# OPC tags not working in designer **URL:** \ **Category:** Ignition\ **Tags:** ignition79\ **Created:** [August 21, 2018, 2:46pm UTC](https://forum.inductiveautomation.com/t/opc-tags-not-working-in-designer/19345 "2018-08-21T14:46:48Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![f\_jerrym](https://avatars.discourse-cdn.com/v4/letter/f/e56c9b/32.png) [@f\_jerrym](https://forum.inductiveautomation.com/u/f_jerrym)\ **Post date:** [August 21, 2018, 2:46pm UTC](https://forum.inductiveautomation.com/t/opc-tags-not-working-in-designer/19345/1 "2018-08-21T14:46:48Z")
We have a server running version 7.9.0. any new opc tag I drag into designer does not work. what am I doing wrong. is there a limitation to the amount of tags on the server? ---
**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:** [August 21, 2018, 2:49pm UTC](https://forum.inductiveautomation.com/t/opc-tags-not-working-in-designer/19345/2 "2018-08-21T14:49:34Z")
There is no limitation, other than computational demand and OPC driver’s load factor for the situation. What exactly is the problem? ---
**Author:** ![f\_jerrym](https://avatars.discourse-cdn.com/v4/letter/f/e56c9b/32.png) [@f\_jerrym](https://forum.inductiveautomation.com/u/f_jerrym)\ **Post date:** [August 21, 2018, 2:52pm UTC](https://forum.inductiveautomation.com/t/opc-tags-not-working-in-designer/19345/3 "2018-08-21T14:52:59Z")
it does not matter if I drag a Boolean or an int into the tag browser anything new will not work. all the old connection paths is still working. even if I copy paste a bit or integer already in the tag browser it will say null in the status column ---
**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:** [August 21, 2018, 3:11pm UTC](https://forum.inductiveautomation.com/t/opc-tags-not-working-in-designer/19345/4 "2018-08-21T15:11:25Z")
I vaguely recall some OPC driver bugs from early v7.9 versions. Try disabling and re-enabling the OPC drivers involved, and if that doesn’t help, try disabling and re-enabled the OPC module itself. Or upgrade… (-: ---
**Author:** ![f\_jerrym](https://avatars.discourse-cdn.com/v4/letter/f/e56c9b/32.png) [@f\_jerrym](https://forum.inductiveautomation.com/u/f_jerrym)\ **Post date:** [August 21, 2018, 4:01pm UTC](https://forum.inductiveautomation.com/t/opc-tags-not-working-in-designer/19345/5 "2018-08-21T16:01:29Z")
![](https://us1.discourse-cdn.com/inductiveautomation/original/2X/e/e31d7a0ec61f240b239c16e43159beacfd755d45.png) why do these dates not match? ---
**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:** [August 21, 2018, 4:19pm UTC](https://forum.inductiveautomation.com/t/opc-tags-not-working-in-designer/19345/6 "2018-08-21T16:19:15Z")
Get off 7.9.0. There are a laundry list of bugs, but one of the most significant was one that affected 7.9.0-7.9.3 and caused _all_ scan class execution threads to get hung up in certain circumstances. ---
**Author:** ![f\_jerrym](https://avatars.discourse-cdn.com/v4/letter/f/e56c9b/32.png) [@f\_jerrym](https://forum.inductiveautomation.com/u/f_jerrym)\ **Post date:** [August 22, 2018, 1:12pm UTC](https://forum.inductiveautomation.com/t/opc-tags-not-working-in-designer/19345/7 "2018-08-22T13:12:15Z")
The reboot resolved the problems that the Ignition server was having regarding PLC tag communications and is acting normally again. ---
**Author:** ![JordanCClark](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/jordancclark/32/83362_2.png) [@JordanCClark](https://forum.inductiveautomation.com/u/JordanCClark)\ **Post date:** [August 22, 2018, 8:29pm UTC](https://forum.inductiveautomation.com/t/opc-tags-not-working-in-designer/19345/8 "2018-08-22T20:29:58Z")
> [@paul-griffith](#): > > Get off 7.9.0. +1. Glad you got it going, but upgrading will help keep it from happening again. No cost for you to go to 7.9.9, hot off the presses.