For years, manufacturing and engineering businesses treated office IT and shop-floor OT as two separate worlds. Today, those worlds are deeply connected, and that connection is where most modern cyber risk now sits.
CNC machines, PLCs, data loggers, IoT sensors and visualisation dashboards all talk to the same network as your CAD workstations, your ERP and your Microsoft 365 tenant. That gives operators and engineers real visibility, but it also gives attackers a much wider route in.
Why OT/IT convergence is now a board issue
For CEOs, MDs and FDs, the question is no longer "do we have antivirus?" It is "if a tier one customer audits us tomorrow, can we evidence that our production environment is secure?" Prime contractors, insurers and auditors are now actively asking:
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How OT and IT are segmented on your network
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Which legacy machines are still in service and how are they protected
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Whether shop-floor devices are monitored and patched
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How remote access by machine vendors is controlled and logged
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Whether incidents on the production network would be detected at all
A "yes, our IT provider handles it" answer is no longer enough.
Where the real risk is hiding
In our experience with UK manufacturers and engineering firms, the most common OT/IT security gaps include:
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Legacy operating systems running critical machinery, connected to the main network
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Default credentials still in use on industrial controllers
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Shared vendor remote access tools with no audit trail
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Flat networks where shop-floor devices sit alongside finance and HR data
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No monitoring of IoT devices, data loggers or warehouse dashboards
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Unclear ownership of OT, sometimes with engineering, sometimes with IT and often with no one
Each of these is fixable. None of them are fixed by accident.
A practical first step
A good starting point is a structured OT and IT review that maps every connected device, identifies legacy risk, segments OT from corporate IT and clarifies ownership. From there, monitoring, patching and supplier access can be brought under a single managed service.
EPX IT has been designing and securing manufacturing and engineering environments for many years. If you would like a plain-English conversation about where your OT/IT risk really sits, our team is ready to help.
