# Subject: Assistance Required for Siemens PLC Connection to Ignition Server

**URL:** <https://forum.inductiveautomation.com/t/subject-assistance-required-for-siemens-plc-connection-to-ignition-server/100845>\
**Category:** Ignition\
**Tags:** ignition80, ignition81\
**Created:** [January 14, 2025, 5:44am UTC](https://forum.inductiveautomation.com/t/subject-assistance-required-for-siemens-plc-connection-to-ignition-server/100845 "2025-01-14T05:44:33Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![rufus\_reyneke](https://avatars.discourse-cdn.com/v4/letter/r/ecae2f/32.png) [@rufus\_reyneke](https://forum.inductiveautomation.com/u/rufus_reyneke)\
**Post date:** [January 14, 2025, 5:44am UTC](https://forum.inductiveautomation.com/t/subject-assistance-required-for-siemens-plc-connection-to-ignition-server/100845/1 "2025-01-14T05:44:33Z")

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Good Morning,

I’m experiencing an issue with connecting one of our Siemens PLCs to the Ignition server. Specifically, the Siemens CPU [315-2AG10-0AB0] connected to a CP 343-1 [6GK7343-1EX30-0XE0] is not establishing a connection when set up.

We are able to connect to the PLC over our industrial network and monitor/modify all program variables. However, we are unable to connect the PLC to Ignition for trending on Axiom/Historian.

Any assistance you can provide would be greatly appreciated.

Thank you!

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<div class="post-metadata">

**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [January 14, 2025, 1:02pm UTC](https://forum.inductiveautomation.com/t/subject-assistance-required-for-siemens-plc-connection-to-ignition-server/100845/2 "2025-01-14T13:02:27Z")

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Strictly speaking, the connection is the other way. Ignition will connect **to** the PLC. This would be the legacy driver, documented here:

> **[Siemens | Ignition User Manual](https://www.docs.inductiveautomation.com/docs/8.1/ignition-modules/opc-ua/opc-ua-drivers/siemens#connecting-to-a-siemens-device)**
>
> The Siemens drivers in Ignition support basic connections to S7 devices. Ignition connects to these PLCs via TCP/IP using the S7 protocol. Similar to Modbus and some Allen Bradley connections, the Siemens S7 devices do not support tag browsing. You...

Have you tried following those instructions?