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Mastering Modbus TCP/IP Network Communication

Learn how to design, build and troubleshoot Modbus TCP/IP client-server networks
Instructor:
Emile Ackbarali
4,701 students enrolled
English [Auto]
Understand Network Layering as it applies to Modbus TCP/IP
Understanding and Configuring IP Addresses on Modbus TCP/IP compliant devices
Be able to Recognize and Interpret Modbus TCP/IP Data Streams
Use Modbus Simulation Tools to simulate a simple Modbus TCP/IP Client-Server network
Use Modbus Software to Troubleshoot Modbus TCP/IP Networks
Configure a Programmable Logic Controller for Modbus TCP/IP Communication
Create an actual physical Modbus TCP/IP Network System

If you deal with Automation and Process Control equipment, chances are that you are very familiar with terms like RS232, RS485, 4-20mA, DI, DO, AI and on and on. However, standards in Information Technology have been making their way into the fields of Automation and Process control. Modbus falls into that category as well. 

Modbus has traditionally been used on RS485 networks. However, Modbus TCP/IP has gained in popularity and is being implemented more and more. Here is where the challenge exists. As a tech or engineer in the automation field, in order to implement, maintain and troubleshoot Modbus TCP/IP networks, you will need to know about certain technologies in the field of IT work. The latter can be a BIG challenge since the field of IT is so expansive and you don’t have the time to learn all of it.

That is what this course is for.

In this course, I am going to take your existing knowledge of Modbus RTU, combine it with what you need to know from the world of IT and give you all that you need to build, maintain and troubleshoot Modbus TCP/IP networks. And I am going to do that in the shortest possible time and in the most practical way that I know

Introduction

1
Prerequisite

Prerequisite knowledge of Modbus RTU protocol.

2
Accessing Attached Resources and Setting Optimal Video Resolution
3
Plan of Attack

Overview of the course sections.

Network Layering

1
Why we need to Understand Network Layering

An understanding of Network Layering is essential to grasp why Modbus is able to use TCP/IP for communication.

2
A Network Layering Analogy Scenario

We look at a real world transportation scenario that can be used to understand Network Layering.

3
Properties of the Network Layering Analogy Scenario

Properties of the Network Layering Analogy Scenario that will exist in Modbus TCP/IP.

4
A View into the Internal Software Modules that support Network Layering

A View into the Internal Software Modules that support Network Layering

5
The TCP/IP Software Module within Modbus TCP/IP devices

We look at how layering is used to understand where the TCP/IP software module fits in a device.

6
Change from Master/Slave to Client/Server

We see how the terms client and server take the place (respectively) of master and slave.

7
Change in Network Representation

We use a cloud icon to represent the inherent complexity of a TCP/IP network.

8
Ethernet is a Major Component of Modbus TCP/IP

Ethernet is a Major Component of Modbus TCP/IP

9
The Layers within a TCP/IP Software Module

4 Layers that comprise the TCP/IP stack.

10
Interconnection via Ethernet Hardware

How network devices are physically interconnected via Ethernet hardware.

11
PLC Example - Revised Interconnection Scheme

PLC Example revised Interconnection Scheme

Modbus TCP/IP Characteristics

1
Main Properties of Modbus TCP/IP

We look at 3 main properties of Modbus TCP/IP that cannot be supported on Mobus RS485.

2
Simultaneous Query Response Cycles on Modbus TCP/IP

Simultaneous Query Response Cycles on Modbus TCP/IP

IP Addressing

1
Unit ID and IP Address

Unit ID is supplanted by IP Address on TCP/IP networks.

2
Why IP Addressing is used on TCP/IP Networks

The lecture explains why the IP address must be used on a Modbus TCP/IP network as opposed to the Unit ID.

3
Format of an IP Address

Examines the DOT notation used in IP Addresses

4
Example IP Addressing on a TCP/IP Network

A look at the addresses of a number of devices on a network.

5
Port Numbers

A look at the functions of Ports in TCP/IP.

6
Modbus Application Port Assignment

How Modbus uses port 502 for communications.

Ethernet

1
Ethernet as a Physical Layer Technology

A look at Ethernet while touching on network arbitration.

2
Network Arbitration

Comparison of network arbitration between RS485 and Ethernet.

3
Ethernet's Network Arbitration Method

A look at Carrier Sense Multiple Access / Collision Detection.

4
Layering and Abstraction

Looking at layering again with the new knowledge of Ethernet.

Modbus TCP/IP Query-Response Cycle

1
Introduction and Prerequisite Reminder

Reminder of having a good working knowledge of standard Modbus.

2
Standard Modbus TCP/IP Data Frame

A look at the difference between the standard Modbus data frame and that which is used in Modbus TCP/IP.

3
Modbus TCP/IP Data Frame Naming Convention

We look at the names of the different parts of the Modbus TCP/IP data frame.

4
MBAP Header Functions - Part 1

A look at the MBAP header and what the various parts are for.

5
MBAP Header Functions - Part 2

A look at the MBAP header and what the various parts are for.

6
Construction of a TCP/IP-Ethernet Data Packet

A look at how frames are added to the Modbus ADU.

7
Client Server Example Scenario

We look at a network with one Modbus TCP/IP client and two Modbus TCP/IP servers.

8
The Read Input Registers Query Data Stream

The Read Input Registers Query Data Stream

9
The Read Input Registers Response Data Stream

The Read Input Registers Response Data Stream

10
Additional Note on Transaction Identifier

How the transaction identifier changes with every query response cycle.

Modbus TCP/IP Simulations

1
Basic Guidelines

Basic guidelines for section.

2
Identifying the Modbus Software Tools

The 2 Modbus software tools are identified are their purposes given.

3
Downloading the Modbus Software Tools

This lecture identifies the websites from which the Modbus software tools can be downloaded.

4
Introduction to Modscan32

This lecture introduces the Modbus Master simulator known as Modscan32. 

5
Introduction to Modsim32

This lecture introduces the Modbus Slave simulator known as Modsim32. 

6
IPCONFIG command to determine IP Address

Using the ipconfig command to get ip address of the computer.

7
Connecting Modbus Simulators via TCP/IP

How Modscan32 and Modsim32 work as Modbus TCP/IP Simulators

8
Simulating the Read Input Registers Command

Simulating the Read Input Registers Command.

9
Data Traffic for the Read Input Registers Command

Data Traffic for the Read Input Registers Command.

10
Simulating the Read Input Status Command

Simulating the Read Input Status Command

11
Data Traffic for the Read Input Status Command

Data Traffic for the Read Input Status Command

12
Simulating the Read Holding Registers Command

Simulating the Read Holding Registers Command

13
Data Traffic for the Read Holding Registers Command

Data Traffic for the Read Holding Registers Command

14
Simulating the Read Coils Status Command

Simulating the Read Coils Status Command

15
Data Traffic for the Read Coils Status Command

Data Traffic for the Read Coils Status Command

16
Modbus Write Commands

Modbus Write Commands

17
Downloading the CAS Modbus Scanner

Downloading the CAS Modbus Scanner

18
Viewing Data Traffic in Hexadecimal Format

Viewing Data Traffic in Hexadecimal Format

19
Simulating the Force Single Coil Command

Simulating the Force Single Coil Command

20
Simulating the Preset Single Register Command

Simulating the Preset Single Register Command

Configuring the DL05 PLC for Modbus TCP/IP Communication

1
Introduction

Introduction

2
Overview of the Direct Logic 05 PLC

Overview of the Direct Logic 05 PLC

3
The 2 Steps to Configuring Modbus on a Physical Device

The 2 Steps to Configuring Modbus on a Physical Device

4
Looking at the Direct Logic PLC on my desk

Looking at the Direct Logic PLC on my desk

5
Configuration of IP Address on my laptop

Configuration of IP Address on my laptop

6
Using the NetEdit3 Configuration Software to configure Modbus

Using the NetEdit3 Configuration Software to configure Modbus

7
Direct Logic 05 Documentation for Modbus Memory Map

Direct Logic 05 Documentation for Modbus Memory Map

8
Using Modscan32 to Read/Write for Coils

Using Modscan32 to Read/Write for Coils

Bonus Section - How to Always get the Lowest Prices for my Courses

1
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Mastering Modbus TCP/IP Network Communication
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