# C80 | CAN 3rd Party Devices Communication Drop **URL:** \ **Category:** Controls & Vision\ **Tags:** t-c-panels, can\ **Created:** [May 1, 2026, 8:10am UTC](https://community.br-automation.com/t/c80-can-3rd-party-devices-communication-drop/11117 "2026-05-01T08:10:32Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![kuma1p](https://avatars.discourse-cdn.com/v4/letter/k/FF8800/32.png) [@kuma1p](https://community.br-automation.com/u/kuma1p)\ **Post date:** [May 1, 2026, 8:10am UTC](https://community.br-automation.com/t/c80-can-3rd-party-devices-communication-drop/11117/1 "2026-05-01T08:10:32Z")
Hello Community We are using a third-party weight controller that communicates via CAN, connected through an X20IF1041-1 card. There are two interface cards in use. On the first card, 10 CAN devices (nodes 1–10) are connected. Occasionally, communication between nodes 3 to 10 is lost and does not recover even after a power cycle. Strangely, after 2–3 hours, the communication resumes on its own. I checked the logger but found no relevant entries. Could someone explain what might be causing this issue? ---
**Author:** ![marcusbnr](https://dub1.discourse-cdn.com/brcommunity/user_avatar/community.br-automation.com/marcusbnr/32/256_2.png) [@marcusbnr](https://community.br-automation.com/u/marcusbnr)\ **Post date:** [May 1, 2026, 12:29pm UTC](https://community.br-automation.com/t/c80-can-3rd-party-devices-communication-drop/11117/2 "2026-05-01T12:29:06Z")
Hi Priyank, Do you have a CAN reader device (something like [this](https://www.peak-system.com/products/hardware/external-pc-interfaces/pcan-usb/) for example)? I think it would be helpful to plug a reader in downstream and see if you can catch what happens when the communication drops. I’m wondering if you still see traffic from those nodes, and if those messages contain any error information. Unfortunately if the messages aren’t making it to the PLC, the PLC won’t be able to know what’s happening. One possibility is that the devices themselves have stopped communicating (e.g., due to a power failure). Another is that there’s an issue with the wiring such that they are communicating, but that communication isn’t reaching the PLC. I think it’s also possible for the CAN bus to be flooded with messages if too many devices try to talk at once, but I’m not sure why that would happen intermittently and I would expect a power cycle to have some effect, at least temporarily. ---
**Author:** ![kuma1p](https://avatars.discourse-cdn.com/v4/letter/k/FF8800/32.png) [@kuma1p](https://community.br-automation.com/u/kuma1p)\ **Post date:** [May 3, 2026, 9:32am UTC](https://community.br-automation.com/t/c80-can-3rd-party-devices-communication-drop/11117/3 "2026-05-03T09:32:03Z")
Hi Marcus Thank you for your reply Power cycle doesn’t have an effect every time. Sometime the communication becomes healthy but sometimes it doesn’t. Interesting part is we are getting the same error in one more machine and in that also node 3 to node 10 lose their communication. ---
**Author:** ![stephan.herbig](https://avatars.discourse-cdn.com/v4/letter/s/FF8800/32.png) [@stephan.herbig](https://community.br-automation.com/u/stephan.herbig)\ **Post date:** [May 4, 2026, 7:36am UTC](https://community.br-automation.com/t/c80-can-3rd-party-devices-communication-drop/11117/4 "2026-05-04T07:36:14Z")
Hello Priyank, you can restart the CAN slaves via a function block ([nxcomNmt()](https://help.br-automation.com/#/en/6/libraries%2Fasnxcom%2Ffbks%2Fnxcomnmt.html)). Could you please test this in case of an error? A quick tip: The X20IF1041-1 itself occupies node number 1. Therefore, you should assign node numbers 2-11 to the slaves. ![image](https://europe1.discourse-cdn.com/brcommunity/original/2X/d/d021f3f474b8f5c26f191a42ede6aca709111fb3.png) Regards Stephan ---
**Author:** ![kovarj](https://dub1.discourse-cdn.com/brcommunity/user_avatar/community.br-automation.com/kovarj/32/537_2.png) [@kovarj](https://community.br-automation.com/u/kovarj)\ **Post date:** [May 25, 2026, 6:11am UTC](https://community.br-automation.com/t/c80-can-3rd-party-devices-communication-drop/11117/5 "2026-05-25T06:11:57Z")
Hi @kuma1p have you found solution for your issue? ---
**Author:** ![kuma1p](https://avatars.discourse-cdn.com/v4/letter/k/FF8800/32.png) [@kuma1p](https://community.br-automation.com/u/kuma1p)\ **Post date:** [May 29, 2026, 9:50am UTC](https://community.br-automation.com/t/c80-can-3rd-party-devices-communication-drop/11117/6 "2026-05-29T09:50:59Z")
Apologies for Replying Late. The 3rd party Load cell controller was found to be faulty.