# Ignition 7.6.4 build Siemens PLC Communiation Problem **URL:** \ **Category:** Ignition\ **Created:** [December 30, 2013, 9:10am UTC](https://forum.inductiveautomation.com/t/ignition-7-6-4-build-siemens-plc-communiation-problem/7764 "2013-12-30T09:10:20Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![ashish007pict](https://avatars.discourse-cdn.com/v4/letter/a/aca169/32.png) [@ashish007pict](https://forum.inductiveautomation.com/u/ashish007pict)\ **Post date:** [December 30, 2013, 9:10am UTC](https://forum.inductiveautomation.com/t/ignition-7-6-4-build-siemens-plc-communiation-problem/7764/1 "2013-12-30T09:10:20Z")
Hello All, I was earlier using 7.3.7 version on Fedora 14 linus to communicate with AB/Mitsu/Siemens PLCs. I recently upgraded to latest version to avoid bugs in earlier versions. So currently I am using 7.6.4 version. But I observed that my Siemens PLC is shown connected under STATUS tab but when I open Designer and check under SQL Tags Browser, my tags shows ? symbol before tag names which means it is not reading PLC tags actually. I am using Siemens S7-315-2PN/DP PLC with firmware3.1/3.2 I have not yet tested with AB PLC. But I will check in a day or two and update the same. Can somebody help me with this? Thanks Ashish ---
**Author:** ![greg.simpson](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/greg.simpson/32/3135_2.png) [@greg.simpson](https://forum.inductiveautomation.com/u/greg.simpson)\ **Post date:** [December 30, 2013, 4:14pm UTC](https://forum.inductiveautomation.com/t/ignition-7-6-4-build-siemens-plc-communiation-problem/7764/2 "2013-12-30T16:14:18Z")
What errors, if any, are you receiving in the Ignition Gateway Console? ---
**Author:** ![ashish007pict](https://avatars.discourse-cdn.com/v4/letter/a/aca169/32.png) [@ashish007pict](https://forum.inductiveautomation.com/u/ashish007pict)\ **Post date:** [December 31, 2013, 8:19am UTC](https://forum.inductiveautomation.com/t/ignition-7-6-4-build-siemens-plc-communiation-problem/7764/3 "2013-12-31T08:19:52Z")
Hello Greg, I do not get any errors on system console regarding communication of siemens plc. I have attached system console log file. I have also attached some of screen shots for your reference of my project. The same project works without any errors on 7.3.7. I guess I have not made any mistake in defining the tags. e.g. [Siemens]DB510,REAL0… Plese correct me if I am wrong here. Thanks, Ashish ---
**Author:** ![greg.simpson](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/greg.simpson/32/3135_2.png) [@greg.simpson](https://forum.inductiveautomation.com/u/greg.simpson)\ **Post date:** [December 31, 2013, 4:28pm UTC](https://forum.inductiveautomation.com/t/ignition-7-6-4-build-siemens-plc-communiation-problem/7764/4 "2013-12-31T16:28:30Z")
Are you able to call Tech Support? ``` 1-800-266-7798 ``` ---
**Author:** ![ashish007pict](https://avatars.discourse-cdn.com/v4/letter/a/aca169/32.png) [@ashish007pict](https://forum.inductiveautomation.com/u/ashish007pict)\ **Post date:** [January 2, 2014, 4:15am UTC](https://forum.inductiveautomation.com/t/ignition-7-6-4-build-siemens-plc-communiation-problem/7764/5 "2014-01-02T04:15:44Z")
Hello Greg, I cant call you as I am at remote location. Is there any other way to give support? Thanks, Ashish ---
**Author:** ![greg.simpson](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/greg.simpson/32/3135_2.png) [@greg.simpson](https://forum.inductiveautomation.com/u/greg.simpson)\ **Post date:** [January 2, 2014, 2:57pm UTC](https://forum.inductiveautomation.com/t/ignition-7-6-4-build-siemens-plc-communiation-problem/7764/6 "2014-01-02T14:57:06Z")
What scan class are these tags using? Can you attach a screenshot of the diagnostics page for the device. This can be found in the Ignition gateway under Configure\>OPC-UA\>Devices. To the right of the device you will find a diagnostics link. ---
**Author:** ![ashish007pict](https://avatars.discourse-cdn.com/v4/letter/a/aca169/32.png) [@ashish007pict](https://forum.inductiveautomation.com/u/ashish007pict)\ **Post date:** [January 3, 2014, 5:21am UTC](https://forum.inductiveautomation.com/t/ignition-7-6-4-build-siemens-plc-communiation-problem/7764/7 "2014-01-03T05:21:28Z")
Hello Greg, Thanks for feedback, I am using default scan class in Tag Definition. I have attached screen shots for Diagnostics page under Configure\>OPC-UA\>Devices. I have also attached screen shot for Tag Definition which display the Tag address, scan class etc. Thanks, Ashish ---
**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 6, 2014, 7:57am UTC](https://forum.inductiveautomation.com/t/ignition-7-6-4-build-siemens-plc-communiation-problem/7764/8 "2014-01-06T07:57:40Z")
Is this of any help? [http://www.inductiveautomation.com/forum/viewtopic.php?f=55&t=11404](http://www.inductiveautomation.com/forum/viewtopic.php?f=55&t=11404)