Connection Issues

[Jeffrey2659]

Preflight checks

Before you post an issue, ensure you have tried the minimal examples within the repo, or tried the pylogix-tester.

• [ X] Have you tried the examples?
• [X] Have you tried pylogix-tester?
• [X ] Have you read previous issues?
• [X ] Is this a supported Rockwell PLC?

Type of issue

• [ ] Bug
• [ ] Feature Request
• [ ] Question
• [X ] Other

Delete items that do not apply below.

Description of issue

I am not able to read a tag from the PLC, even though all criteria's are seemingly met

Expected behavior

I am expecting Compressor Running to return CompressorSelect False Success

Actual behavior

CompressorSelect None Unknown error timed out

Code

from pylogix import PLC

Setup the PLC object with initial parameters

Change to your plc ip address, and slot, default is 0, shown for clarity

comm = PLC('192.168.10.2', 0)

Read returns Response class (.TagName, .Value, .Status)

ret = comm.Read('CompressorSelect') print(ret.TagName, ret.Value, ret.Status)

Close Open Connection to the PLC

comm.Close()

Please provide a minimal, reproducible example.

https://stackoverflow.com/help/minimal-reproducible-example

Screenshots

Stacktrace

Versions

Include versions to

• pylogix:1.0.1
• plc model: CompactLogix 1769 L30ERM
• python:3.12.4
• OS: Windows

[dmroeder]

They tester says "PLC is unreachable" and pylogix is not reaching the PLC.

What happens if you PING the PLC? Post the results of ipconfig in the command prompt.

[TheFern2]

From the screenshot it looks like one Ethernet adapter is on 192.168.0.X

Ping will 100% fail since the tester is using the ping module. You only get that error if the ping fails.

Wondering if you need some routing path in which case tester might not be up to date for routing.

[Jeffrey2659]

I have attached the screenshot here. I also forgot to mention that the ip addresses studio 5000 is running is on a VM, if that makes a difference.

[TheFern2]

It looks like you should be able to ping the plc from the vm, did you run tester from VM? You won't be able to ping plc unless you change your PC ip to 192.168.10.X, that's if you want to run script from your PC. Also it doesn't matter if rslogix is running or not for pylogix to work.

[Jeffrey2659]

I am able to ping from VM. I do want to ping from PC, but instead of changing the PC ip to match the VM, could I change VM ip to match the PC's?

[TheFern2]

What does your vm network settings look like? (Screenshot) also ipconfig from your PC

If you change the vm to match pc you won't be able to ping the plc anymore.

Might be faster if you join the discord server https://discord.gg/tw8E9EAAnf and post in help channel

[Jeffrey2659]

Got it resolved, but it was probably not the best way. I changed the ip of my vm, and then changed the ip of the plc using a usb. I was able to ping the plc from the pc then using the usb. The issue was the host was on a different gateway than the vm and plc as the @TheFern2 mentioned. Thank you guys for helping me diagnose and solve the issue

[dmroeder]

Thanks for the update. I'm a fan of VM's but they do add an extra layer of complexity.

[TheFern2]

You can always use another external Ethernet adapter on pc too if you must have pc on 0.X and extra one can be on 10.X

Glad you found a solution.