# OPC-UA AB ST Data file problem **URL:** \ **Category:** Ignition\ **Created:** [July 14, 2010, 12:31pm UTC](https://forum.inductiveautomation.com/t/opc-ua-ab-st-data-file-problem/2033 "2010-07-14T12:31:32Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![david\_mccutchen](https://avatars.discourse-cdn.com/v4/letter/d/919ad9/32.png) [@david\_mccutchen](https://forum.inductiveautomation.com/u/david_mccutchen)\ **Post date:** [July 14, 2010, 12:31pm UTC](https://forum.inductiveautomation.com/t/opc-ua-ab-st-data-file-problem/2033/1 "2010-07-14T12:31:32Z")
ST files from the PLC5 driver do not display correctly with a null value in the string. Sometimes they will show nothing. For example: ` PLC string- 234036X01A01\00 -- this will not display the last value of "1", I am guessing because of the "\00" null. Sometimes this value will just show "null"` ---
**Author:** ![david\_mccutchen](https://avatars.discourse-cdn.com/v4/letter/d/919ad9/32.png) [@david\_mccutchen](https://forum.inductiveautomation.com/u/david_mccutchen)\ **Post date:** [July 16, 2010, 12:35pm UTC](https://forum.inductiveautomation.com/t/opc-ua-ab-st-data-file-problem/2033/2 "2010-07-16T12:35:21Z")
Anyone had a chance to look into this? ---
**Author:** ![thechtman](https://avatars.discourse-cdn.com/v4/letter/t/e56c9b/32.png) [@thechtman](https://forum.inductiveautomation.com/u/thechtman)\ **Post date:** [July 16, 2010, 5:24pm UTC](https://forum.inductiveautomation.com/t/opc-ua-ab-st-data-file-problem/2033/3 "2010-07-16T17:24:28Z")
I am able to reproduce the same problem here, but I haven’t had a chance to fix it. I will have it fixed early next week. ---
**Author:** ![david\_mccutchen](https://avatars.discourse-cdn.com/v4/letter/d/919ad9/32.png) [@david\_mccutchen](https://forum.inductiveautomation.com/u/david_mccutchen)\ **Post date:** [July 16, 2010, 5:56pm UTC](https://forum.inductiveautomation.com/t/opc-ua-ab-st-data-file-problem/2033/4 "2010-07-16T17:56:07Z")
Thanks, let me know when you have it done ---
**Author:** ![thechtman](https://avatars.discourse-cdn.com/v4/letter/t/e56c9b/32.png) [@thechtman](https://forum.inductiveautomation.com/u/thechtman)\ **Post date:** [July 21, 2010, 12:21am UTC](https://forum.inductiveautomation.com/t/opc-ua-ab-st-data-file-problem/2033/5 "2010-07-21T00:21:59Z")
Ok, it is fixed in 7.1.4 that is on the download page of our website. ---
**Author:** ![david\_mccutchen](https://avatars.discourse-cdn.com/v4/letter/d/919ad9/32.png) [@david\_mccutchen](https://forum.inductiveautomation.com/u/david_mccutchen)\ **Post date:** [July 21, 2010, 2:40pm UTC](https://forum.inductiveautomation.com/t/opc-ua-ab-st-data-file-problem/2033/6 "2010-07-21T14:40:25Z")
Ok the null problem is fixed, but there is something stange. I have several string file tags. Any string tag that is referenced to “3” will not read the data. For example ST80:3, ST81:3, ST60:3, etc. ST80:2 will display fine. Have not tried all combinations, only know that “3” will not work for any file. If you put ST60:3.STR it will display, but I don’t have to specify this for the others. ---
**Author:** ![thechtman](https://avatars.discourse-cdn.com/v4/letter/t/e56c9b/32.png) [@thechtman](https://forum.inductiveautomation.com/u/thechtman)\ **Post date:** [August 4, 2010, 6:21pm UTC](https://forum.inductiveautomation.com/t/opc-ua-ab-st-data-file-problem/2033/7 "2010-08-04T18:21:23Z")
Just for an update on this issue. The problem applies to SLC, MicroLogix and SLC processors and has been resolved in version 7.1.4 ---
**Author:** ![chris\_d\_sanders](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/chris_d_sanders/32/3359_2.png) [@chris\_d\_sanders](https://forum.inductiveautomation.com/u/chris_d_sanders)\ **Post date:** [August 19, 2010, 4:48am UTC](https://forum.inductiveautomation.com/t/opc-ua-ab-st-data-file-problem/2033/8 "2010-08-19T04:48:42Z")
For David and I, it was not in a SLC, it was a PLC5