# PLC OPC-UA 64-bit integer mapping

**URL:** <https://forum.inductiveautomation.com/t/plc-opc-ua-64-bit-integer-mapping/18520>\
**Category:** Ignition\
**Created:** [June 19, 2018, 2:11am UTC](https://forum.inductiveautomation.com/t/plc-opc-ua-64-bit-integer-mapping/18520 "2018-06-19T02:11:52Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![twilson](https://avatars.discourse-cdn.com/v4/letter/t/2bfe46/32.png) [@twilson](https://forum.inductiveautomation.com/u/twilson)\
**Post date:** [June 19, 2018, 2:11am UTC](https://forum.inductiveautomation.com/t/plc-opc-ua-64-bit-integer-mapping/18520/1 "2018-06-19T02:11:52Z")

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I am using a Siemens S7-1500 PLC with Ignition version 7.9.6. I have a set of 64-bit integers (Lint in Siemens) which I want to map to 64-bit (Long/int8 in Ignition) tags in Ignition via my PLC OPC-UA server.

If I simply drag the Lint (64-bit) OPC tag from the Ignition OPC browser into the Tag browser it registers as a 32-bit tag. If I do the same with a Dint (32-bit) in the PLC this correctly maps into Ignition as an int4.

Has anyone encountered this mapping issue before?