Sending large hex value via OPC tag

Ignition
1

Hi!

I have the hex value in the attachment: is it possible for the machine that generates (equipped with a PLC) it to send it to Ignition via an OPC tag?

Thanks
value_sample.txt (16.3 KB)

2

OPC UA supports byte arrays, so I'd think so.

3

What kind of PLC? What protocol?

You could stuff the value into a String and parse it on the Ignition side.

4

We're gonna use OPC UA. I don't know the details of the PLC at the moment.

Ok, so I could use a String tag...what's the size limit for this kind of tag?

5

There's no size limit on an OPC tag.

Ultimately the largest value you can send over OPC would be dictated by the connection details negotiated between client/server, but that usually ends up being multi-megabyte max size.

6

You wouldn't see any problem in sending a tag with that value then, correct?

7

Should be okay, only ~17k characters...

Not great if it's changing often but should be okay.

What's this for?

8

That should be the hexadecimal representation of a set of value the machine (a press) provides as output at the end of every cycle. It then needs to be converted into a readable format so we can use it to generate a chart of the force.