---
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)

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 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 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 |