Jump to content

Reading memory addresses


JohnOKelly

Recommended Posts

I want to ship data to a SCADA system and I need to read the memory addresses for a list of required tags. For example:

image.png

 

How do I find the for x and y? In this example I know that x = 40 and y=42 as these were used in a different program but for future programs how do I locate these addresses?

 

 

Link to comment
Share on other sites

  • MVP 2023

Yes, I'm afraid you've done a lot of work going down a rabbit hole.  You don't have to do any mapping to get data into the Modbus Slave table.

If you go back and look at the screenshot I posted you'll see that structure tags are automatically assigned when you drop an I/O module.  If you go to the bottom of the UniLogic screen you'll see a tab labelled "IO" that shows all the tags. 

image.png.6c64e619617aa0b4c7629796f3585b0f.png

You can assign alias names that make more sense, but you can't change the names the system gave them.

It's just a matter of grabbing the one you want selecting it when you Add a New Operation.  That's where you assign it an address that Modbus can deal with.

Your original post indicated that you only wanted two pieces of data for your SCADA system so that's what I showed.

Joe T.

Link to comment
Share on other sites

Thank you Joe,

Ive implemented that change with the Add New Operational Batch which is a lovely feature. I havent worked on a tag based system before but I am getting fond of it. Nice jobs Unitronics. I see Siemens have recently changes their Step 7 to a tag based system, looks like you have started a trend.

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...