# Unable to write to OPC tag **URL:** \ **Category:** General Discussion\ **Created:** [October 9, 2020, 1:45am UTC](https://forum.inductiveautomation.com/t/unable-to-write-to-opc-tag/39524 "2020-10-09T01:45:46Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![santoshb189](https://avatars.discourse-cdn.com/v4/letter/s/74df32/32.png) [@santoshb189](https://forum.inductiveautomation.com/u/santoshb189)\ **Post date:** [October 9, 2020, 1:45am UTC](https://forum.inductiveautomation.com/t/unable-to-write-to-opc-tag/39524/1 "2020-10-09T01:45:46Z")
I am using SLC program from Ignition for simulation. I have created test tags and mapped them to N7/N7:0,1,2… I am able to read values from these tags but unable to write values and also communication is both read and write. Is there any setting that needs to be changed? ![test1](https://us1.discourse-cdn.com/inductiveautomation/original/3X/a/1/a1743c80081067685a8bfac12ef28f3e35089acd.png) ---
**Author:** ![bpreston](https://avatars.discourse-cdn.com/v4/letter/b/4af34b/32.png) [@bpreston](https://forum.inductiveautomation.com/u/bpreston)\ **Post date:** [October 9, 2020, 1:21pm UTC](https://forum.inductiveautomation.com/t/unable-to-write-to-opc-tag/39524/2 "2020-10-09T13:21:25Z")
How are you trying to write to it? Are you writing through the tag browser or through a component? If though a component is Bidirectional enabled for the binding? ---
**Author:** ![santoshb189](https://avatars.discourse-cdn.com/v4/letter/s/74df32/32.png) [@santoshb189](https://forum.inductiveautomation.com/u/santoshb189)\ **Post date:** [October 10, 2020, 1:11am UTC](https://forum.inductiveautomation.com/t/unable-to-write-to-opc-tag/39524/3 "2020-10-10T01:11:33Z")
I tried to write through a component(multi state button) - bidirectional is enabled. This didn’t work. So, I have tried writing directly from tag browser and it didn’t work neither.