Jump to content

How to communicate with Mitsubishi 485( fx2 series)


Interroga

Recommended Posts

If possible, show me an example of communication with the fx2n series through 485 media.

 

One important information: All blocks in toolbox have ? simbol for explain funtion block .But COM:Serial don't have a help in help glossary . My doubt is if this block have a internal checksum or is necessary put together inside the message?

 

Regards,

Link to comment
Share on other sites

What PLC are you using?

Have you setup the RS485 Communications in the hardware configuration?    Com - PLC Communications-Physical-Serial Com

       and then   Com- PLC Communications-Protocols - Modbus    

      Who is Master?   Slave?

Mitsubishi supports  Modbus, Have you set up the protocol in it?     Master or Slave?

Download the UniStream Example programs  from the download section -just below the UniLogic download.

Under Communications there are a couple of RS485 Examples  to help guide you. - General - Not Mitsubishi Specific.

 

Link to comment
Share on other sites

I use fx2 series, it not have a modbus, because it is legacy system in site my client.  I see examples , but not help me.

After , i discovered in message composer having a checksum , optional and there was information about this resource in help . 

 

I feel like a blind man walking on the street with a walking stick looking for information. kkkkk...

 

Thanks in advance for try help me.

Link to comment
Share on other sites

  • MVP 2021

This is not a trivial task.  And yes, the Help is currently a little light on the COM blocks.

You'll need to define exactly what data it is in the Mitsubishi you want.  Who will be the master - Visilogic or the Mitsubishi?

You'll need to get very familiar with this document:

FX Communication Protocol

It looks like in the Mitsubishi you can set D8120 to turn off the checksum.  Look at  chapter 6 of the manual.

Get a USB->485 converter and develop the strings you'll need using a terminal program- I like this one: Bray's Terminal

This is a much easier and faster way to figure out protocol strings.

Once you've got the strings you need, you can start to configure your COM:Protocol blocks.  Send a request to support@unitronics.com for direct help on this.

 

Joe T. 

 

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...