Do you modify our PLC code?

No. Read-only. Our software has no write path to the PLC by design.

Who installs Diagster for us?

Your IT person or a maintenance technician can handle it. Installation is simple — we provide a manual and remote support. Deploy it yourself or with our help.

Do we need our own OPC server?

Yes, or we'll help you pick one. OPC is not included in the subscription.

What if our engineers don't know AI?

Ask in your language, get an answer in your language. No configuration, no prompt engineering.

What happens after the trial?

Subscribe or stop. No auto-renewal traps, no hidden fees.

How much does deployment cost?

30-day trial is free. After that, a per-controller subscription — custom quote. Deployment support is included; AI tokens are billed separately.

How much do AI tokens per query cost?

Tokens are billed separately by usage. The cost depends on the complexity of the code and the problem, and on the current pricing and AI model — we continuously optimise it.

Diagster

Machine diagnostics in 5 minutes instead of 2 hours

An AI agent connects read-only to your PLC, reads the controller code and finds the root cause of downtime — in plain language.

Start a 30-day free trial →

Read-only — we never modify your PLC
Any PLC over OPC — vendor-independent
No PLC programmer on call 24/7

Try it yourself →

Does this scenario sound familiar?

Three pain points we hear from production managers every week.

Line is down, the PLC programmer isn't around

The maintenance technician stares at the controller and doesn't know what's next. The PLC programmer is on vacation or in another plant. You don't have to keep one on call 24/7 — and every hour of downtime costs thousands.

Diagnostics takes 2-4 hours

Standard root cause hunt: trends, variable inspection, calling the integrator. The clock keeps ticking.

Knowledge leaves with people

The same problem comes back. No one remembers how it was solved last time. When a senior leaves — the knowledge leaves too.

How it works

Three steps. No PLC modifications, no cloud integrations.

Connect the software to your OPC server

15 minutes, on your premises. No PLC changes, no internet exposure of your controller. Your IT person or a maintenance technician can handle it — we provide a manual and remote support; deploy it yourself or with our help.

Describe the symptom

You describe what's happening — or what's missing — like talking to a technician. Diagster selects the variables to analyze.

Get a root cause answer

The agent has analyzed the controller code and points at the specific cause + a suggestion for what to check next.

What you get

Product features — short and to the point.

Root cause diagnosis

The core feature — the agent identifies the cause of the downtime, not just the symptom.

PLC program analysis (read-only)

The agent reads block structure, FBs, FCs, DBs and understands the process logic.

Any PLC, vendor-independent

Anything that speaks OPC: Siemens, Allen-Bradley, Beckhoff, Mitsubishi, Schneider, Codesys-compatible.

coming soon

Diagnosis with video analysis

On the roadmap after the first deployments.

There are no alternatives. But if there were…

→ Vendor-independent — any PLC over OPC, we don't lock you to a single controller brand
→ Polish through and through — engineers, support and contracts in Polish
→ High-quality answers — a concrete cause and what to do next, ALL grounded in your controller's code, not generic fluff
→ Many years of automation experience in the team — not just code, we run service jobs ourselves and take part in projects
→ Read-only, guaranteed — no writes to the PLC in any scenario (also configurable from the OPC Server)
→ 30-day trial on your own OPC — test it under real conditions

Security and confidentiality

The most common question from IT: 'What happens to our data?'. Short answer: it stays with you.

Read-only

We read from the PLC. We never modify. There is no write path in our software, even theoretically.

Software runs locally

The application runs on your own server (Windows / Linux). Your PLC is not exposed to the internet.

Your code does not train models

We use enterprise-class infrastructure. Your PLC program remains your property.

No background connections

The agent connects only when you ask a question. No telemetry, no constant stream.

Pricing

You pay per controller you diagnose. 30-day free trial, deployment support included.

30 days free

Trial

0PLN

Full access · 30 days

Validate the product on your shop floor — zero risk

Full functionality for 30 days
Deployment support
Support during the trial
No credit card required

Start free

Per controller

Custom quote

1 controller · multi-controller packs

Pay for as many controllers as you diagnose

Monthly or annual billing
Deployment support included
Any PLC, vendor-independent
Cancel anytime

Request a quote

Enterprise

Custom

Many controllers / multi-site

Large plants, multi-site, integrations

Any number of controllers
Dedicated deployment
SLA support
MES / CMMS integration
Bring your own API keys

OPC server is not included — we help you pick one (Kepware / Matrikon). Monthly or annual billing. Larger deployments, multi-site and MES integration — Enterprise plan, contact us.

Frequently asked questions

No. Read-only. Our software has no write path to the PLC by design.
For diagnosis we send to the AI model's API only what's needed — your query and the relevant fragments of code and variables. Without this, diagnosis won't work. We do not use your code to train models. We never write to the PLC — we are read-only.
Anything that supports OPC: Siemens, Allen-Bradley, Beckhoff, Mitsubishi, Schneider, Codesys-compatible.
Your IT person or a maintenance technician can handle it. Installation is simple — we provide a manual and remote support. Deploy it yourself or with our help.
Yes, or we'll help you pick one. OPC is not included in the subscription.
Ask in your language, get an answer in your language. No configuration, no prompt engineering.
Subscribe or stop. No auto-renewal traps, no hidden fees.
30-day trial is free. After that, a per-controller subscription — custom quote. Deployment support is included; AI tokens are billed separately.
Tokens are billed separately by usage. The cost depends on the complexity of the code and the problem, and on the current pricing and AI model — we continuously optimise it.

Try it free for 30 days

Zero risk. Read-only. Support included. Quick 20-minute intro call.

Leave your details — we'll be in touch soon.