Get IP address of compactlogix programmatically

Paul_Pereira · Jan 31, 2023

Hi Guys,

I'm trying to get the IP address of my L33ER Compactlogix to show up on my PV+ 600. I know about answer 26779 and have tried it but I think this solution does not work with the L33ER. Is there another way of getting the IP address from the controller, perhaps similar to how we use GSV to get the ProductRev or wallclock time of the controller?

JeremyM · Jan 31, 2023

Paul_Pereira said:
Hi Guys,

I'm trying to get the IP address of my L33ER Compactlogix to show up on my PV+ 600. I know about answer 26779 and have tried it but I think this solution does not work with the L33ER. Is there another way of getting the IP address from the controller, perhaps similar to how we use GSV to get the ProductRev or wallclock time of the controller?

You will need to set up a message to GetAttributeSingle from CIP class 0xF5, instance 1, attribute 5. The first DWORD (DINT) returned is the IP address and each byte within represents an octet of the address.

You could COP the returned value into an array of SINT[4] and then extract and condition each into a DINT, then use the DTOS and CONCAT functions to build the textual form.

Because the L33 doesn’t work with USINT, you’ll need to test each SINT in the array for being negative and add an offset when assigning to the DINT.

Here’s an example of the straightforward USINT conversion:
https://github.com/JeremyMedders/LogixLibraries/blob/main/src/Numeric/Num_IPv4toStr_AOI.L5X

Paul_Pereira · Jan 31, 2023

JeremyM said:
You will need to set up a message to GetAttributeSingle from CIP class 0xF5, instance 1, attribute 5. The first DWORD (DINT) returned is the IP address and each byte within represents an octet of the address.

You could COP the returned value into an array of SINT[4] and then extract and condition each into a DINT, then use the DTOS and CONCAT functions to build the textual form.

Because the L33 doesn’t work with USINT, you’ll need to test each SINT in the array for being negative and add an offset when assigning to the DINT.

Here’s an example of the straightforward USINT conversion:
https://github.com/JeremyMedders/LogixLibraries/blob/main/src/Numeric/Num_IPv4toStr_AOI.L5X

Perhaps I wasn't clear. I already know about and have tried answer 26779 which is exactly what you are also trying to say. It does not work for the compactlogix L33ER. It will just return 16#00 for each octet. Is there another way?

AlfredoQuintero · Jan 31, 2023

Paul, what is "Answer 26779"? is this another post? Can you post the link for the post?
Can you also show a screenshot of your program?

Paul_Pereira · Jan 31, 2023

Not working on L33ER

I'm referring to the techconnect article which exaplaints how to perform the taxk with messaging. You can find it here: https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/26779

These screenshots are what I am doing at present (attached):

Logic.png - my code
Return.png - what the SINT is returning.

JeremyM · Jan 31, 2023

The message indicates an error status, so you won't be seeing anything else but zeros where there should be payload data.

Can you screenshot the Message config?

Paul_Pereira · Jan 31, 2023

I've attached the message config here. What is causing the error?

plvlce · Jan 31, 2023

A screenshot of your MSG configuration might be more helpful than one of the logic calling it.

Based on your screenshot the MSG is not 'returning' 16#00 -- it is erroring out rather than completing. Check what the error message is.

EDIT: 'Connection failure' suggests that your communication path is not set correctly.

JeremyM · Jan 31, 2023

Paul_Pereira said:
I've attached the message config here. What is causing the error?

Make sure your path is hitting the correct rack slot (of the ENxT). Slots are zero-indexed.

AlfredoQuintero · Jan 31, 2023

The solution in the Rockwell technote is similar to the one I suggested in link below the other day.
https://www.plctalk.net/qanda/showpost.php?p=932827&postcount=3

Paul_Pereira · Jan 31, 2023

Thanks guys it finally worked. It was not hitting the right slot. My problem now is this. I managed to DTOS to 4 separate strings, namely "192" "168" "10" and "2". However I am not sure how to concat them with a dot in between the 4 strings. If I concat directly I get 192168102. But I need to see the dots in between.

JeremyM · Jan 31, 2023

Make a separate string containing the dot.

Paul_Pereira · Jan 31, 2023

JeremyM said:
Make a separate string containing the dot.

Noted, is it possible to join 7 strings in one instruction instead of joining 2 at a time?

joseph_e2 · Jan 31, 2023

I've used a MSG instruction in an L33ER before and it worked. The screenshot in post 7 matches what I have. On the communication tab of the MSG configuration, click "Browse..." and drill down to the 1769-L33ER below the Ethernet node and click OK. When you "Apply" the change in the communication tab, it will change the path to "THIS". You should get a result that you can then parse out.

JeremyM · Jan 31, 2023

Paul_Pereira said:
Noted, is it possible to join 7 strings in one instruction instead of joining 2 at a time?

No, but there’s a way to loop (see my earlier link).

Get IP address of compactlogix programmatically

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