Guidewheel vs SCADA: Where Each Fits and Why Plants May Need Both

Guidewheel does not replace SCADA. The two answer different questions for different people. SCADA is a supervisory control and data acquisition layer: it reads PLCs and RTUs, drives HMI screens, raises process alarms, historizes tags, and can send commands back to the process. Guidewheel uses current sensing to establish run, idle and down context. AI-powered software and manufacturing experts help teams investigate losses and prioritize improvements. Validate a change before applying it at another plant. A plant running SCADA on its newest lines and nothing on the rest of the floor is a common and reasonable place to run both.

Guidewheel vs SCADA at a glance

• SCADA's job: supervise and control a process, with the authority to change it.
• Guidewheel's role: establish operating context, investigate production losses and support the team's improvement routine.
• The coverage question: which older, mixed and uncontrolled assets each proposed architecture can instrument, and at what effort.
• The capability Guidewheel does not have: control. No setpoints, no interlocks, no commands to the line.
• A combined approach: retain SCADA for process supervision and control, and evaluate Guidewheel where broader machine-state information and improvement workflows are useful.

What SCADA is genuinely good at

A supervisory control and data acquisition system can be the appropriate layer when the requirement is process supervision, visualization and approved control commands.

It carries control authority. An operator at an HMI can change a setpoint, acknowledge an alarm, start or stop a sequence, and the underlying control and safety architecture determines which commands are permitted. A SCADA display is not a substitute for required safety-rated controls. Nothing in a visibility layer should ever do this, and Guidewheel deliberately does not.

It sees inside the process. A SCADA tag database can carry temperatures, pressures, flow rates, torque, positions and recipe parameters at whatever resolution the control system publishes them. When the question is why a batch drifted out of specification, that depth is the answer. Current draw is not a substitute for it.

It historizes at engineering resolution. Process trending, alarm history and regulatory records are built on this. For plants under pharmaceutical or similar regulated requirements, the historian and the validated records around it are not optional.

It is also cheaper to license than most buyers expect. Ignition, the most-referenced platform in this category, sells per server on a perpetual licence, with tags, device connections and client views unlimited at no extra cost. A plant that grows from 5,000 to 50,000 tags does not get a bill for it. Its Edge variant trades away database connectivity and caps concurrent client views at two, but keeps unlimited tags and device connections with 35 days of internal storage.

So the question is not whether SCADA is good. It is what SCADA was scoped to cover, and what happens to everything outside that scope.

Where SCADA leaves a gap

The gap is not a defect in SCADA. It is a consequence of what SCADA costs to extend.

Coverage follows the connections that were implemented. Controllers, I/O, sensors and other sources can bring different assets into a SCADA application. Scope the required signals, engineering work and operating workflow rather than assuming every older asset needs a new controller.

Process tags are not operating metrics. A SCADA system knows a motor is energised. Turning that into availability, performance, an OEE number a plant manager trusts, a downtime reason an operator tagged, and a shift comparison across four plants is a separate build. It is entirely possible, and it is a project with a scope, a budget and an owner. Plants often discover they have years of tag history and still cannot say which line lost the most output last week.

Change has a cost per change. Adding an asset, restructuring a screen, adding a metric or standardising a definition across sites is engineering work, scheduled against everything else the controls team owns.

Audience and workflow depend on the application. A configured SCADA platform can serve plant-floor and enterprise users. The decision is whether the required operating views, definitions and response workflow already exist or need to be built.

✅

Guidewheel's 2026 Factory Uptime Report reports 54.5% uptime and a 31-point gap to the top quartile in its measured sample of 75 million machine-minutes. It attributes 48% of measured downtime to electrical, material and staffing categories. These are first-party reported sample findings, not a national census or proof that losses occur outside SCADA's coverage. Use the report's definitions when comparing it with your own baseline.

Compare the observed loss with the actual instrumented scope. The benchmark alone does not tell you whether a control system covered the affected equipment or which platform would resolve the loss.

What Guidewheel does instead

Guidewheel starts from a different premise: get truthful machine state on every machine first, then build the operating metrics on top of it.

A clip-on current transformer measures electrical activity around a suitable power conductor without a logical PLC connection. Validate how that signal maps to the machine states you need, and separately scope other sensors or system context. The full architecture also includes devices, connectivity, cloud access and any optional integrations.

An initial current-sensing path can avoid making PLC integration a prerequisite. Installation, signal validation, connectivity, security and any additional inputs still need a scoped plan. Guidewheel describes installation in as little as a day. In Guidewheel's Seacast case study, ten machines went live in two days and 30 were fully deployed in one month, spanning presses, x-rays, lathes and welders. That is a first-party case-study result rather than a schedule guarantee, but the spread of machine types is the point: the story includes different machine types. It does not establish that every asset will use identical setup or require no engineering.

The operating view is designed for the decisions your chosen workflow needs to support. Live run, idle and down states, downtime alerts, operator cause tagging, shift summaries, and a cross-site view an operations director can read without an HMI. Prices start at $25k annually. Final pricing depends on the number of machines and sites, contract length and hardware option. Get a quote for your operation.

The boundary is deliberate and worth stating twice. Guidewheel does not control machines and has no safety function. If your question is a setpoint change or an interlock, SCADA is the right system. For process readings such as temperature, pressure and flow, Guidewheel supports those sensors and 4–20 mA or pulse sources alongside the current signal.

Which leaves the practical question: given what each one covers, which do you actually need?

When to use each

Existing SCADA scope may cover a process while leaving other assets uninstrumented. Map the actual coverage before choosing whether to extend that application, add a complementary monitoring layer or combine approaches. Shared definitions and field ownership matter whichever path you choose.

A complementary visibility layer can serve a different operating workflow from the controls stack. Confirm its actual coverage and whether extending an existing system would meet the same need. The remaining question is organisational rather than technical: how to run both without the two teams fighting over whose number is right.

Running both without a turf war

Coexistence works when the boundary is written down before anything is installed. Four rules are usually enough.

1. SCADA keeps control. Guidewheel never gets it. No commands, no setpoints, no interlock participation. Put this in the pilot scope in writing, so the controls team can approve it on sight rather than inferring it from a demo.
2. Name the source of truth per field, once. Process variables and alarms come from SCADA. Machine state, downtime reason and the operating metrics come from Guidewheel. Order and job context comes from the ERP or MES. Write the list down and stop relitigating it.
3. Keep the paths separate. Guidewheel does not require PLC access or an OT network connection. Document the actual separate path with the site security owner. Devices, cloud access, remote administration and optional integrations still need the agreed review.
4. Let each system report to its own audience. Engineers keep the HMI. Supervisors and leadership get the FactoryOps view. Do not try to merge the two screens into one.

If you are working through this with a controls team that is sceptical, the pilot plan for running Guidewheel beside existing PLC and SCADA controls sets out the boundaries, the baseline measurements and the scale-or-stop criteria in the order a controls group will want to see them. If your SCADA platform is specifically Ignition, the Guidewheel and Ignition comparison goes further into where a configurable platform and a finished visibility layer genuinely differ.

Our team can work through your controls stack, asset list and operating questions with you. Talk to the Guidewheel team about a scoped evaluation.

Frequently asked questions

Does Guidewheel replace SCADA?

No. Do not use Guidewheel as the control or safety layer. Native controller fields and other process data require a supported, scoped input path. SCADA remains the system that supervises and controls the process. Guidewheel adds machine-state visibility and operating metrics across the whole fleet, including the assets SCADA does not reach.

Can Guidewheel run on machines that already have SCADA?

Yes. The clip-on sensor reads the machine's power conductor and does not connect to the control system, so it can be evaluated alongside an existing SCADA configuration. Validate the signal, installation and shared metric definitions on each representative machine; the presence of SCADA does not itself establish compatibility.

Does Guidewheel need to be on the OT network?

No. It does not require PLC access or a connection to the OT network, and the actual configuration should still be reviewed with the security owner. Keeping it off that network is the recommended arrangement and should be stated explicitly in the pilot scope.

Can SCADA already calculate OEE?

It can, with engineering work. The tags exist, but turning them into availability, performance, quality, a governed downtime taxonomy and a cross-site comparison is a separate project with its own scope and owner. Many plants have the tag history and still cannot answer which line lost the most output last week.

If we run both, which system owns downtime reasons?

Evaluate the workflow and context required. Downtime reason capture is an operator workflow rather than a control function, and the value comes from consistency across every machine, including the ones SCADA does not see. SCADA keeps process alarms, which are a different signal and should not be conflated with a production downtime reason.

About the author

Lauren Dunford is the CEO and Co-Founder of Guidewheel, a FactoryOps platform that empowers factories to reach a sustainable peak of performance. A graduate of Stanford, she is a JOURNEY Fellow and World Economic Forum Tech Pioneer. Watch her TED Talk, the future isn't just coded, it's built .