# Uncertain behavior of Siemens PLC tags in v7.9.3

**URL:** <https://forum.inductiveautomation.com/t/uncertain-behavior-of-siemens-plc-tags-in-v7-9-3/15341>\
**Category:** Ignition\
**Created:** [September 14, 2017, 2:43pm UTC](https://forum.inductiveautomation.com/t/uncertain-behavior-of-siemens-plc-tags-in-v7-9-3/15341 "2017-09-14T14:43:34Z")\
**Posts on this page:** 1\
**Showing post:** 10

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**Author:** ![zxcslo](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/zxcslo/32/61610_2.png) [@zxcslo](https://forum.inductiveautomation.com/u/zxcslo)\
**Post date:** [September 15, 2017, 3:45pm UTC](https://forum.inductiveautomation.com/t/uncertain-behavior-of-siemens-plc-tags-in-v7-9-3/15341/10 "2017-09-15T15:45:15Z")

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I had a similar problem a while back (can’t remember when), but it had to do with unsigned and signed bytes and integers…  
I think, that IA changed something with Siemens driver and I had to change my Shorts and Ints to Bytes and Words…

My RAMs are over 50 years old and it seems that they have a lot of dead cells… 🙂

EDIT: I found the post with my problem a year ago… mybe it’ll be of some help:  
[http://forum.inductiveautomation.com/t/siemens-s7-1500-tags-turn-green-after-adding-data/12133/2](http://forum.inductiveautomation.com/t/siemens-s7-1500-tags-turn-green-after-adding-data/12133/2)  
[http://forum.inductiveautomation.com/t/ignition-byte-tag-config-error/11320/15](http://forum.inductiveautomation.com/t/ignition-byte-tag-config-error/11320/15)

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