Jun 9, 2011

Delta HMI to PLC Modbus Communication Network

Delta HMI is compatible to communicate with PLC in Modbus and up to 32 PLC Can be connected in a network with HMI being the Master and the PLC as slaves. 

Today we will see the step-by-step details for configuring this type of Modbus network between PLC and HMI.

HMI to PLC Modbus Network in Delta:-

Here we will consider that there are 3 plc in the network as slaves and One HMI as Master. So we will set up a Modbus ASCII network of one HMI(master) with 3 PLC’s (slaves). 

The communication Protocol we are going to use in this network is 7, N,2 (Modbus, ASCII), 9600 bps. And the HMI as Master with the address as 0 and Slave PLC as addresses 1, 2, AND 3.

In Delta Pin 1 will be D+ and Pin 6 will be D-, so make the wiring accordingly.

Setting Up Communication between ScreenEditor and WPLSoft:-

To set up the communication we need to define some of the Communication Parameters both at the PLC and HMI sides. 

Open the WPL SOft and select a new project.
To set up the Modbus Communication open the communication Wizard and define the Data Length as 8, Parity as None and stop bit as 2, and baud rate as 9600 BPS. 

Also, define the slave address as 1 for the first PLC and 2 for the second, and 3 for the third. Rest all parameters will be same for other PLC also.

We have to define the same communication parameters on the HMI side. Open the Screen Editor and select the HMI model and in the Base Port controller select as Delta Controller ASCII. 

After this go to Option -- Configuration and select Com Port 2 and define the same communication settings as we did on PLC Side.

We have made a sample PLC and HMI program, which you can download below.

Delta HMI to PLC Modbus Communication Sample Program

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  1. I have read your post, it is very useful for newbie who can study the knowledge about communication between plc and hmi screen. This is a blog site where I can find a lot of knowledge about plc. However, not so many people write comment to your post. I hopefully your blog will be more popular
    Currently, I am distributing a device that is a combination of hmi and plc monitors called plc integrated monitors. Its price is much cheaper if you buy 1 plc and 1 hmi monitor. I think it will be useful for your work, it saves the cost for your system. Help you to be competitive in the market.
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  2. https://sites.google.com/site/automationtalk/delta-hmi-to-plc-modbus-communication-network
    Sir this one is not working

    1. Link updated. Thanks for letting us know.


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