A surprising amount of manufacturing downtime starts long before production actually stops. Siemens' 2024 True Cost of Downtime research estimated that the world's 500 largest companies lose approximately $1.4 trillion annually to unplanned downtime — roughly 11% of annual revenue. Controllers age out. SCADA platforms lose vendor support. Industrial networks slowly degrade. Power quality issues quietly damage sensitive electronics over time.
It's tempting to live by "if it ain't broke, don't fix it." Until you find yourself saying, “Uh oh!”
In legacy industrial environments, system integrators and automation lifecycle specialists consistently identify foundational infrastructure problems as a leading driver of extended downtime — particularly when obsolete PLCs, unsupported SCADA platforms, and aging industrial networks converge in the same facility. These failures are especially common where automation platforms have been running for 15 to 25 years and hardware has already reached end-of-support status.
What causes infrastructure-related downtime in manufacturing plants?
Common causes include obsolete PLCs, unsupported SCADA systems, degraded industrial networks, and power quality problems affecting sensitive automation equipment.
PLCs are the backbone of industrial automation. Many plants still rely on controllers like Allen-Bradley PLC-5 or Siemens S5 systems that have far outlived their intended lifecycle yet continue running in production anyway.
The risk appears when hardware fails and replacement parts no longer exist. Industry migration specialists regularly cite these systems as examples where spare parts increasingly come from refurbished or secondary-market inventory rather than OEM supply channels.
Plants then face difficult choices:
How long do industrial PLCs typically last?
Many PLCs remain operational for 15–25 years or longer, but hardware availability and vendor support often end long before the equipment stops functioning.
There's no squeaky wheel to grease before PLC failure. The most effective strategy is proactive modernization planning — identifying critical controllers approaching end of life and developing phased upgrade roadmaps before production stops.
Many industrial facilities still operate SCADA systems on unsupported operating systems such as Windows XP or legacy Windows Server platforms. As someone with a software background, I find this striking: the same OS lifecycle risk I'd never accept on a personal machine is quietly running critical industrial operations in facilities around the world.
These systems may still function day-to-day, but the risks are real:
Why are unsupported SCADA systems risky?
Unsupported SCADA systems no longer receive security patches or vendor support, increasing cybersecurity exposure and limiting compatibility with modern industrial platforms.
Unsupported SCADA environments also put a ceiling on digital transformation efforts. Modern reporting, analytics, and remote visibility tools often can't communicate effectively with aging platforms, limiting what's even possible without a full rebuild.
Modern SCADA systems allow plants to maintain connectivity to legacy equipment while moving onto supported operating systems and maintainable architectures.
Industrial networks operate in harsh environments. Heat, vibration, dust, moisture, and electromagnetic interference are well-documented contributors to the gradual degradation of industrial Ethernet infrastructure over time.
What begins as occasional packet loss can quietly evolve into:
Many legacy OT environments also rely on unmanaged switches or commercial-grade networking equipment never designed for industrial conditions, limiting visibility into network traffic, diagnostics, and fault isolation.
Reliable industrial networks require industrial-grade managed switches, proper segmentation, network monitoring, correct cable routing and shielding, and visibility into device health and traffic patterns. Without those controls, plants often spend months chasing intermittent problems without ever identifying the root cause.
Control systems contain sensitive electronics that are highly vulnerable to poor power quality.
Voltage sags, surges, harmonics, and transient events can cause premature equipment failure, random controller resets, corrupted data, shortened hardware lifespan, and intermittent operational instability — often without any obvious explanation.
These failures are frequently misdiagnosed because the underlying electrical event may last only milliseconds. Even a brief voltage sag can trigger controller resets, communication interruptions, or data corruption in sensitive industrial electronics. And because many facilities don't actively monitor power quality, recurring voltage disturbances can continue damaging equipment over time without anyone connecting the dots.
Protective measures typically include UPS systems, surge protection devices, power conditioning, and facility-wide power monitoring. In many cases, addressing power quality significantly reduces unexplained automation failures by eliminating the recurring disturbances that gradually wear down sensitive hardware.
Infrastructure failures rarely happen in isolation. Aging PLCs, unsupported software, degraded networks, and unstable power systems tend to compound one another.
A legacy SCADA server running on obsolete hardware may already be fragile on its own. Add unstable network communications and poor power quality, and the probability of a serious failure increases dramatically. The problem is that these issues usually stay invisible right up until production stops.
That's why modernization efforts should focus not only on replacing hardware, but on improving maintainability, supportability, visibility, and long-term operational reliability across the whole environment.
For most manufacturers, proactive infrastructure modernization costs far less than responding to emergency downtime after a critical failure. Siemens' 2024 research found that large manufacturing plants still average roughly 27 hours of unplanned downtime per month, even after recent gains in predictive maintenance adoption. The gap between what's possible and what's happening is still significant — and largely addressable.
The warning signs are almost always there. Aging controllers running on borrowed time. SCADA systems that predate smartphones. Networks degrading packet by packet. Power events too brief to notice but damaging enough to matter. None of these problems announce themselves loudly, until one of them finally does, and production stops on a Tuesday afternoon with no clear explanation and no quick fix.
The manufacturers who avoid that moment aren't the ones with the newest equipment. They're the ones who decided to look honestly at what they had, address what was quietly failing, and build systems they could actually maintain.
That's exactly the work we do: helping manufacturers assess what's at risk, build a realistic modernization roadmap, and execute upgrades without disrupting the production they can't afford to lose. That decision means fewer emergency calls at 2am, fewer missed shipments, fewer conversations with leadership about why the line went down again. Because a plant that runs reliably isn't just hitting its numbers — it's the foundation everything else gets built on.
Ready to address those warning signs? Talk to an expert at Vertech about modernizing your facilities.