# Communications problems? **URL:** \ **Category:** General Discussion\ **Created:** [August 25, 2016, 12:47pm UTC](https://forum.inductiveautomation.com/t/communications-problems/12066 "2016-08-25T12:47:38Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![P11](https://avatars.discourse-cdn.com/v4/letter/p/a9adbd/32.png) [@P11](https://forum.inductiveautomation.com/u/P11)\ **Post date:** [August 25, 2016, 12:47pm UTC](https://forum.inductiveautomation.com/t/communications-problems/12066/1 "2016-08-25T12:47:38Z")
The Siemens devices I use are connected, and I have created about 1800 tags. I have got a problem now. If I create a new tag, the value is not taken. The green circle with a question mark appears next to the OPC tag icon. I do not know what to do, please help me. This happens also if I copy a tag which has its own value changing in real time. The new tag does not show any value. ---
**Author:** ![robby.tanner](https://avatars.discourse-cdn.com/v4/letter/r/c6cbf5/32.png) [@robby.tanner](https://forum.inductiveautomation.com/u/robby.tanner)\ **Post date:** [October 4, 2023, 2:57pm UTC](https://forum.inductiveautomation.com/t/communications-problems/12066/2 "2023-10-04T14:57:42Z")
I have this very same issue. S7-400 devices (might be the same for others)...no solution yet. ☹ ---
**Author:** ![robby.tanner](https://avatars.discourse-cdn.com/v4/letter/r/c6cbf5/32.png) [@robby.tanner](https://forum.inductiveautomation.com/u/robby.tanner)\ **Post date:** [October 4, 2023, 3:15pm UTC](https://forum.inductiveautomation.com/t/communications-problems/12066/3 "2023-10-04T15:15:23Z")
JUST managed to fix the problem. I put a number of tags in. The first one had an incorrect address (i.e. I had address as QXQ11.1 instead of simply QX11.1. Fixed the first one and all 3 fell in to place. It seemed odd that they stayed in that state (with the green question mark) rather than going to fault (which I think is the red circle with an X in it). It seemed to require disabling than re-enabling the PLC under Devices to get them to switch states, which makes me suspect something in Ignition. FYI, Running version: 7.9.4 (b2017082911) ---
**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\ **Post date:** [October 4, 2023, 4:08pm UTC](https://forum.inductiveautomation.com/t/communications-problems/12066/4 "2023-10-04T16:08:19Z")
> [@robby.tanner](#): > > 7.9.4 Ancient, buggy, and soon to be completely unsupported. You should at least upgrade to the last available v7.9, then start planning to move to v8.1. ---
**Author:** ![robby.tanner](https://avatars.discourse-cdn.com/v4/letter/r/c6cbf5/32.png) [@robby.tanner](https://forum.inductiveautomation.com/u/robby.tanner)\ **Post date:** [October 4, 2023, 4:17pm UTC](https://forum.inductiveautomation.com/t/communications-problems/12066/5 "2023-10-04T16:17:55Z")
Thanks for that! Is the migration from 7.x to 8.x involved....? ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [October 4, 2023, 4:19pm UTC](https://forum.inductiveautomation.com/t/communications-problems/12066/6 "2023-10-04T16:19:19Z")
It can be. Best done in a staging/testing environment. ---
**Author:** ![robby.tanner](https://avatars.discourse-cdn.com/v4/letter/r/c6cbf5/32.png) [@robby.tanner](https://forum.inductiveautomation.com/u/robby.tanner)\ **Post date:** [October 4, 2023, 4:31pm UTC](https://forum.inductiveautomation.com/t/communications-problems/12066/7 "2023-10-04T16:31:56Z")
Copy that!!! ---
**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\ **Post date:** [October 4, 2023, 4:52pm UTC](https://forum.inductiveautomation.com/t/communications-problems/12066/8 "2023-10-04T16:52:34Z")
[https://docs.inductiveautomation.com/display/DOC81/7.9+to+8.1+Upgrade+Guide](https://docs.inductiveautomation.com/display/DOC81/7.9+to+8.1+Upgrade+Guide)