# Managing LInt type of Siemens S7-1500

**URL:** <https://forum.inductiveautomation.com/t/managing-lint-type-of-siemens-s7-1500/8258>\
**Category:** Archived Topics\
**Created:** [April 3, 2014, 1:51pm UTC](https://forum.inductiveautomation.com/t/managing-lint-type-of-siemens-s7-1500/8258 "2014-04-03T13:51:04Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Fabrizio.Sintex](https://avatars.discourse-cdn.com/v4/letter/f/43a26b/32.png) [@Fabrizio.Sintex](https://forum.inductiveautomation.com/u/Fabrizio.Sintex)\
**Post date:** [April 3, 2014, 1:51pm UTC](https://forum.inductiveautomation.com/t/managing-lint-type-of-siemens-s7-1500/8258/1 "2014-04-03T13:51:04Z")

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Hi, I am entering into the world of Ignition and I am enjoying it a lot.

Now I am testing communication with a plc ‘Siemens S7-1500’ using the ‘Ignition OPC-UA Server’ (Ignition Platform 7.6.3 - b2013090513).  
Question: “Which is the right ‘OPC Item Path’ I have to declare in order to have read and write access to a ‘Siemens S7-1500’ LInt (8 bytes integer) data type”?

PS.  
I have already tested with success the read and write of these ‘OPC Item Path’:  
[S7-1500]DB16,B0  
[S7-1500]DB16,I0  
[S7-1500]DB16,D0  
[S7-1500]DB16,D4

Thank you!

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**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\
**Post date:** [April 3, 2014, 3:53pm UTC](https://forum.inductiveautomation.com/t/managing-lint-type-of-siemens-s7-1500/8258/2 "2014-04-03T15:53:57Z")

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Dang, there’s no support for 8-byte datatypes in the driver right now. Unfortunately that means you’ll have to bring in two 4-byte integers side by side and then create an expression tag that ORs them together properly in the meantime.

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<div class="post-metadata">

**Author:** ![Fabrizio.Sintex](https://avatars.discourse-cdn.com/v4/letter/f/43a26b/32.png) [@Fabrizio.Sintex](https://forum.inductiveautomation.com/u/Fabrizio.Sintex)\
**Post date:** [April 4, 2014, 7:18am UTC](https://forum.inductiveautomation.com/t/managing-lint-type-of-siemens-s7-1500/8258/3 "2014-04-04T07:18:07Z")

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Hi Kevin,  
what a pity! Anyway no problem; I am going to follow your suggestion.  
Question: have you any info about a possible release date of 8-bytes integer supported by the driver?  
Thank you!  
Bye!