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The Do More PLC, P2P, Modbus scanner communication within the Domore designer software offers
a powerful and streamlined solution for your integrated modbus devices into your PLC system
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With its advanced features and seamless integration capabilities, this modbus application empowers
you to unlock new levels of efficiency and productivity in your industrial automation applications
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A peer-to-peer P-to-P service is a decentralized platform whereby two individuals
interact directly with each other without intermediation by a third party
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One of the key advantages of the Duhmore-PLC ModBus scanner communication is its
ability to establish peer-to-peer for P-to-P communication with Modbust devices
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This means the module can directly communicate with Modbust
devices on the same network without a supervisory control system
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This streamlined communication process allows for faster data exchange
and reduces the complexity of the overall system architecture
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We will demonstrate how the Do More Designer
simulator PLC communicates with the BRX-Dermore PLC
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This will be done via the ModBus IOS scanner in the programming software.
The Modbus TCP protocol will read and write 100 discrete bits and registers
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Let's get started. Detailed information
contained in this video can be found at
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ACC Automation.ca. A link has been put in the
description below. If you have not watched the other
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videos yet, there'll be links in the description
below that will start you at video one. There'll be
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links to the rest of the videos in the series as
well. What is Modbus? Modbus is a communication
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protocol widely used in industrial applications
due to its simplicity and efficiency. The media
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or wiring used depends on the actual
type of Modbus protocol used. Serial
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communication will usually use RS 232 or RS-45
media. This Modbus protocol is RTU or ASCII
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All devices must have the same wiring and
Modbus protocol before communication can occur
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Ethernet communication will use an RJ45 media. The CAT Ethernet
cable used will depend on the actual network and location
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Modbus TCP protocol is used on this network. Mudbus
is a master or client to slave server protocol
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In a serial environment, there can only be one master or client.
The slaves or servers will respond only when the data is requested
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In an Ethernet environment, the client server works the same way.
However, because of the OSI physical model, multiple clients can be used
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This ensures that when multiple commands are
received simultaneously, they are handled in order
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What are Modbus Addresses? Four types of addresses
Reference in Modbus devices are coil, discrete output
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discrete input or status input, input, input register, and
holding register. It is important to find out the Modbus addresses
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that are available at all of the
slave or server units on your network
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The DoMore series of PLCs use a
fixed dedicated modbust memory area
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This can be seen in the following chart. In our example, we will
read and write 100 discrete bits of information and 100 registers
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Using the Do More Modbus registers, we will read 100
MI discrete input contacts and 100 MIR input registers
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We will also write 100 MC discrete output coils and 100 MHR output coils. output holding
registers. This is all from the Modbus TCP client PLC, which is the PLC simulator
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Programming the Modbus Server PLC We will start with programming the Modbus server PLC This is the physical VX BRX
PLC Start the Do More Designer software Ensure that the PLC is powered up and connected using an Ethernet cable
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Select the online icon on the main ribbon menu.
The Select PLC connection window will be displayed
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All devices that can be connected will automatically be displayed.
You will see our PLC IP address and physical Mac address
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If you're unsure if this is the controller you want
to program, select the blink and refresh button
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This will blink the air LED on
the CPU yellow for 15 seconds
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A warning message will appear. Select
Yes to start flashing the CPU LED
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Once we verify that we have the correct PLC to program, we will go to
the Edit mode and place an end statement instruction for our logic
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Select System configuration from the main menu,
PLC, or under the Tools menu in the project browser
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The system configuration window will now be displayed. This will show you
the IP address and ensure that we have selected the Modbus TCP Server option
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option for this PLC. Transfer and save
the ModBus Server PLC setup and program
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You know, Programming the Modbus Client PLC
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We can now program our ModBus TCP client PLC. This is the
controller that will handle all the communication on the network
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Select the new icon on the main menu ribbon
of the DoMore Designer programming software
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The new offline project window would be displayed.
Select the DoMore simulator and aim the project
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Like the server PLC, we will have an end
statement for our ladder logic program
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Select the Do icon on the main menu ribbon This will start the Do Sim simulator The
PLC simulator will run independently of the Domore designer programming software
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Returning to the programming software, we can select the right PLC icon
on the main menu ribbon. This will transfer our program to the simulator
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Select system configuration from the main menu
PLC or under the Tools menu in the project browser
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The system configuration window will now be displayed
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This will show you the IP address. The IP address will
be the same as the computer running the PLC simulator
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Select Modbus I.O. Scanner under the
I.O. Configuration menu on the left side
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Select Enable Modbus I.O. Scanner.
This will allow us to use the
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the scanner. On the right side of the window
you will see two options. Add device from
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profile will show you devices that have been
pre-programmed so you can communicate with
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different equipment. We demonstrated this before when communicating with the solo
process temperature controller. Select the add blank device. Enter the IP address of the
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server PLC. We will also change the read
and write intervals to the minimum time
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This is 1 millisecond. Select AddCom
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Select the read inputs and then select the
Add field button. Set the bit count to 100
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We can now specify where we
want to put the data. Enter MI1
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We can now enter MI1. the other communication fields
for our Modbus scanner. Read inputs 1-001 to 101-100
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and store an MI-1 to MI-100, write coils, 0-0-001 to 0-1-00
from MC1 to MC-100, read input registers 3-0-1-301 to 301-1-1-1
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and store it MIR 1 to MIR 100 and
write registers 4,001 to H.R.1
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From MHR 1 to MHR 100. Once we
have all the data, select OK
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A message warning will be displayed indicating
that the system configuration has changed
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Select OK and download the program to the Client
PLC simulator. P-to-P Modbus TCP communication
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Ensure that both the PLC and simulator are running. We can now
monitor the P-to-P Modbus TCP communication by monitoring the scanner
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Call the Modbus scanner monitor by
selecting it from the main menu debug
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The Modbus scanner monitor will show you the bit flags errors and counts This will help to ensure that communications are
working correctly Once the communications have been established we can now go ahead and test the information being exchanged
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We can test our network and the information being
exchanged using the data view option of each of the PLCs
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Here's the Do More Server Data View window. We will see
that we have monitored the first five bits and registers
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So, you know Academy. Here's
a new more client data view
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We're marking the same 5 bits and registers
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As we change the server bits MI1
to MI5 and registers MIR1 to MIR5
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they will see in the client bits MI1
to MI5 and registers MIR1 to MIR5
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As you change the client bits MC1
to MC5 and register MHR1 to MHR5
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they will be seen in the server bits
MC1 to MC5 and registers MHR1 to MHR5
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The DumaR PLC P2P Modbus scanner communication provides a
versatile and adaptable solution for your communication needs
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It offers seamless integration with the DUMOR PLC platform, allowing you to leverage
the full capabilities of your PLC system for your Modbus communication requirements
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This Modbus scanner integration simplifies configuration and setup,
making it easy to get up and running quickly with Modbus devices
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questions about the video, please leave a comment below and I'll do my best
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Thanks so much for watching. I'll
see you next time. Stay safe
