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Machine monitoring and OT network access: a security review for manufacturers
By: Guidewheel
Updated:
March 21, 2026
8 min read
Machine monitoring and OT network security belong in the same deployment plan. Operations needs a useful record of equipment behavior, and IT needs to understand the devices, connections and access that create it. Begin with a defined production question, then review the complete proposed architecture before installation.
Current sensing can provide activity data without making PLC integration the starting point. That does not make the deployed system risk-free: the sensor installation, gateway, cloud service, accounts, updates and any integrations still need clear responsibilities and controls.
Separate three different monitoring questions
| Scope | Question it helps answer | Review needed |
|---|---|---|
| Production monitoring | When did the machine run or stop, and what loss should the team investigate? | State interpretation, production inputs and operator reasons |
| Condition monitoring | Has a measured condition changed in a way that warrants maintenance? | Signal suitability, diagnostic coverage and response ownership |
| OT network monitoring | What devices and traffic are present, and which events need security investigation? | Collection method, network visibility and incident workflow |
An electrical or controls downtime event does not by itself establish a network fault or cyber incident. Likewise, a passive network monitor observes available traffic; it does not automatically prevent an event from reaching production.
Map the actual data path
An air gap removes a network pathway. It is not a substitute for reviewing maintenance access, removable media, updates and operating procedures. A cellular route can provide an alternative to facility networking where coverage and power support it, but it still creates a device-to-cloud path to assess.
For the selected design, document which equipment is measured, where data is processed, what can communicate with what, who can access each component and how updates are delivered. Include remote support, integrations, retention, outage behavior and incident response.
Use the site's security requirements to evaluate authentication, access roles, encryption, segmentation, logging and update controls. Obtain the vendor's current documentation and agree any required changes before deployment.
Use operational data without turning it into a security diagnosis
Guidewheel's published analysis across 3,000+ machines reports the following downtime categories. These are observations in that equipment sample, not a forecast of what monitoring will recover at another plant.
| Category | Reported share of downtime | Reported average event duration |
|---|---|---|
| Other operational | 28% | 81 minutes |
| Mechanical breakdowns | 20% | 72 minutes |
| Electrical & controls | 18% | 107 minutes |
| Staffing issues | 13% | 197 minutes |
| Maintenance & cleaning | 11% | 85 minutes |
The category identifies where to investigate. The underlying reason, equipment findings and production context determine whether there is a practical intervention. Do not label all non-demand downtime controllable or all electrical events network-related.
The same published analysis reports a 60% weighted-average runtime and 26% median for plastics, and 44% versus 1% for pharmaceuticals. A median and a weighted mean summarize different aspects of a sample. Their difference does not identify the cause, output concentration, maintenance quality or recoverable capacity.
Runtime also differs from OEE, which requires the defined schedule, ideal rate and quality basis. Preserve those definitions and denominators when comparing equipment.
Agree the pilot before connecting equipment
- Define one operating question and the machines, signals and inputs needed to answer it.
- Complete electrical, IT and security review of the proposed configuration, including outage and recovery behavior.
- Agree installation access, responsibilities, any maintenance window and acceptance criteria.
- Validate machine-state interpretation and the operator reason workflow during representative production.
- Route alerts to an owner, test the response and record the result.
- Expand after the data, controls and operating workflow meet the agreed criteria. Recheck local requirements at each site.
Guidewheel brings machine data together with operating context. Our software and manufacturing experts help the team investigate a loss and test an action, while working alongside the systems and responsibilities already in place.
Build the business case from a measured loss
Value incremental good output with contribution margin, subject to demand and downstream capacity. Include hardware, installation, connectivity, software, integration, training and service in the cost. Keep security approval in the deployment plan rather than treating an operating benefit as a reason to bypass it.
Customer experience
We had our best month of the year, increasing production from 26k-35k/month to 46k cases in March. I attribute this to Guidewheel. Being able to see downtime data and address downtime reasons directly correlates to higher production.
Michael Palmer, VP of Operations, Direct Pack via Guidewheel's Customer Research
This customer account illustrates a team acting on downtime information. It does not establish a security outcome or an expected production gain for another deployment.
Frequently asked questions
Is current sensing an air-gapped or risk-free architecture?
A sensor connection alone does not define the architecture. Review the gateway, cloud service, accounts, updates, remote access and integrations. Ask which pathways are isolated and which controls apply to the actual configuration.
Does cellular connectivity remove the need for IT review?
No. It changes the connection route. Confirm coverage, power, the data path, access controls and the response to an outage with the responsible site teams.
Which KPIs connect monitoring with operations?
Use validated activity states, defined downtime reasons, good output and response time. OEE requires additional schedule, ideal-rate and quality inputs. Track security events separately so an operating category is not mistaken for a cyber diagnosis.
What should the vendor demonstrate before a rollout?
The signal and operating workflow on representative machines, the complete architecture and controls, responsibilities during interruption, and acceptance criteria for installation and expansion.
Discuss your monitoring requirements with Guidewheel.
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
