---
title: "Siemens Client | Introduction | N3uron KB V1.21"
slug: "siemens-client-introduction"
description: "Siemens Client is a N3uron module designed to provide connections to S7 Siemens PLCs. N3uron connects to these PLCs via TCP/IP using the S7 protocol…"
updated: 2025-10-22T19:08:34Z
published: 2025-10-22T19:08:34Z
canonical: "docs.n3uron.com/siemens-client-introduction"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.n3uron.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Introduction

The **Siemens Client module** supports basic connections to S7 **Siemens** PLCs. **N3uron** connects to these PLCs via TCP/IP using the S7 protocol. Currently, **N3uron** can connect to the following **Siemens** PLCs:

- S7 300
- S7 400
- S7 1200
- S7 1500

**Considerations for connecting to S7-1200 and S7-1500:**

The following considerations and configuration changes must be made when connecting to the **S7-1200** and **S7-1500** devices:

- The optimized block access must be turned off.  
![](https://cdn.document360.io/54093ab5-6b22-4542-a265-04377931f11a/Images/Documentation/SiemensClientOptimizedBlock.gif)
- The access level must be "full" and the "connection mechanism" must allow **PUT/GET**.  
![](https://cdn.document360.io/54093ab5-6b22-4542-a265-04377931f11a/Images/Documentation/SiemensClientPutget.gif)   
Note:

  - **Open TCP Port 10****2**: Required for **S7 communication** with PLCs.
  - **Enable ICMP**: If the driver operates on a Windows OS, ICMP traffic needs to be enabled.