation application is different, so there may be special requirements for your particular
application. Make sure you follow all national, state, and local government requirements for the proper
installation and use of your equipment.

Plan for Safety

The best way to provide a safe operating environment is to make personnel and equipment
safety part of the planning process. You should examine every aspect of the system to
determine which areas are critical to operator or machine safety. If you are not familiar with
control system installation practices, or your company does not have established installation
guidelines, you should obtain additional information from the following sources.

• NEMA — The National Electrical Manufacturers Association, located in Washington, D.C.
publishes many different documents that discuss standards for industrial control systems. You can
order these publications directly from NEMA. Some of these include:

ICS 1, General Standards for Industrial Control and Systems

ICS 3, Industrial Systems

ICS 6, Enclosures for Industrial Control Systems

• NEC — The National Electrical Code provides regulations concerning the installation and use of
various types of electrical equipment. Copies of the NEC Handbook can often be obtained from
your local electrical equipment distributor or your local library.

• Local and State Agencies — many local governments and state governments have additional
requirements above and beyond those described in the NEC Handbook. Check with your local
Electrical Inspector or Fire Marshall office for information.

Security Considerations

When implementing any method of remote access to your equipment, you need to consider
the security exposure in order to minimize the risks to your processes and your equipment.
Security should always be carefully evaluated for each installation. Refer to “Appendix C:
Security Considerations for Control Systems Networks” for more information.

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Wiring Diagrams

The MB-GATEWAY module can be wired in either 4-wire or 2-wire mode.

Chapter 3: Installation, Wiring and Configuration

1

Gateway Slave 1Slave 2Last Slave

GND

RX+

RX­TX­TX+

Internally Connected

GND

(Gateway contains a

120Ω Termination Resistor

between RX+ and RX-)

Recommended Cable - AutomationDirect L19773 shielded cable or equivalent

GND

TX+
TX-

RX-

RX+

GND

TX+

TX­RX­RX+

GND

TX+

TX-

RX-

*

RX+

* User Supplied

120Ω Termination

Resistor

RS-485

Gateway Slave 1Slave 2Last Slave

GND

RS-422/RS-485

RX+

RX-

TX-

TX+

Internally Connected

GND

(Gateway contains a

120Ω Termination Resistor

between RX+ and RX-)

Recommended Cable - AutomationDirect L19954 shielded cable or equivalent

D+

D-

GND

D+

D-

GND

D+

*

D-

GND

* User Supplied

120Ω Termination

Resistor

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MB-GATEWAY Configuration

The MB-GATEWAY supports 128 Modbus RTU nodes on the serial side. The RS-485
specification supports up to 32 devices before a repeater device is required. Proper cabling and
termination is required. For RS-485 4-wire installations , a cable with the proper shielding
and impedance should be used such as a Belden model 9843. For RS-485 2 wire installations,
a cable such as the Belden model 9842 should be used. A 120 ohm resistor should be used
for termination on each end of the network as shown in the previous wiring diagrams. The
GATEWAY module has a termination resistor pre-installed so only one resistor needs to be
added to the opposite end of the network away from the Gateway module.

The MB-GATEWAY module supports up to 12 simultaneous Modbus TCP connections.
The MB-GATEWAY’s TCP listening port is the standard Modbus TCP port 502 (not
configurable).

One of the major features of the MB-GATEWAY module is the “Automatic Read” function.
This feature utilizes the ‘idle’ time of the module while it is waiting for Ethernet requests.
The Automatic Read function can be configured to poll specific Modbus data points of the
serial nodes and place that data into a local ‘data buffer’. If a Modbus Ethernet request comes
in for one of those data points, the MB-GATEWAY module will immediately respond with
the data from local buffer and thereby respond much faster than it would if it had to generate
a new serial request. See Chapter 5 for more information.

The factory IP setting of the MB-GATEWAY module is to retrieve an IP address via
DHCP. In order to see what IP address has been assigned and/or to change that setting the
NetEdit software tool will be required to discover and configure the MB-GATEWAY TCP/
IP settings. NetEdit is a free tool that is accessible at AutomationDirect’s website or HOST
engineering’s website (http://www.hosteng.com/SW-Products/SP_Demo_Utilites.htm#NetEdit3).

Chapter 3: Installation, Wiring and Configuration

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NOTE: NetEdit version 3.8 or later is required to support MB-GATEWAY

MB-GATEWAY Configuration continued on the next page

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Chapter 3: Installation, Wiring and Configuration

NetEdit Configuration

Using NetEdit is very simple. Once the software has been installed, follow the steps below to
configure the settings of your MB-GATEWAY module.

• Start the software. It will scan automatically when you start it but if your MB-GATEWAY is
inaccessible at the point of starting the software, you can press the “Scan Network” button at the
top to make it scan again once the MB-GATEWAY has become accessible.

1

2

NOTE: If you are unable to see the MB-GATEWAY...

1) If your PC has more than one NIC (Network Interface Card), e.g. a wireless and a wired, then
you may need to either disable the NIC(s) you are not using, or re-prioritize them such that the
NIC you are using is top priority.

2) Verify the Network Interface on your PC is functioning properly

3) Verify all connections between the PC and the MB-GATEWAY are properly made

4) Disable your firewall or open TCP port 28787 to allow NetEdit.

5) NetEdit version 3.8 or later is required to support MB-GATEWAY.

• In the Main window, double click on the MB-GATEWAY module that you want to configure.

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• Select “Use the following IP settings”.

• Type in the settings that are compatible with your network and press the OK button and the
MB-GATEWAY module’s IP settings are now configured.

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Chapter 3: Installation, Wiring and Configuration

After the MB-GATEWAY module’s IP settings have been configured to be compatible
with the subnet of your PC, you can open Internet Explorer (or the Web browser of your
choice) and continue the configuration for your application. You can also right click on the
MB-GATEWAY in the main NetEdit window and choose “Start Web based config…” to
start your default Web browser with the correct IP address pre-configured for you.

Function Codes Supported

The function codes supported by the MB-GATEWAY differ based upon whether the target
from the Modbus Client is the MB-GATEWAY directly by utilizing the Gateway Modbus
ID and the Automatic Read function or direct access to a Modbus serial slave by specifying
the Unit ID of the Modbus Slave node itself.

1

2

3

4

Target = MB-GATEWAY Module (using Gateway Modbus ID and Automatic Read
Function):

• Function Code 1 (Read Coils 0xxxxx)

• Function Code 2 (Read Input Bits 1xxxxx)

• Function Code 3 (Read Holding Registers 4xxxxx)

• Function Code 4 (Read Input Registers 3xxxxx)

• Function Code 8 (Read Diagnostics <Read Query Data Function>)

Target = MB-GATEWAY Modbus Slave Node (using Unit ID of Slave Node):

• Any function code supported by the Modbus Slave device

Log Modbus/TCP and/or RTU requests to SMTPViewer

Available in firmware 1.0.679 and later
Using the SMTPViewer (download from HostEng.com and install it in the \HAPTools

folder), you can see the TCP and RTU requests that are being processed by the
MB-GATEWAY. This logging feature will only send packets to the PC that requested the
logging; therefore it is not using broadcast packets, and each Gateway can only log data to 1
PC at a time.

To use logging, connect to MB_GATEWAY with SMTPViewer (UDP only; port
0x7272) and issue the following command:

‘Log [req] [rsp] [rtu] [tcp] [dev #] [raw]’
req = Log requestsrsp = Log responsesrtu = Log RTU transactionstcp = Log TCP

transactionsraw = Show raw bytes instead of decoding transactionsdev # = Ex ‘dev 1’ would
show only transactions for device 1

For example, to see all Modbus/RTU transactions (requests and responses) to/from device 1
in a decoded form, the command is:‘Log rtu req rsp dev 1’

The command ‘log’ by itself defaults to ‘log req rsp rtu tcp’ which will show all requests and
responses for all devices in a decoded form. All forms of the log command toggle from on to
off, so you can issue the same command again to turn logging off.

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Chapter

Chapter

Chapter

parameTers

4

4

4

In this Chapter...

Home Page ...................................................................................................................4-2

Gateway Modbus ID ..................................................................................................... 4-3

Module Name and Module Description ......................................................................4-4

IP Setup Configuration Page ........................................................................................4-5

Serial Port Configuration Page ....................................................................................4-6

Set Up Slave Timeout / Retries Page ........................................................................... 4-7

Gateway Device Status Page ........................................................................................ 4-8

1 Automatic Reads ����������������������������������������������������������������������������������������������������� 4-9
2 Last Modbus TCP Request ��������������������������������������������������������������������������������������4-9
3 Last Modbus RTU Request ������������������������������������������������������������������������������������4-10
4 Status Information ������������������������������������������������������������������������������������������������ 4-10

Setup Automatic Read Page ��������������������������������������������������������������������������������������4-10

Firmware Updates ......................................................................................................4-11

Home Page

The configuration of the MB-GATEWAY is accessed through a web browser at the well­known HTTP port 80 (not configurable). The image below shows the home page that will
be displayed when the web server of the MB-GATEWAY module is accessed. From this
page, all of the different setup screens can be accessed.

Chapter 4: Parameters

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Gateway Modbus ID

The Gateway Modbus ID is used with the Automatic Read function. This is how the local
data buffer is accessed by the Modbus Client device. The usage of this field will be explained
in more detail in the Automatic Read Function section.

The Modbus ID used in this field should be unique to the serial network and not assigned to any real Modbus RTU
device.

Chapter 4: Parameters

1

2

3

4

5

6

7

8

9

The Back, Send and Reset buttons that appear on these pages have the following behavior:
The Back button will browse back to the previous page viewed without saving any changes

made on the current page.
The Send button will Send any changes made on this page to the MB-GATEWAY,

effectively saving those changes.
The Reset button will undo any changes made on this page, back to the values that have been

Sent to the MB-GATEWAY previously.

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D

Module Name and Module Description

These fields are used only for reference and identification when managing several different
MB-GATEWAY modules on a network.

Chapter 4: Parameters

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IP Setup Configuration Page

The IP address, Subnet Mask and Default Gateway address can be configured on this page.

Chapter 4: Parameters

1

You may lose communications with the MB-GATEWAY module if you configure an IP address and/or
Subnet Mask that is not compatible with the subnet of your PC’s Network Interface Card. You may be
required to change the subnet settings of your PC or use the NetEdit tool to regain communications in
this situation.

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Serial Port Configuration Page

This page is used to configure the serial port parameters if you do not want to use the
dipswitch settings or if baud rates different than the dipswitch settings range are desired. The
serial port settings should match the settings of the Modbus RTU serial nodes connected to
the MB-GATEWAY module. In some situations, such as a high amount of electrical noise,
poor cabling, etc., it may be necessary to reduce the baud rate on the MB-GATEWAY
module AND serial devices on the network.

Chapter 4: Parameters

1

2

3

In order to use the software based configuration, switches S0, S1, and S2 must be turned OFF.

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Set Up Slave Timeout / Retries Page

The “Set Up Slave Timeout/Retries” page is used to configure the timing on the serial side of
the MB-GATEWAY module. By default, all serial requests will use the “Default Timeout”
value and “Default Retries” value. If there are devices on the serial network that require
different timing adjustments, those exception cases can be added to the table below. Simply
specify the node ID, the timing value and retry count necessary for that device.

The way that the timeout and retry field is utilized is:
The MB-GATEWAY will send a request to the serial device, if there is no reply from the
device within the Timeout value specified, the MB-GATEWAY will send another request
and wait again. It will do this for the number of times specified in the Retry field. Once the
MB-GATEWAY has attempted to access the device for the number of retry counts specified
and no reply is forthcoming, the MB-GATEWAY will respond with an exception error: 04
(Slave device failure).

The “Inter-packet TX Delay” field specifies how long between serial requests the
MB-GATEWAY module should wait . This applies to all serial requests to all serial devices
on the serial side of the module.

Chapter 4: Parameters

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Gateway Device Status Page

The Gateway Device Status page contains statistical information about the MB-GATEWAY
module that can be used to gauge the performance of the communications and to
troubleshoot communications.

Chapter 4: Parameters

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Chapter 4: Parameters

1 Automatic Reads

This table shows statistical information about the requests being sent when the Automatic
Read function is being utilized. This information can help to indicate whether this table has
been configured correctly or not.

Table Item: Corresponds to the position in the table of the “Set Up Automatic Reads” page.
Error Count: Indicates how many error requests have occurred for that table item. This could be a

timeout error or an exception response.

Last Error: Indicates the error code from the last error request. If the device fails to respond

(Timeout), the error “Slave Device Failure” will be shown in this field.

Retries: Indicates how many retries have occurred. It is a cumulative value and does not reset unless

the module has been power cycled or the “Clear Values” button at the bottom has been
pressed.

Timeout: Indicates how many times a request has not received a reply within the specified timeout

period. It is a cumulative value and does not reset unless the module has been power
cycled or the “Clear Values” button at the bottom has been pressed.

Number Completed: Indicates how many requests have been sent for that table item.

2 Last Modbus TCP Request

This table shows statistical information about the last request that was received on the
Modbus TCP side from a Modbus TCP Client device.

Slave Number: Indicates the “Unit ID” number within the Modbus TCP header of the Modbus

TCP request.

Function: Indicates the Modbus function requested within the Modbus TCP request.
Reference: Indicates the starting address requested within the Modbus TCP request. The

“Reference” value is the offset from 0. More information will be explained in the
Automatic Read Function section as to how this Reference value corresponds to a
Modicon style address that is found in many Modbus devices.

Count: Indicates the number of Registers, Coils or Bits requested within the Modbus TCP request.
Data: This field indicates the Data values written to the MB-GATEWAY module when a Write

function has been sent from the Modbus TCP Client device.

Status: Indicates the action taken by the MB-GATEWAY module upon receiving the Modbus TCP

Client request.

Found in cache = If the Modbus TCP Client request is targeted to the MB-GATEWAY

Module’s Modbus ID and the request corresponds with an address mapped
in the Automatic Read Function, the MB-GATEWAY module will respond
with the data from its local cache. The MB-GATEWAY module will also
return the data from its local cache if the TCP Client request corresponds
with a node number and address that has been configured in the Automatic

Read function table.
Completed = If the request does not meet the criteria explained above, a serial request is created.
Return: This field will indicate whether an error has occurred or not. If this field displays “No

Error”, the request was successful. Otherwise, the Modbus error text will be shown. Refer
to the Modbus specifications error code lists for detailed explanations of each error code.

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Chapter 4: Parameters

3 Last Modbus RTU Request

This table shows the last Modbus RTU request formed by the MB-GATEWAY module
based upon the Modbus TCP Client request received on the Ethernet side.

Slave Number: This is the Node number that was targeted in the last Modbus RTU serial request.
Function: Indicates the Function Code sent to the Modbus serial device in the last request.
Reference: Indicates the starting address requested within the Modbus RTU request. The

“Reference” value is the offset from 0. More information will be explained in the
Automatic Read Function section as to how this Reference value corresponds to a
Modicon style address that is found in many Modbus devices.

Count: Indicates the number of Registers, Coils or Bits requested within the Modbus RTU request.
Data: This field indicates the Data values written to the Modbus RTU device when a Write function

has been sent.
Status: Indicates the action taken by the MB-GATEWAY module on the Modbus RTU side.
Waiting for Header = This indicates that the MB-GATEWAY module has sent a request and is

waiting for the Reply.

Timeout = If a request was sent to a Modbus RTU device and no reply is received, this message

will appear.

Completed = If the request was sent and a reply was received, this message will show in the

Status field.

Return: This field will indicate whether an error has occurred or not. If this field displays “No

Error”, the request was successful. Otherwise, the Modbus error text will be shown. Refer to
the Modbus specifications error code lists for detailed explanations of each error code.

4 Status Information

This table shows a summary of the current session (since power cycle or Clear Values button
selected). Comparing Requests to Cache Hits can help indicate whether the Automatic Reads
are configured to maximize efficient communications. And total Error, Retry and Timeout
data can indicate health of communications.

A CRC error for an Automatic Reads table entry will flash the ERRor LED and set the Last
Request Error to: MODBUS_ERROR_MEMORY_PARITY_ERROR.

For a direct request from a Modbus TCP server, a Modbus RTU parity error will return the
error MODBUS_ERROR_MEMORY_PARITY_ERROR to the Modbus TCP server.

Setup Automatic Read Page

The Automatic Read Feature is explained in detail in Chapter 5: Automatic Read Feature.

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Firmware Updates

This link sends you to Host Engineering’s website to retrieve the latest firmware for the
MB-GATEWAY module. The NetEdit tool is required to upgrade firmware in the
MB-GATEWAY module. The steps are shown below:

Open the NetEdit software. You may allow the NetEdit software to download the latest
firmware for the MB-GATEWAY module by clicking on File-> Live Update.

Once you have the firmware file to load into the MB-GATEWAY module, click on the Scan
Network button at the top left to browse for the MB-GATEWAY module that is in the
subnet of the PC.

Chapter 4: Parameters

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Click on the GATEWAY module that you wish to upgrade and then select the “General
Settings” tab at the bottom of the screen. Click on the “Update Firmware” button in the
“General Settings” tab. You will get a dialog box to select the firmware file that you wish to
upgrade to. Select the correct file and click on the “Open” button.

Firmware Updates continued on the next page.

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Confirm that you wish to perform the upgrade by clicking on the “Yes” button.

Once the process is complete, you will receive a dialog confirming success.

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Chapter

Chapter

Chapter

auTomaTiC read
feaTure

5

5

5

In this Chapter...

Automatic Read Feature ............................................................................................... 5-2

Situation 1:������������������������������������������������������������������������������������������������������������������5-3
Situation 2:������������������������������������������������������������������������������������������������������������������5-6

Additional Optimization ............................................................................................... 5-8

Automatic Read Status Data ���������������������������������������������������������������������������������������� 5-9

Automatic Read Feature

The Automatic Read Feature allows the MB-GATEWAY module to utilize some of the idle
time that usually occurs between Modbus TCP requests from the Client device. Note that
this feature only allows the reading of data from the serial devices and not writing to them.
Up to 16 automatic read requests can be configured.

Chapter 5: Automatic Read Feature

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Chapter 5: Automatic Read Feature

The MB-GATEWAY module can be assigned a Modbus Node address that corresponds with
the “Unit ID” number that is sent within the Modbus TCP header that is typically used to
target a Modbus RTU node that is on the serial side of the MB-GATEWAY. Therefore, the
Node number that is assigned to the MB-GATEWAY module should be unique from any
Modbus RTU nodes on the serial network. The Automatic Read function reads the specified
registers, bits or coils from the Modbus RTU nodes and places that data into the specified
MB-GATEWAY addresses that can be retrieved on the Ethernet side by specifying the
MB-GATEWAY’s Modbus address in the Unit ID field of the Modbus TCP client request.
An example is shown below:

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2

3

Situation 1:

Modbus TCP Client device sends a request for a device not configured in the Automatic
Read table. This will, in turn, generate a fresh new request on the serial side of the
MB-GATEWAY module.

Memory

To Read

3- Holding

Regs.

Request:

Slave Num = 5,

Modbus

TCP Client

device

Step 1: Modbus TCP request is generated to Serial Slave Num 5 at Starting Address 10, size 1

Start Addr = 10,

Num of Elements = 1

Slave

Number

RTU

Number

Start

Address

Elements

1010

MB-GATEWAY

Gateway Modbus

Address = 255

Serial

RS-485

Ethernet

Gateway

of

Memory
Address

Other

devices

Modbus

RTU slave

device 1

Modbus

RTU slave

device 5

4

5

6

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Chapter 5: Automatic Read Feature

Modbus

TCP Client

device

Memory

To Read

3- Holding

Regs.

Slave

Number

RTU

Number

Start

Address

Elements

1010

MB-GATEWAY

Gateway Modbus

Address = 255

Serial

RS-485

Ethernet

of

Request:

Slave Num = 5,

Start Addr = 10,

Num of Elements = 1

Gateway

Memory
Address

RTU slave

RTU slave

Other

devices

Step 2: Request is then generated on the Serial side of the MB-GATEWAY.

Memory

To Read

3- Holding

Regs.

Slave

Number

RTU

Number

Start

Address

Elements

1010

Gateway

of

Memory
Address

1

2

3

Modbus

4

device 1

5

Modbus

6

device 5

7

8

9

10

Modbus

TCP Client

device

MB-GATEWAY

Gateway Modbus

Address = 255

Serial

RS-485

Modbus

RTU slave

device 1

Reply with data

Ethernet

Modbus

RTU slave

device 5

Other

devices

Step 3: Serial Node replies with data

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Chapter 5: Automatic Read Feature

Modbus

TCP Client

device

Memory

To Read

3- Holding

Regs.

Reply with data

Step 4: Gateway generates TCP reply and sends back to Client device.

Slave

Number

RTU

Number

Start

Address

Elements

1010

MB-GATEWAY

Gateway Modbus

Address = 255

Serial

RS-485

Ethernet

Gateway

of

Memory
Address

Other

devices

Modbus

RTU slave

device 1

Modbus

RTU slave

device 5

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2

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6

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Chapter 5: Automatic Read Feature

Situation 2:

In this example, the Modbus TCP Client device is sending a request directly to the
MB-GATEWAY itself that spans multiple entries in the Automatic Read table.

Memory

To Read

3- Holding

Regs.

3- Holding

Regs.

Modbus

TCP Client

device

Step 1: Before a request even comes in on the Ethernet side, the MB-GATEWAY is reading data from the

serial slaves at the “Inter-packet TX Delay” rate and placing that data into its local cache.

Slave

Number

RTU

Number

Start

Address

Elements

1010

5011

MB-GATEWAY

Gateway Modbus

Address = 255

Serial

RS-485

Ethernet

Cache:
Register 0
Register 1

data

Gateway

of

Request:

Slave Num = 1,

Start Addr = 0,

Num of Elements = 1

Request:

Slave Num = 5,

Start Addr = 0,

Num of Elements = 1

Memory
Address

Reply with data

Reply with data

Other

devices

Modbus

RTU slave

device 1

Modbus

RTU slave

device 5

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2

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4

5

6

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Chapter 5: Automatic Read Feature

Memory

To Read

3- Holding

Regs.

3- Holding

Regs.

Request:

Slave Num = 255,

Modbus

Start Addr = 0,

Num of Elements = 2

TCP Client

device

Step 2: Modbus TCP Request is generated to Serial Slave Num 255 at Starting Address 0, size 2.

Memory

To Read

3- Holding

Regs.

3- Holding

Regs.

Slave

Number

Slave

Number

RTU

Number

Start

Address

Elements

1010

5011

MB-GATEWAY

Gateway Modbus

Address = 255

Serial

RS-485

Ethernet

Cache:
Register 0
Register 1

data

RTU

Number

Start
Address

Elements

1010

5011

MB-GATEWAY

Gateway Modbus

Address = 255

Serial

RS-485

Gateway

of

Memory
Address

Gateway

of

Memory

Address

Other

devices

Modbus

RTU slave

device 1

Modbus

RTU slave

device 5

Modbus

RTU slave

device 1

Modbus

TCP Client

device

Step 3: MB-GATEWAY immediately generates TCP reply and sends back to Client device from local cache

without generating a new serial request.

Reply with data

Ethernet

Cache:
Register 0
Register 1

data

Other

devices

Modbus

RTU slave

device 5

The response time for the TCP request will be significantly faster when the request is targeted
at an address in the Automatic Read table. This can be advantageous if the Modbus TCP
Client is a device that is busy doing numerous other tasks, such as a PLC.

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Additional Optimization

An additional method of optimization is used in the MB-GATEWAY. If a request is sent to
the MB-GATEWAY from the Modbus TCP Client targeted at a Node number and starting
address that is equivalent to an entry in the Automatic Read table, the MB-GATEWAY will
treat the request as if it had been targeted at the MB-GATEWAY Modbus address and will
respond from its local data cache since the data is the same.

Shown below are some more detailed explanations of the different fields that can be
configured in the Automatic Read Function table.

Memory to Read:
There are 5 options:
0 – Unused Entry = Disables this entry in the table.
1 – Coils = Configures this entry to read “Modbus Coils” (Read/Write bits).
2 – Discrete Inputs = Configures this entry to read “Modbus Input Bits” (Read Only bits).
3 – Holding Regs = Configures this entry to read “Modbus Holding Registers” (Read/Write 16

4 – Input Regs = Configures this entry to read “Modbus Input Registers” (Read Only 16 bit

Slave Number:
The network address of the Modbus RTU device to be read on the serial network.

RTU Start Address:
The starting address (based at 0) to be read in the targeted Modbus RTU device on the serial

network.

Number of Elements:
The Number of elements to read from the targeted Modbus RTU device on the serial network.

If the Read is from Coils or Discrete Inputs, the number specified will be the number of bits
from 1 - 2000. If the Read is from Holding or Input Registers, the number specified will be the
number of words (16 bit) from 1 - 125.

Gateway Memory Address:
The starting address in the GATEWAY module’s local data cache to place the data that has been

read from the Modbus RTU device on the serial network.

Gateway Modbus Address:
Displays the Modbus address that the GATEWAY module has been configured for (done in the

“Gateway Modbus ID” section of the home page).

Auto Assign Gateway Addresses:
Selecting this option will allow the configuration software to automatically choose the best local

addresses to place the data that has been read from the Modbus RTU devices.

When the Auto Assign Gateway Addresses option is NOT selected, care must be taken so the
data from different Automatic Reads doesn’t overlap in the Gateway’s internal memory. If you
specify an Automatic Read that will create overlapping data, the value in the Gateway Memory
Address field for that Read will be red.

By default the Gateway will store the data from the individual automatic reads for the same
memory types in consecutive locations in the Gateway’s internal memory. Storing this data in
consecutive data locations in the Gateway’s internal memory allows reads to be optimized into
as few requests as possible.

bit registers).

registers).

Chapter 5: Automatic Read Feature

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Chapter 5: Automatic Read Feature

There are several different ways of addressing when communicating to Modbus devices.
The method of specifying a Function Code and offset that is utilized in the Automatic Read
function is a very common way. Another way that is very common and is seen often in
AutomationDirect products is the use of the Modicon style addressing. This method employs
a PLC style address that contains a Modbus memory type in the highest digit of the address
followed by the offset from 1. A table is provided below that shows comparable addresses for
both of these addressing styles.

Equivalent

*Modbus Function Type Address Range

1. Coils 0 - 65535 00001 - 065536 1 - 2000

2. Discrete Inputs 0 - 65535 100001 - 165536 1 - 2000

3. Holding Regs 0 - 65535 400001 - 465536 1 - 125

4. Input Regs 0 - 65535 300001 - 365536 1 - 125

* NOTE: “Memory to Read” column on Setup Automatic Reads web page

Automatic Read Status Data

Available in firmware 1.0.679 and later
The final selection on this page is the Status Data (Holding Register) Address which allows

the user to map a data area into the Gateway’s Modbus Holding Register memory which will
report the health of each of the automatic read operations. These 17 consecutive Holding
Registers area can then be read from the Modbus Gateway (using the Gateway Modbus
Address as Unit ID in the MRX instruction) to monitor the Automatic reads by the Modbus/
TCP Client.

Modicon Style

Addressing

Number of

Elements

1

2

3

4

5

6

7

8

9

10

11

Click the “show status data format” link to display a page that explains the layout of the
data. The first register contains 1 Bit for each of the possible 16 Automatic Reads. Bit 0 =
1st Automatic Read Operation, Bit 1 = 2nd Automatic Read Operation, ... Bit 15 = 16th
Automatic Read Operation.

A value of 1 in a Bit location means the last Automatic Read operation that corresponds to
that Bit worked and the resulting data is valid.

A Value of 0 in a Bit location means the last Automatic Read operation that corresponds to
that Bit DID NOT work, and the Error Count for that Read Operation was incremented.

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Chapter 5: Automatic Read Feature

For example, if the Status Data Address is set to 4000, the data layout will be:

Holding Register Description

Bit 0 If set, 1st auto read entry is valid and communicating.

4000

4001 Error count for 1st auto read entry

4002

... ...

4016

Bit 1 If set, 2nd auto read entry is valid and communicating.

... ...

Bit 15 If set, 16th auto read entry is valid and communicating.

Error count for 2nd auto read entry

Error count for 16th auto read entry

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appendix

appendix

appendix

appliCaTion examples

A

A

A

In this Appendix...

Example 1: Using Modbus Poll to MB-GATEWAY with DL06 Slave ............................ A-2

Items needed for this example: ����������������������������������������������������������������������������������� A-2
Step 1: Connect the MB-GATEWAY serial port to the DL06 secondary

communications port� ������������������������������������������������������������������������������������� A-2
Step 2: Configure the DL06 PLC serial port and MB-GATEWAY serial port� ����������������� A-3
Step 3: Connect to the MB-GATEWAY using the Modbus Poll simulator software� ������ A-7

Example 2: Using Modbus Poll to MB-GATEWAY with CLICK Slave ........................ A-11

Items needed for this example: ��������������������������������������������������������������������������������� A-11
Step 1: Connect the MB-GATEWAY serial port to Port 3 of the CLICK PLC� ��������������� A-11
Step 2: Configure the CLICK serial port and MB-GATEWAY serial port� ��������������������� A-12
Step 3: Connect to the MB-GATEWAY using the Modbus Poll simulator software� ���� A-18

Example 3: Using P3000 as Master (Client) to MB-GATEWAY with CLICK Slave. ... A-24

Step 1: Connect CLICK to the MB-GATEWAY as shown in example 2� ���������������������� A-24
Step 2: Connect P3000 CPU (P3-550) to MB-GATEWAY via Ethernet Switch and

Two Ethernet Cables� ������������������������������������������������������������������������������������ A-24
Step 3: Configure the MRX instruction to read data from the MB-GATEWAY� ����������� A-28

Example 4: DirectLogic 06 (H0-ECOM100) as Master (Client) to

MB-GATEWAY with Mulitple GS Drives as Slaves. .................................................... A-29

Step 1: Set up Peer to Peer Configuration ����������������������������������������������������������������� A-30
Step 2: Set the Serial Port Configuration ������������������������������������������������������������������� A-31
Step 3: Set the Communication Parameters �������������������������������������������������������������� A-31
Step 4: Using Automatic Reads ���������������������������������������������������������������������������������� A-32
Step 5: Access the Automatic Read Data ������������������������������������������������������������������� A-33
Step 6: Read and Write from the DL06 ��������������������������������������������������������������������� A-36

Example 1:

Internally Connected

Ready to send (+) (RS-422/485)

Appendix A: Application Examples

Using Modbus Poll to MB-GATEWAY with DL06 Slave

This example will illustrate how to use Modbus Poll, which is a PC based Modbus Master
simulator tool, to connect through the MB-GATEWAY to a DL06 PLC via 2 wire RS-485.

Items needed for this example:

• MB-GATEWAY

• DirectLogic 06 PLC (any model)

• PC with Modbus Poll installed (free demo is available at www.modbustools.com)

• Small length of Belden 9842 or equivalent cable

• ZL-CMA15 ZipLink communication port adapter, 15-pin high density female to terminal block

• Ethernet switch and cables to connect from the PC to MB-GATEWAY

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3

4

5

6

Step 1: Connect the MB-GATEWAY serial port to the DL06 secondary

communications port.

Using the short length of Belden 9842, connect the MB-GATEWAY to the DL06 Port 2 as
shown:

RS-422/RS-485

Gateway

GND

RX+

RX-

TX-

TX+

GND

(Gateway contains a

120Ω Termination Resistor

between RX+ and RX-)

GND

ZL-CMA15

to DL06 Port2

TX+
RX+

TX-

RX-

NOTE: If using a connector
other than ZL-CM15 or
ZL-CMA15L, jumpers must
be installed on the
PLC side:
Pin 11 to 14
Pin 12 to 15

DL06 Port 2 Pin Descriptions

1

5V Power (+) connection

2

TXD

3

RXD

4

RTS

5

CTS

6

RXD

7

0V

8

0V

9

TXD+

10

TXD-

11

RTS+

12

RTS-

13

RXD+

14

CTS+

15

CTS-

6

1

11

10

5

15

15-pin Female

D Connector

Transmit data (RS-232C)
Receive data (RS-232C)
Ready to send (RS-232C)
Clear to send (RS-232C)
Recieve data (-) (RS-422/485)
Power (-) connection (GND)
Power (-) connection (GND)
Transmit data (+) (RS-422/485)
Transmit data (-) (RS-422/485)

Ready to send (-) (RS-422/485)
Recieve data (+) (RS-422/485)
Clear to send (+) (RS-422/485)
Clear to send (-) (RS-422/485)

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Step 2: Configure the DL06 PLC serial port and MB-GATEWAY serial port.

Connect to the DL06 PLC with DirectSoft. Go to the PLC pulldown and select Setup >
Setup Secondary Comm. Port as shown:

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Setup the port as shown for Modbus protocol, 38400 baud rate, Odd parity, 1 Stop bit and
Station Number 1. Match everything else as shown. Note the Station Number configured in
the PLC. Once this has been done, click on the icon on the upper right hand side with the
arrow pointing to the PLC to save the settings in the PLC.

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In order to match the serial port settings of the DL06 to the MB-GATEWAY open up a web
browser, such as Internet Explorer, and enter in the IP address of the MB-GATEWAY to
access the main screen as shown:

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For instructions on connecting with a web browser see NetEdit Configuration section in Chapter 3.

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Click on the link to the right of “Serial Port Configuration” and set up the window to match
the DL06 PLC port and then click on the Send button to save the settings:

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Step 3: Connect to the MB-GATEWAY using the Modbus Poll simulator

software.

Once the software has been obtained from www.modbustools.com and installed according to
the directions provided from their website, open up the Modbus Poll software.

Click on the Setup pulldown menu and select Read/Write Definition as shown:

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Configure the Read/Write definition for a simple read of the register 400001, which equates
to V0 in the DirectLogic PLCs.
(see http://support.automationdirect.com/docs/Modbus_xref.pdf for more information on
Modbus addressing to DirectLogic PLC addressing equivalents).

Enter in 1 for the Slave ID. This matches the Unit ID in the protocol that will determine which Modbus Serial Slave
will be targeted on the serial side of the MB-GATEWAY. Entering 1 here will match up to the Station Number
configured above in DirectSoft for the DL06 PLC.

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Choosing Function 3 sets up the read for 4xxxxx registers. Checking the “PLC Addresses (Base 1)” in the lower
right corner matches the addressing to the cross reference chart mentioned above. Once this windows has been
configured as shown above, click on OK.

Now click on the Connection pulldown menu and select Connect:

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In the Connection Setup window, choose the Modbus TCP/IP connection type. Enter the
IP address of your MB-GATEWAY module in the lower left hand corner. Match everything
else as shown:

Click on OK to connect to the MB-GATEWAY.
If everything has been configured correctly, the counter next to “TX =” will increment rapidly

and the counter next to “Err =” will not increment. If the Error counter is incrementing,
go back and verify that all the steps prior to this one have been followed. If you get an error
that says, “Modbus TCP connection failed”, verify that the IP address of the PC and the IP
address of the GATEWAY are in compatible subnets and can communicate.

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Once Modbus Poll is communicating to the PLC, go into DirectSoft, open up a Data View
window and enter in V0 and change the display type to “Decimal” to match the Modbus Poll
software:

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Change the value in data view for V0 to various values and watch the value change in
Modbus Poll to match.

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Example 2:

RS-485

Appendix A: Application Examples

Using Modbus Poll to MB-GATEWAY with CLICK Slave

This example will illustrate how to use Modbus Poll, which is a PC based Modbus Master
simulator tool, to connect through the MB-GATEWAY to a CLICK PLC via 2 wire RS-485.

Items needed for this example:

• MB-GATEWAY

• CLICK PLC (any C0-01xx-x or C0-02xx-x PLC with 3 pin terminal RS-485 port)

• PC with Modbus Poll installed (free demo is available at www.modbustools.com)

• Small length of Belden 9842 or equivalent cable

• Ethernet switch and cables to connect from the PC to MB-GATEWAY

Step 1: Connect the MB-GATEWAY serial port to Port 3 of the CLICK PLC.

Using the short length of Belden 9842, connect the MB-GATEWAY to CLICK’s Port 3 as
shown:

Gateway

GND

RX+

RX-

TX-

TX+

Internally Connected

GND

(Gateway contains a

120Ω Termination Resistor

between RX+ and RX-)

Port 3

3 Pin

Terminal Block

+

-

LG

Port 3 Pin Descriptions

+

Signal A (RS-485)

1

(plus)

-

2

Signal B (RS-485)

(minus)

3

Logic Ground (0V)

LG

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Step 2: Configure the CLICK serial port and MB-GATEWAY serial port.

Connect to the CLICK PLC with CLICK programming software. Go to the Setup pulldown
and select Com Port Setup... as shown:

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Click the Port 3: Setup... button to configure Port 3 of the PLC.

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Configure the port for 38400 baud rate, Odd parity, 1 Stop Bit and Node Address 1. Leave
the other settings as shown below. Note the Node Address number configured here. Once the
settings are configured, Click on the Ok button.

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Next, transfer the project to the PLC for the Port 3 settings to take effect. Select the PLC
pulldown menu and choose Write Project into PLC...

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Choose Ok and follow the steps when prompted to transfer the project to the PLC.

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Appendix A: Application Examples

Now go into the MB-GATEWAY configuration and match the serial port settings to the
PLC Port 3 settings.

Open up a web browser, such as Internet Explorer, and enter in the IP address of the
MB-GATEWAY to access the main screen as shown.

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Click on the link to the right of “Serial Port Configuration” and set up the window to match
the CLICK PLC port and then click on the Send button to save the settings:

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Appendix A: Application Examples

Step 3: Connect to the MB-GATEWAY using the Modbus Poll simulator

software.

Once the software has been obtained from www.modbustools.com and installed according to
the directions provided from their website, open up the Modbus Poll software.

Click on the Setup pulldown menu and select Read/Write Definition as shown:

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Configure the Read/Write definition for a simple read of the register 400001, which equates
to DS1 in the CLICK PLC as shown.

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Enter in 1 for the Slave ID. This matches the Unit ID in the protocol that will determine which Modbus
Serial Slave will be targeted on the serial side of the MB-GATEWAY. Entering 1 here will match up to the
Node Address configured above in the CLICK programming software for Port 3.

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Enter in 1 for the Slave ID. This matches the Unit ID in the protocol that will determine which Modbus
Serial Slave will be targeted on the serial side of the MB-GATEWAY. Entering 1 here will match up to the
Station Number configured above in the CLICK software.

Choosing Function 3 sets up the read for 4xxxxx registers. Checking the “PLC Addresses (Base 1)” in
the lower right corner matches the addressing to the cross reference chart mentioned above. Once this
windows has been configured as shown above, click on OK.

Now click on the Connection pulldown menu and select Connect:

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In the Connection Setup window, choose the Modbus TCP/IP connection type. Enter the
IP address of your MB-GATEWAY module in the lower left hand corner. Match everything
else as shown:

Click on OK to connect to the MB-GATEWAY.
If everything has been configured correctly, the counter next to “TX =” will increment rapidly

and the counter next to “Err =” will not increment. If the Error counter is incrementing,
go back and verify that all the steps prior to this one have been followed. If you get an error
that says, “Modbus TCP connection failed”, verify that the IP address of the PC and the IP
address of the GATEWAY are in compatible subnets and can communicate.

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Once Modbus Poll is communicating to the PLC, go into the CLICK programming
software, open up a Data View window and enter in DS1 as shown.

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Change the value in data view for DS1 to various values and watch the value change in
Modbus Poll to match.

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Example 3:

Appendix A: Application Examples

Using P3000 as Master (Client) to MB-GATEWAY with CLICK
Slave.

Step 1: Connect CLICK to the MB-GATEWAY as shown in example 2.

Step 2: Connect P3000 CPU (P3-550) to MB-GATEWAY via Ethernet Switch

and Two Ethernet Cables.

Configure the IP address of the P3 CPU and the MB-GATEWAY to be compatible subnets.
Steps to configure the IP address of the P3-550 CPU areas follows:

Click on Setup on the top menu bar and choose “Hardware Configuration”.

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Double click on the image of the P3-550 in the center of the hardware configuration.

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Click on the “Ethernet Ports” tab and configure the IP address in the “Use the Following:”
IP address field. Once the correct IP address and Subnet Mask is entered, click on the OK
button and close the hardware configuration window.

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Transfer the project to the PAC in order to have the new settings take effect. To do this,
select File from the pulldown menu and then Transfer Project >To PAC…

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Step 3: Configure the MRX instruction to read data from the MB-GATEWAY.

Double click on the instruction MRX Read to configure the MRX instruction as shown.

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IP Address: address of the GATEWAY.
TCP Port Number: Leave at default 502.
Slave Node Number: This should match the Node address of Port 3 of the CLICK PLC.

Leave at 1 in this case.

Slave Modbus Starting Address: Set to 1 to read address DS1 in the CLICK PLC.
Tag Name Mapping: Create a Tag called CLICK_DS1 as an Signed Int 16 Tag to read in

DS1 from the CLICK PLC.

Use the status bits and Exception Response String to verify whether communications were
successful or not. If the Error bit comes on, look at the Exception Response String to see
which error occurred. If the Timeout Bit comes on, check the IP address settings of the
P3-550 and the GATEWAY and make sure that they are in compatible subnets.

If the Successful Status bit comes on, add the CLICK_DS1 tag to the Data View at the
bottom of the Productivity Suite Programming Software and check the values. Change the
values in the CLICK data view for DS1 and verify that the CLICK_DS1 tag matches.

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Appendix A: Application Examples

DirectLogic 06 (H0-ECOM100) as Master (Client) to
MB-GATEWAY with Mulitple GS Drives as Slaves.

DirectLOGIC
DL06 PLC

w/ ECOM100

10.11.0.221

Ethernet Cat5e

Stride Ethernet

Switch

Ethernet

PC

10.11.0.10

Cat5e

MB-GATEWAY

10.11.0.233
Unit ID 1

RS-485 Cable

MB-GATEWAY

6-Pin

GND

RX+

RX–

TX–

TX+

GND

ZL-CDM-RJ12X4

shield

Cable end marked

“Drive Side”

ZL-CDM-RJ12X4

6-Pin

1

2

3

4

5
6

Cable end

“Drive Side”

GS Drive
Node ID 2

RS-485
GS-RJ12-CBL-2*

*Caution - Wire ONLY the pins connected by

the cable. The drives DC power available at

the RJ12 pins will affect other drives if other

pins are connected.

marked

GS Drive
Node ID 3

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Step 1: Set up Peer to Peer Configuration

In NetEdit, Scan Network to find your H0-ECOM100.
Set the Module ID, IP address and Subnet Mask as appropriate for your network. In our

example, we use 7, 10.11.0.221 and 255.255.255.0 respectively.

In the ECOM Settings tab, click the Peer to Peer Config button. Add the Devices
appropriate for your project.

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In our example we have added three devices that are the MB-GATEWAY:
Device 1 is the Automatic Reads table that resides in the MB-GATEWAY, so it is configured

with the MB-GATEWAY IP address and the MB-GAEWAY Unit ID.
Device 2 is the first drive. It is configured with the MB-GATEWAY IP address and the first

drive Unit ID.
Device 3 is the second drive. It is configured with the MB-GATEWAY IP address and the

second drive Unit ID.

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Step 2: Set the Serial Port Configuration

In the NetEdit Module List, select your MB-GATEWAY. Set the IP address and
subnet mask as appropriate for your network. In our example, we use 10.11.0.233 and

255.255.255.0.
Click Start Web Based Config... To set the Gateway Modbus ID as appropriate for your

network. In our example, we use 1.
Set the Serial Port Configuration as appropriate for your network. For our example, we use:
Baud rate = 19200
Parity = Odd
Stop bit = 1

Step 3: Set the Communication Parameters

Set the communication parameters in the drives as appropriate for your network.
In our example:

Parameter

Number

P9.00 Drive ID 02 03

P9.01 Baud Rate 02 02

P9.02 Modbus RTU, 8-Odd-1 05 05

P3.00

P4.00

Parameter

Description

RS-485 interface,

Keypad STOP disabled

Frequency determined by

RS-485 interface

First Drive Second Drive

04 04

05 05

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Appendix A: Application Examples

Step 4: Using Automatic Reads

In the MB-GATEWAY browser configuration utility, click the Automatic Reads link. Slave
number 2 is the first drive and Slave number 3 is the second drive in our example. Configure
the lines as appropriate.

For our example, we will read the status registers for each drive:

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Appendix A: Application Examples

Step 5: Access the Automatic Read Data

The ECRX iBox is used since the data will be read by the ECOM100, rather than a serial
connection

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ECOM100# = defined for this DL program in the ECOM100 iBox in our Rung 1
Workspace = an internal, private register used by this iBox and MUST BE UNIQUE in this

one instruction and MUST NOT be used anywhere else in your program.
Slave ID = The MB-GATEWAY Modbus Gateway ID, 1, since we are reading the

Automatic Read data stored in the MB-GATEWAY
From Slave Element (Src) = the Gateway Memory Address identified on the

MB-GATEWAY Setup Automatic Reads config page. Note that the address in the
MB-GATEWAY, “0” should be entered here as “V0” and DirectSoft software will change the
name to TA0. This is a naming convention for addresses internal to the PLC and will not

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affect either the targeted address or the use of Timer 0 in the DL program.
Number of Bytes = 20. Since our addresses for both example drives are contiguous, we can

read all 10 elements with one iBox. Each element is a word, 2 bytes, so we want to read 20
bytes to get all 10 elements.

To Master Element (Dest) = the location where the slave data will be placed in the master
ECOM100 PLC

Success = a bit that will turn on once the request is completed successfully
Error = a bit that will turn on if the instruction is not successfully completed

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Appendix A: Application Examples

Step 6: Read and Write from the DL06

To Read data from a drive instead of using of the Automatic Read feature of the
MB-GATEWAY, and to Write data to the drive, the Slave ID in the ECRX and/or ECWX
iBoxes will be the Drive ID. The From Slave Element and/or To Slave Element values will be
the addresses in the drive

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In our example ECRX boxes:

ECOM100# = defined for this DL program in the ECOM100 iBox in our Rung 1.
Workspace = an internal, private register used by this iBox and MUST BE UNIQUE in this

one instruction and MUST NOT be used anywhere else in your program.

Slave ID = The GS Drive Node ID, 2 or 3, depending on which drive we target
From Slave Element (Src) = V20400 equates to Status Monitor 1 in the GS Drive (Hex 2100

and Modbus Decimal 48449). See GS Drive manual for details.
Number of Bytes = Each Modbus register (element) that we want to read is a word, 2 bytes;

in our example we will read 3 status registers.
To Master Element (Dest) = the location where the slave data will be placed in the master

ECOM100 PLC

Success = a bit that will turn on once the request is completed successfully
Error = a bit that will turn on if the instruction is not successfully completed

In our example ECWX boxes:
ECOM100# = Module ID, set in NetEdit and defined for the DL program in the

ECOM100 iBox in our Rung 1
Workspace = an internal, private register used by this iBox and MUST BE UNIQUE in this

one instruction and MUST NOT be used anywhere else in your program.

Slave ID = The GS Drive Node ID, 2 or 3, depending on which drive we target
From Master Element (Src) = the location of data in the Master PLC that will be written to

the drive

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Number of Bytes = 4. In our example, we will write the speed (2 bytes) to the Comm Speed
Reference register and set the next register to RUN (2 bytes)

To Slave Element (Dest) = the Modbus register where the data will be written in the drive.
In this case, V4432 equates to P9.26 Comm Speed Reference. See GS Drive manual for
more details.

Success = a bit that will turn on once the instruction is completed successfully
Error = a bit that will turn on if the instruction is not successfully completed

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appendix

appendix

appendix

modbus error Codes

B

B

B

In this Appendix...

Modbus Error Codes ..................................................................................................... B-2

Modbus Error Codes

Appendix B: Modbus Error Codes

MB-GATEWAY Modbus Error Codes

Error Code Name Explanation

01 ILLEGAL FUNCTION

ILLEGAL DATA

02

ADDRESS

03 ILLEGAL DATA VALUE A value contained in the query data field is not an allowable value for the slave.

SLAVE DEVICE

04

FAILURE

05 ACKNOWLEDGE

06 SLAVE DEVICE BUSY

NEGATIVE

07

ACKNOWLEDGE

MEMORY PARITY

08

ERROR

The function code received in the query is not an allowable action for the slave. If a Poll
Program Complete command was issued, this code indicates that no program function
preceded it.

The data address received in the queryis not an allowable address for the slave.

An unrecoverable error occurred while the slave was attempting to perform the requested
action.

The slave has accepted the request and is processing it, but a long duration of time will be
required to do so. This response is returned to prevent a timeout error from occurring in
the master. The master can next issue a Poll Program Complete message to determine if
processing is completed.

The slave is engaged in processing a long–duration program command. The master should
retransmit the message later when the slave is free.

The slave cannot perform the program function received in the query. This code is returned
for an unsuccessful programming request using function code 13 or 14 decimal. The master
should request diagnostic or error information from the slave.

The slave attempted to read extended memory, but detected a parity error in the memory. The
master can retry the request, but service may be required on the slave device.

1

B

3

4

5

6

7

8

9

10

11

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13

14

A

B

C

D

B-2

appendix

appendix

Security conSiderationS

seCuriTy ConsideraTions

for control SyStemS

for ConTrol sysTems

networkS

neTWorks

In this Appendix...

Security Considerations for Control Systems Networks.............................................. C-2

appendix

C

C

C

Appendix C: Security Considerations for Control Systems Networks

Security Considerations for Control Systems Networks

Manufacturers are realizing that to stay competitive, their Automation and Control Systems
need to be more integrated within their plant. The systems often need to be integrated with
upstream Enterprise Data Systems, and even further integrated to allow information to be
accessible across multiple plants, or even through the Internet. This convergence of the IT
world with the Automation World creates challenges in maintaining secure systems and
protecting your investments in processes, personnel, data and intellectual property.

While Automation Networks and Systems have built-in password protection schemes, this
is only one very small step in securing your systems. Automation Control System Networks
need to incorporate data protection and security measures that are at least as robust as a
typical business computer system. We recommend that users of PLCs, HMI products and
SCADA systems perform your own network security analysis to determine the proper level
of security required for you application. However, the Department of Homeland Security’s
National Cybersecurity and Communications Integration Center (NCCIC) and Industrial
Control Systems Cyber Emergency Response Team (ICS-CERT) has provided direction
related to network security and safety under an approach described as “Defense in Depth”,
which is published at https://www.us-cert.gov/sites/default/files/recommended_practices/

NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf.

This comprehensive security strategy involves physical protection methods, as well as process
and policy methods. This approach creates multiple layers and levels of security for industrial
automation systems. Such safeguards include the location of control system networks behind
firewalls, their isolation from business networks, the use of intrusion detection systems,
and the use of secure methods for remote access such as Virtual Private Networks (VPNs).
Further, users should minimize network exposure for all control system devices and such
control systems and these systems should not directly face the internet. Following these
procedures should significantly reduce your risks both from external sources as well as internal
sources, and provide a more secure system.

It is the user’s responsibility to protect such systems, just as you would protect your computer
and business systems. AutomationDirect recommends using one or more of these resources in
putting together a secure system:

• ICS-CERT’s Control Systems recommended practices at the following web address:

https://ics-cert.us-cert.gov/Recommended-Practices

• Special Publication 800-82 of the National Institute of Standards and Technology – Guide to
Industrial Control Systems (ICS) Security

https://csrc.nist.gov/publications/detail/sp/800-82/rev-2/final

• ISA99, Industrial Automation and Control Systems Security

http://www.isa.org/MSTemplate.cfm?MicrositeID=988&CommitteeID=6821

(please note this is a summary and these standards have to be purchased from ISA )

The above set of resources provides a comprehensive approach to securing a control system
network and reducing risk and exposure from security breaches. Given the nature of any
system that accesses the internet, it is incumbent upon each user to assess the needs and
requirements of Security Considerations for Control Systems Networks their application,
and take steps to mitigate the particular security risks inherent in their control system.

1

B

C

4

5

6

7

8

9

10

11

12

13

14

A

B

C

D

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index

A

Additional Optimization, 5–8

Agency Approvals, 1–7

Automatic Read Feature, 5–2

for a device not configured in the Automatic Read table, 5–3
for a device within the Automatic Read table, 5–6

C

Conventions Used, 1–4

D

Dimensional Drawing, 2–5

Dip Switch Information, 2–4

F

Firmware Updates, 4–11

Function Codes Supported, 3–6

I

Introduction, 1–2

M

MB-GATEWAY Configuration, 3–4

Modbus Error Codes, B–2

Mounting / Clearance Information, 1–6

DIN Rail Mounting, 1–7
Direct Mounting, 1–6

N

NetEdit Configuration, 3–5

P

Parameters, 4–2

Gateway Device Status Page, 4–8

Automatic Reads, 4–9
Last Modbus RTU Request, 4–10
Last Modbus TCP Request, 4–9

Status Information, 4–10
Gateway Modbus ID, 4–3
Home Page, 4–2
IP Setup Configuration Page, 4–5
Module Name and Module Description, 4–4
Serial Port Configuration Page, 4–6
Setup Slave Timeout / Retries Page, 4–7

Product Overview, 1–5

S

Safety Guidelines, 3–2

Security Considerations for Control Systems Networks, C–2

Specifications, 2–2

Index

T

Technical Support, 1–3

U

Using Modbus Poll to MB-GATEWAY with CLICK Slave, A–11

Step 1: Connect the MB-GATEWAY serial port to Port 3 of the CLICK PLC., A–11
Step 2: Configure the CLICK serial port and MB-GATEWAY serial port., A–12
Step 3: Connect to the MB-GATEWAY using the Modbus Poll simulator software., A–18

Using Modbus Poll to MB-GATEWAY with DL06 Slave, A–2

Step 1: Connect the MB-GATEWAY serial port to the DL06 secondary communications port., A–2
Step 2: Configure the DL06 PLC serial port and MB-GATEWAY serial port., A–3
Step 3: Connect to the MB-GATEWAY using the Modbus Poll simulator software., A–7

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Using P3000 as Master (Client) to MB-GATEWAY with CLICK Slave, A–24

Step 1: Connect CLICK to the MB-GATEWAY as shown in example 2., A–24
Step 2: Connect P3000 CPU (P3-550) to MB-GATEWAY via Ethernet Switch and Two Ethernet Cables., A–24
Step 3: Configure the MRX instruction to read data from the MB-GATEWAY., A–28

W

What’s in the Box, 1–6

Wiring Diagrams, 3–3

Index

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