---
title: "Siemens Client | Appendix | N3uron KB V1.22"
slug: "siemens-client-appendix"
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: 2025-09-30T15:55:32Z
published: 2025-12-23T10:13:13Z
canonical: "docs.n3uron.com/siemens-client-appendix"
---

> ## 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.

# Appendix

## Reading Arrays and Strings from a Siemens PLC

### Reading arrays

The image below shows the data that will be read from a Siemens PLC.

![Figure 15- Data block](https://cdn.document360.io/54093ab5-6b22-4542-a265-04377931f11a/Images/Documentation/Figure%2015-%20Data%20block.png)

<meta charset="utf-8">Addresses in the Siemens Client module in N3uron will have the following format:

| **Siemens** | **N3uron** |
| --- | --- |
| **Name** | **Data Type** | **Offset** | **Address** | **Data Type** |
| int01 | Int | 0.0 | db102:00 | Int16 |
| arr01[0] | Int | 2.0 + 0.0 = 2.0 | db102:02 | Int16 |
| arr01[1] | Int | 2.0 + 2.0 = 4.0 | db102:04 | Int16 |
| arr01[2] | Int | 2.0 + 4.0 = 6.0 | db102:06 | Int16 |
| arr01[3] | Int | 2.0 + 6.0 = 8.0 | db102:08 | Int16 |
| arr01[4] | Int | 2.0 + 8.0 = 10.0 | db102:10 | Int16 |
| arr01[5] | Int | 2.0 + 10.0 = 12.0 | db102:12 | Int16 |
| arr01[6] | Int | 2.0 + 12.0 = 14.0 | db102:14 | Int16 |
| arr01[7] | Int | 2.0 + 14.0 = 16.0 | db102:16 | Int16 |
| arr01[8] | Int | 2.0 + 16.0 = 18.0 | db102:18 | Int16 |
| arr01[9] | Int | 2.0 + 18.0 = 20.0 | db102:20 | Int16 |
| float01 | Real | 22.0 | db102:22 | Float32 |
| arr02[0] | Sint | 26.0 + 0.0 = 26.00 | db102:26 | Int8 |
| arr02[1] | Sint | 26.0 + 1.0 = 27.00 | db102:27 | Int8 |
| arr02[2] | Sint | 26.0 + 2.0 = 28.00 | db102:28 | Int8 |
| arr02[3] | Sint | 26.0 + 3.0 = 29.00 | db102:29 | Int8 |
| arr02[4] | Sint | 26.0 + 4.0 = 30.00 | db102:30 | Int8 |
| arr02[5] | Sint | 26.0 + 5.0 = 31.00 | db102:31 | Int8 |
| arr02[6] | Sint | 26.0 + 6.0 = 32.00 | db102:32 | Int8 |
| arr02[7] | Sint | 26.0 + 7.0 = 33.00 | db102:33 | Int8 |
| arr02[8] | Sint | 26.0 + 8.0 = 34.00 | db102:34 | Int8 |
| arr02[9] | Sint | 26.0 + 9.0 = 35.00 | db102:35 | Int8 |
| float02 | Real | 36.0 | db102:36 | Float32 |

## 

The offset for each tag in N3uron is the result of the sum of the array offset and the offset of each element within the array.

![Figure 16- Final addresses](https://cdn.document360.io/54093ab5-6b22-4542-a265-04377931f11a/Images/Documentation/Figure%2016-%20Final%20addresses.png)

### 

## 

## Considerations for Using Ethernet/MPI Converters

Most extended MPI to Ethernet converters use a rack and a slot number for addressing processes. These elements are <meta charset="utf-8">directly converted into the MPI address. For example, in order to access the MPI address 2, you would need to use the value 0 as the rack number and 2 for the slot number on the <meta charset="utf-8">converter side. For precise assignment, please refer to the manufacturer's documentation for the converter. The table below provides the most common address assignments for these types of converters.

| **MPI** | **Rack** | **Slot** | **TSAP** |
| --- | --- | --- | --- |
| 0 | 0 | 0 | 0200 |
| 1 | 0 | 1 | 0201 |
| 2 | 0 | 2 | 0202 |
| ... |  |  |  |
| 31 | 0 | 31 | 021F |
| 32 | 1 | 0 | 0220 |
| 33 | 1 | 1 | 0221 |
| ... |  |  |  |
| 63 | 1 | 31 | 023F |
| 64 | 2 | 0 | 0240 |
| 65 | 2 | 1 | 0241 |
| ... |  |  |  |
| 95 | 2 | 31 | 025F |
| 96 | 3 | 0 | 0260 |
| 97 | 3 | 1 | 0261 |
| ... |  |  |  |
| 126 | 3 | 30 | 027E |