Do you modify our PLC code?

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

What format do you need our PLC program in?

Ideally the source (text) form of the controller program. We handle Siemens and Allen-Bradley without issue. If you're not sure how to export it — send us what you have and we'll help prepare the right file.

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.

Does it work offline?

OPC and local data analysis — yes. The diagnosis itself requires an internet connection to the AI model API.

How much does deployment cost?

30-day trial is free. After that, from 500 PLN/month per controller (5-controller pack — 2,000 PLN/month). Deployment support is included; AI tokens are billed separately.

How much do AI tokens per query cost?

Roughly ~1 USD per query, but the cost depends on the complexity of the code and the problem, and on the current pricing and AI model. Tokens are billed separately by usage, and we continuously optimise the cost per query.

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 →Watch the demo (3 min) WIP

✓ Read-only — we never modify your PLC
✓ Software runs locally on your premises — data stays on the floor
✓ 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.

Ask in plain language

'What stopped the line at 14:23?', 'Why isn't M14 feeding?'. Talk to it like you'd talk to a technician.

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.

✓✓

Conversational queries

Ask in your language, get an answer in your language. No SQL, no setup — easier than texting.

✓✓

PLC program analysis (read-only)

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

✓✓

Auto-documentation

We generate a plain-language description of the PLC logic — useful for onboarding and audits.

✓✓

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.

How we differ from the alternatives

→ Vendor-independent — any PLC over OPC, we don't lock you to a single controller brand
→ Polish-first service — engineers, support, invoicing and contracts in Polish
→ High-quality answers — a concrete cause and what to do next, grounded in your controller's code, not generic fluff
→ Many years of automation experience in the team — we know the shop floor, not just the code
→ Read-only, guaranteed — no write path to the PLC, in any scenario
→ 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.

✓

Process data stays on-site

Only your question and the relevant code fragments go to the AI model API. Process values do not.

✓

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

from 500PLN/month

1 controller · 5-controller pack = 2,000 PLN/month

Pay for as many controllers as you diagnose

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

Choose

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.
The software runs locally on your premises. Process data does not leave the floor. Your code is not used to train AI models.
Anything that supports OPC: Siemens, Allen-Bradley, Beckhoff, Mitsubishi, Schneider, Codesys-compatible.
Ideally the source (text) form of the controller program. We handle Siemens and Allen-Bradley without issue. If you're not sure how to export it — send us what you have and we'll help prepare the right file.
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.
OPC and local data analysis — yes. The diagnosis itself requires an internet connection to the AI model API.
30-day trial is free. After that, from 500 PLN/month per controller (5-controller pack — 2,000 PLN/month). Deployment support is included; AI tokens are billed separately.
Roughly ~1 USD per query, but the cost depends on the complexity of the code and the problem, and on the current pricing and AI model. Tokens are billed separately by usage, and we continuously optimise the cost per query.

Try it free for 30 days

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

📞 We'll get back to you within 1 business day.