# Siemens MD tag configuration

**URL:** <https://forum.inductiveautomation.com/t/siemens-md-tag-configuration/16676>\
**Category:** Ignition\
**Created:** [January 22, 2018, 4:48pm UTC](https://forum.inductiveautomation.com/t/siemens-md-tag-configuration/16676 "2018-01-22T16:48:37Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Transistor](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/transistor/32/3380_2.png) [@Transistor](https://forum.inductiveautomation.com/u/Transistor)\
**Post date:** [January 22, 2018, 4:48pm UTC](https://forum.inductiveautomation.com/t/siemens-md-tag-configuration/16676/1 "2018-01-22T16:48:37Z")

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This configuration is working in Kepware’s Siemens OPC driver. How do I configure it in Ignition’s tag general properties? (I’ve tried various combinations without success.)

![](https://us1.discourse-cdn.com/inductiveautomation/original/2X/c/cb7d09331512306aadce33caa2e2eb631b7938f1.png)

The Ignition documentation is rather short of specific examples for all of these. (I’ve succeeded with M and Q booleans and a DBxx, DIxx.)

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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:** [January 22, 2018, 4:56pm UTC](https://forum.inductiveautomation.com/t/siemens-md-tag-configuration/16676/2 "2018-01-22T16:56:37Z")

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Like this:

 ![](https://us1.discourse-cdn.com/inductiveautomation/original/2X/c/c8077fd586601561ca5a92dcdeb0a4776f9ae065.PNG)

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<div class="post-metadata">

**Author:** ![Transistor](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/transistor/32/3380_2.png) [@Transistor](https://forum.inductiveautomation.com/u/Transistor)\
**Post date:** [January 22, 2018, 5:34pm UTC](https://forum.inductiveautomation.com/t/siemens-md-tag-configuration/16676/3 "2018-01-22T17:34:43Z")

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Thank you, zxcslo, for the quick reply.

I haven’t got your suggestion to work yet but I don’t understand why it should work. The Kepware data type is DWord (32 bit?) but yours is Integer (16 bit).

I do very little work with Siemens so I may be missing something basic here.

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<div class="post-metadata">

**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:** [January 22, 2018, 5:53pm UTC](https://forum.inductiveautomation.com/t/siemens-md-tag-configuration/16676/4 "2018-01-22T17:53:10Z")

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In Ignition, Integer IS 32bit.  
In Ignition Short is 16bit (like Siemens Integer).  
The difference between W(ord) and I(nteger) is that W is unsigned and I is signed.  
So, if you have value in Siemens for example -123, you will use Integer in Ignition (MI). If you don’t need/have negative values, you can use MW.