Your CNC data —
Live. Straight from the controller.

Axis positions, R parameters, GUD variables, tool data — straight from your SINUMERIK 840D or SINUMERIK One into your .NET code. Without DDE, without an HMI dependency. From basic integration to Production Pro, across four tiers.

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4.8/5 on Trustpilot · 224 reviews

Free evaluation

Royalty-free

.NET (C#, VB.NET, C++/CLI)

39,000+ NuGet downloads

840D PowerLine, SolutionLine & One

Four Expansion tiers available

For developers

NC data in your code.
Live from the controller.

From IP address to axis position — in just a few lines. Channels, axes, tools, R parameters and GUD variables.

Program.cs — read axis position

// Connect to the 840D SolutionLine
using var client = new SinumerikClient("s840d.sl://192.168.0.80");
client.Connect();

// Read the current position of the first axis
var position = client.ReadValue(
    "/Channel/MachineAxis/measPos1");

Console.WriteLine(
    $"Axis 1: {position} mm");

Axis positions, feed rates, tools — live from the NC.

IP address, Connect, ReadValue — done. Access NC variables with the same syntax as in HMI Operate. No DDE, no Sinumerik Operate .NET needed, no extra license.

Access to channels, axes, feed rates, tools and mode groups

Address NC variables in the familiar HMI Operate syntax

R parameters, GUD variables and NSK/DEF symbols

Program.cs — R parameters and GUD variables

// Read R parameters and GUD variables
using var client = new SinumerikClient("s840d.sl://192.168.0.80");
client.Connect();

// Read an R parameter
var r10 = client.ReadValue("/Channel/Parameter/R[10]");

// Read a GUD variable
var myVar = client.ReadValue(
    "/Channel/UserData/myGudVar");

Console.WriteLine($"R10={r10}, GUD={myVar}");

R parameters, GUDs and symbols — through one and the same call.

Standard variables, user-defined GUDs and symbols from NSK/DEF files — all through the same ReadValue call. Addressing follows the familiar NC syntax you know from HMI Operate.

Address standard variables via NC paths

Read and write user-defined GUD variables

Resolve NSK/DEF symbols automatically

Program.cs — alarms and messages

// Receive alarms and messages
using var client = new SinumerikClient("s840d.sl://192.168.0.80");
client.Connect();

// Optional: load translations for your own languages
client.LoadMessages("mbdde_de.com");

// Subscribe to event messages
client.SubscribeEvents((sender, e) =>
    Console.WriteLine(
        $"Alarm: {e.Event.Message}"));

Alarms and messages — five languages built in, more on demand.

Receive NCU alarms and messages, with German, English, French, Italian and Spanish built in — add your own languages via a CSV or MBDDE COM file. Included in the Monitoring+ and Production Pro packages.

Event-based alarm processing

DE, EN, FR, IT, ES built in, your own via CSV or MBDDE COM file

Available from the Monitoring+ tier upward

Why this SDK

Six reasons that make the difference

Every one of these addresses a real problem that development teams hit when integrating CNC data.

Get started right away — no HMI, no DDE

Enter the IP address, open the connection, read data. No additional software on the controller, no DDE, no additional license required. The proof of concept is up in minutes.

No DDE · No HMI · No additional license

Royalty-free — one license, unlimited applications

Build as many applications as you like. No per-unit licenses, no runtime fees, no hidden costs per deployment.

∞ applications · 1 license

Industrial reliability — proven in three-shift operation

Stable in three-shift operation, automatic reconnect when the connection drops, PDU-optimized access for consistent data. In productive use at industrial customers.

.NET 6+ · Auto-reconnect

Four tiers — one SDK

From basic integration through file access and live streams all the way to full tool management. Start lean and expand as needed — without switching SDKs.

Basic · AM+ · MO+ · Production Pro

Support from the development team

Support requests for the LINK SDK are answered by the team that builds and maintains the SDK — short paths, technically sound answers, no ticket cascade through external call centers.

Support team · Developer contact

SINUMERIK PowerLine, SolutionLine and One

SolutionLine and One natively over TCP/IP, PowerLine via an MPI/PROFIBUS-to-Ethernet adapter (e.g. S7-LAN). Address NC variables in the familiar HMI Operate syntax — without DDE and without Sinumerik Operate .NET.

SL and One native · PL via Ethernet adapter

Customer voice

„We've had the SDK in use for a few years now. Everything has run smoothly so far and left nothing to be desired.
Best value for money!"

— Trustpilot review, Verified customer · 4.8 / 5 stars from 224 reviews

SDK variants

The right package for your project

Every tier includes a free evaluation, royalty-free licensing and top-level support from our developers.

Base package

TNX-S LINK .NET SDK

Read, write and inspect NC data — axis positions, feed rates, channels, tools, R parameters and GUD variables. The foundation for every CNC data integration.

Read & write NC variables

R parameters, GUDs, NSK/DEF symbols

Channels, axes, feed rates, mode groups

PDU-optimized access & auto-reconnect

.NET Standard 2.0+ / .NET 6+ / Docker

Try for free

Tiers built on the base package

Every tier includes all features of the tier below it — start lean and expand as needed.

Automation+

Base + NC file access. Upload and download NC programs, plus general access to the controller's remote file system.

Base package plus:

NC program upload/download

Controller remote file system

Buy now Request quotation

Recommended

Monitoring+

AM+ with live streaming. Receive high-frequency data changes directly from the controller via native traces and conditions.

Automation+ plus:

Live stream via traces & conditions

High-frequency data changes

Alarms & messages (localized)

Buy now Request quotation

Production Pro

MO+ with tool management. Full access to tool tables — read, write and remotely manage tool parameters.

Monitoring+ plus:

Remote tool management

Read & write tool tables

Manage tool parameters

Buy now Request quotation

Add-on for every tier

S7+ — access to the integrated PLC

On top of NC data, read and write the data blocks, flags and inputs/outputs of the S7 controller integrated in your 840D. Combines with any tier — NC and PLC data through the same SDK.

Connectivity

Communicates over TCP/IP via Ethernet — SolutionLine and One natively, PowerLine via an MPI/PROFIBUS-to-Ethernet adapter (e.g. S7-LAN). Address NC variables in the familiar HMI Operate syntax. Without DDE and without Sinumerik Operate .NET.

840D SolutionLine840D PowerLine (via Ethernet adapter, e.g. S7-LAN)SINUMERIK One

Technical data

What's inside the SDK

The SDK addresses NC data directly via path and token syntax — and, with the S7+ add-on, the data areas of the integrated PLC as well. Three controller families are supported, each with its
own connection string. Behind the name: TNX-S — Traeger Numeric Exchange, the S stands for Siemens.

NC data areas

Read / write

Axis positions, feed rates, channels, tools, mode groups

Variables

R parameters (zero-based from v1.1), GUDs, DPR values, NSK/DEF symbols

GUD modules

LUD, GUD, PUD, MGUD, SGUD

Addressing

Path /Channel/..., token 2 1 5 1 71,
alias from NSK

File system

NC programs & directories: list, create, delete, upload/download (from v1.3)

Events

Subscribe to alarms & messages — DE, EN, FR, IT, ES embedded, your own via CSV or MBDDE COM file

PLC data areas S7+ add-on

Operands

Inputs (E / I), outputs (A / Q), peripherals (PE/PA, PI/PQ), flags (M), data blocks (DB), timers (T), counters (Z / C)

Addressing

SIEMENS & IEC syntax — e. g. DB10.DBD20, M 10.1, EB 1

DB range

Data blocks 0–65535 · byte offset 0–65535 · bit offset 0–7

Device info

Location, module identifier, module series, DB sizes, system time

Structures (UDTs)

Structured PLC data types via your own .NET types, addressable statically & dynamically

Data types

Boolean & bits

1 to 8, 16, 32 and 64 bit
also as ARRAY OF

Integers

BYTE · WORD · DWORD · INT · DINT · LINT
also as ARRAY OF

Floating point

REAL · DOUBLE · LREAL
also as ARRAY OF

Date & time

TIME · S5-TIME · DATE · DATE_AND_TIME
also as ARRAY OF

Characters

CHAR through S7-STRING (max. 254 bytes) — also via BYTE with your own encoding

Performance

PDU-optimized multi-region access · KeepAlive · Watchdog · Auto-reconnect · connection pool

Controllers & connection strings

Each controller generation has its own connection string.
Connection is over TCP/IP; IPv6 is supported.

Eigenschaft	840D PowerLine S7-300/400 · MPI/PROFIBUS	840D SolutionLine S7-300/400 · Ethernet/PROFINET	SINUMERIK One S7-1500 · PROFINET
Connection string	`s840d.pl://<ip>?nck-mpi=<n>`	`s840d.sl://<ip>`	`one://<ip>`
Connection	Via MPI/PROFIBUS-to-Ethernet adapter (e.g. S7-LAN) · X101	X127 (PLC), onboard X130 (NCK) · PROFINET	X150 (PLC), onboard X1500 (NCK)
PLC rack/slot	Rack 0, slot 2 (default)	Rack 0, slot 2 (default)	Rack 0, slot 1 (default)
Notes	MPI address required (default MPI=3 / PROFIBUS=13)	Enable routing to the NCK if needed (corporate network)	Enable PUT/GET DBs non-optimized
Firewall	Open TCP port `102` bidirectionally — applies to all controller families