# Problem with OPC tag

**URL:** <https://forum.inductiveautomation.com/t/problem-with-opc-tag/18667>\
**Category:** Ignition\
**Created:** [June 29, 2018, 6:35am UTC](https://forum.inductiveautomation.com/t/problem-with-opc-tag/18667 "2018-06-29T06:35:17Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![huyao](https://avatars.discourse-cdn.com/v4/letter/h/aeb1de/32.png) [@huyao](https://forum.inductiveautomation.com/u/huyao)\
**Post date:** [June 29, 2018, 6:35am UTC](https://forum.inductiveautomation.com/t/problem-with-opc-tag/18667/1 "2018-06-29T06:35:17Z")

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> [@Int1 & int2&int4& int8?](https://forum.inductiveautomation.com/t/int1-int2-int4-int8/6915/2):
>
> byte

Hi Kevin，

I got a problem that Byte in Siemens PLC is unsigned, however in Ignition, the opc tag will be showed in Int1, so the value greater than 128 will be error.  
Any ideas?

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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:** [June 29, 2018, 6:55am UTC](https://forum.inductiveautomation.com/t/problem-with-opc-tag/18667/2 "2018-06-29T06:55:08Z")

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In Tag Editor define Data Type as Short and Source Data Type as Byte and… voila… you have tag from 0 to 255.

 ![](https://us1.discourse-cdn.com/inductiveautomation/original/2X/6/6d2ad6d20c951e0ce9d1ea2d2b94453e0bf3148e.PNG)

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<div class="post-metadata">

**Author:** ![huyao](https://avatars.discourse-cdn.com/v4/letter/h/aeb1de/32.png) [@huyao](https://forum.inductiveautomation.com/u/huyao)\
**Post date:** [June 29, 2018, 7:09am UTC](https://forum.inductiveautomation.com/t/problem-with-opc-tag/18667/3 "2018-06-29T07:09:21Z")

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Hi zxcslo,  
Thanks, that works.