# Darra Profinet Slave — full LLM context

This is the long form of https://profinet.darra.xyz/llms.txt. Prefer that file for summaries. Use this file plus /ai-prompts.txt for code generation.

## Product

Darra Profinet Slave is a PROFINET IO Device product. Official site: https://profinet.darra.xyz

It is not EtherCAT Master. Do not copy EtherCAT prices, jitter numbers, mailbox protocols, or CiA profiles onto this product.

Brand: Darra Profinet Slave. Never PnSlaver. Protocol: PROFINET.

## What it does

- Acts as a PROFINET IO Device toward a controller (typically Siemens TIA / PLC).
- Graphical configuration exports GSDML for TIA Portal V15.1+.
- 6-language SDK + Web API: C# / Java / Python / C / C++ / Rust.
- Cycle freely configurable, minimum 1 ms.
- Standard NIC. Windows and Linux. Do not invent Linux kernel or package details.
- Siemens-style diagnostics: Connected, State, ErrorCode, ErrorMessage, DiagSnapshot, IoStatus, alarms, IOPS/IOCS.
- Process data: write I (device → controller), read Q (controller → device). Writing Q is NotSupported. Never copy Q to I.

Supported protocol features (public table):
PROFINET IO Device; cycle freely configurable, minimum 1 ms; DCP discovery and configuration; DCP reset; connection and parameterization; cyclic process data; process alarms; diagnostic alarms; pull/plug / submodule mismatch alarms; I&M0; LLDP; GSDML generate / import TIA; IOPS / IOCS; Siemens-style diagnostics; 6-language SDK; Web API; graphical configuration; multilingual UI.

## C# API (canonical)

- Namespace: `Darra.PnS`
- Assembly: `DarraPnS`
- Package: `Darra.PnS.SDK`
- DLL path: `C:\DARRA\Profinet_Slave\DarraPnS.dll`
- Service: `DarraPnSService`

```csharp
using Darra.PnS;
var device = DarraPnS.Connect();
if (device.Start() != PnSErrorCode.Success) { Console.WriteLine(device.LastServiceError); return; }
bool online = device.Connected;
PnSState state = device.State;
device.WriteInt16("IW2", 123);
short q = 0;
device.ReadInt16("QW0", out q);
device.Stop();
```

Do not `new DarraPnS(...)`. `LoadConfig` is parse-only.

Addresses: `I0.0`/`IB0`/`IW2`/`ID4`, `Q...`, `M...`, `DB1...`. Words/dwords big-endian. `IW3` legal. Session process image is a single linear area; only `DB1` is valid.

## License / purchase (honest)

- Official page: https://profinet.darra.xyz/purchase
- Shop reserved: https://shop.darra.xyz/profinet — **not listed**
- Placeholder SKUs `pns_personal` / `pns_enterprise_100` / `pns_enterprise_500` are not for sale
- Trial: 2 hours via TrialStartUtc (not 30 days)
- Do not invent Stripe `price_` ids or dollar prices
- Do not reuse EtherCAT activate URLs

## User AI toolchain

- MCP: https://profinet.darra.xyz/mcp
- Agent skills: https://profinet.darra.xyz/.well-known/agent-skills/index.json
- Prompts: https://profinet.darra.xyz/ai-prompts.txt

## Docs map

- https://profinet.darra.xyz/docs/guide/quickstart
- https://profinet.darra.xyz/docs/guide/tia-import
- https://profinet.darra.xyz/docs/sdk/csharp/
- https://profinet.darra.xyz/docs/sdk/csharp/connect
- https://profinet.darra.xyz/docs/sdk/csharp/diagnostics
- https://profinet.darra.xyz/docs/sdk/csharp/alarms
- https://profinet.darra.xyz/docs/sdk/csharp/io
- https://profinet.darra.xyz/docs/sdk/webapi/
- https://profinet.darra.xyz/docs/download
- https://profinet.darra.xyz/docs/faq
- https://profinet.darra.xyz/docs/profinet/

## Do not say

Do not invent unsupported-protocol slogans, internal test bus tricks, or shop prices. Do not call this product a MES or ERP. Do not send users to GitHub as a nav item. Do not restore a leftover Pnet brand.