A model of every machine, built while it runs.

We are building LK On to stand on the machine and watch everything it can see: the PLC program, the controller and its drives, sensors the PLC never had. It will learn how the machine normally works and tell the mechanic in plain words what stopped and where to look. LK Up, a free maintenance system that works today, keeps every repair on the same machine. Allen-Bradley, Siemens S7, Modbus. No cloud required.

Panel dead right now? LK Go, a free iPhone and iPad app, runs the machine from the phone today. Start with the 10-minute triage guide.

The modelOne per machine

Everything the machine shows, in one model.

A machine's knowledge is scattered: the program on a laptop, drive settings nobody wrote down, a sensor nobody reads, a repair in one mechanic's head. LineKeeper is building one model per machine, fed from three sides, that grows every day the machine runs. The more the device can observe, the better it will understand the machine.

On the machine

Its own devices

The PLC program and its live values, read today. In progress: the controller and its modules, PowerFlex drives, and sensors the PLC never had: temperature, vibration and motor current on LK On's own inputs.

LK On · the supervisor · in progress

Will watch and learn

It will learn the cycle with no setup: what follows what, and how fast; record every stop with the minute before it; notice a part that answers slower than it used to, and score each mechanism from 0 to 100.

LK Up · maintenance

Keeps the service

Work orders, preventive maintenance, parts, requests by QR code, downtime and reliability reports, free on your own PC, today. Coming with LK On: stops arrive as downtime by themselves, and run hours fire the next PM.

A preview of the model screen, in progress: parts, program, behaviour, findings, repairs · a made-up filling line, numbers illustrative · tap to enlarge

In progress, release soon: the model, findings, health scores and the link to LK Up. What LK On does today: the operator panel, the live ladder, dashboards, history and alarms.

How the five layers will work, mechanism by mechanism, is on the LK On page.

What it is forFor the people who fix it

Less downtime. Fewer surprises. Every repair on record.

The goal: plain words for the mechanic, the operator and the manager about what the machine is doing, what stopped and what to check first. For the engineer, every detail one tap deeper: the live ladder, why a signal is off, the history of every value.

When it stops

Shorter downtime

LK On will say what stopped, why, and where to look first, named by place with the photo of the part, so a mechanic who has never seen the machine knows where to go.

Before it breaks

A warning, not a surprise

A slower response, a stuck feedback, a missing signal: LK On will notice them over weeks and raise a request before they stop the line.

Every day

Records without typing

LK Up gives a manager the reports today: downtime by reason, MTBF, MTTR, preventive maintenance on time. With LK On, stops and run hours will land on the right machine by themselves.

In development: an optional online server with AI and advanced analytics across machines and plants. Everything on your own network keeps working without it, and LK Up stays free.

LK On and LK Go are not certified HMIs and not safety devices. Diagnostics only read; over the internet everything is view only. See it first: the live demo runs a simulated line in your browser.

Who it's forSame system, three jobs

In the plant, in the van, or shipped with the machine.

The plant

Put LK Up on a PC in the office today, free: work orders, preventive maintenance and downtime reports. On the machines whose stops cost the most, LK On is the operator panel and live ladder today; the supervisor that tells mechanics what stopped and where to look is in progress, with a release soon.

Maintenance · LK On + LK Up →

The integrator

You sold the customer three machines. One LK On holds a profile for each, built from your own project files; the day something stops, you read the live ladder and the history without a site visit. Learning how each machine runs is in progress.

Ship it with the machine →

The service engineer

One kit in the van covers twenty machines at a dozen customers. On site: plug in, read the ladder live, see why a signal is off, without licensed engineering software on the laptop.

Service & commissioning · LK On →
Free toolsNo app, no account

Free tools and guides for a bad day at the machine

FAQFair questions
What does LineKeeper make?

One system for the machine and its maintenance. LK Up is a free maintenance system (CMMS) on a PC in your plant: work orders, preventive maintenance, parts, requests and reports, with technicians on their phones; it works today. LK On is a 7″ or 10″ industrial touchscreen on the machine network: today the operator panel, the live ladder, dashboards, history and alarms; in progress, with a release soon, the supervisor that learns how the machine normally works, says in plain words what stopped and where to look, and builds a model of each machine while it runs. LK Go, a free iPhone and iPad app, runs a machine from the phone the day its panel dies.

Which one do I need?

Start with LK Up: it is free, and work orders and repair history pay off on the first day. Add LK On on the machines whose stops cost the most. A panel is dead today: LK Go, free. Prices are on the pricing page.

What will the model know about a machine?

Five layers for every mechanism: the parts and the photo they are marked on, the rung of the program that commands them, how they behave (what follows what and how fast), what the device noticed (a slower response, a stop), and what people did (the repair, whether it held, the spare on the shelf). The more the device can observe, the fuller the model. It is in progress, with a release soon; a preview is on the LK On page.

Do LK On and LK Up need each other?

No, each works alone. The link between them is in progress, with a release soon: a stop on LK On will become downtime in LK Up on the right asset with the alarm as the cause, run hours will arrive as meters for preventive maintenance, and the Call maintenance button on the machine will raise a request the mechanic sees on the phone.

Which PLCs do they work with?

LK On reads Allen-Bradley ControlLogix and CompactLogix over EtherNet/IP, legacy PCCC (SLC-500, MicroLogix; PLC-5 experimental), PowerFlex drives (read-only), Siemens S7, Modbus TCP and RTU, and OPC UA. S7-1200/1500 need PUT/GET enabled and non-optimized DBs: a CPU access setting, not a program change. LK Go covers ControlLogix, CompactLogix, S7 and Modbus TCP. LK Up does not talk to PLCs.

Does anything need the cloud?

No. LK On runs everything on the device, LK Up runs on your own PC with phones that work offline and sync later, and LK Go talks from the phone straight to the controller. Internet is only needed for optional alarm messages, remote viewing and software updates. An optional online server with AI and advanced analytics is in development; nothing on your network will depend on it.

Our line is down right now. Can you help faster?

Two things, both free: install LK Go (it puts live values on a phone in about 15 minutes, and start/stop buttons once the right tags are identified) and tell us in the form below that the line is down. The remote triage call is free. Start with the 10-minute triage guide.

We're a system integrator. Where do we fit?

LK On holds a profile per machine, builds each one from your own project files and gives you revocable remote viewing with an audit log, so the day a machine stops you see why without a site visit. How it works is on the integrator page. Need a driver, report or export your customers ask for? Tell us: integrator requests reach the developer directly.

QuestionsA real engineer answers

Ask an engineer. Free.

Stuck on a dead panel, a stubborn PLC, or wondering which tool fits your setup? Write to us. A real engineer answers, line-down messages first.