​Difficulty Sourcing Obsolete Automation Parts
Many industrial facilities continue to rely on automation systems that were installed decades ago.
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While these systems may still support daily operations, a growing challenge is making them maintainable when critical components fail.
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Engineering and maintenance teams are increasingly struggling to source obsolete PLCs, ageing HMI hardware, communication modules and legacy control system components. When replacements are unavailable, downtime increases, costs rise and operational risk grows.
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At Stratos Control Systems, we help engineering teams assess obsolescence risk, develop modernisation strategies and reduce dependency on unsupported automation systems.
Why Obsolete Automation Parts Are Becoming a Serious Risk
Industrial automation technology evolves rapidly.
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Manufacturers regularly:
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Discontinue older hardware
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End software support
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Phase out spare parts
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Introduce replacement product lines
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However, many facilities continue operating ageing systems because:
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Existing systems still function
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Upgrades appear disruptive
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Modernisation projects are delayed
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Budgets are constrained
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The result is increasing dependence on hardware that is becoming harder to support every year.
Common Obsolete Components Creating Operational Problems
Legacy PLC Platforms
Many facilities still rely on:
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Siemens S5
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Allen-Bradley PLC5
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Allen-Bradley SLC 500
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Older Mitsubishi platforms
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Legacy Omron systems
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These systems often have limited spare availability, reduced manufacturer support and require specialist engineering knowledge.
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Ageing HMI and SCADA Hardware
Older operator panels, industrial PCs, SCADA servers and display hardware can become increasingly difficult to replace.
As components fail, organisations often discover compatible replacements are no longer available.
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Obsolete Communication Networks
Many older systems rely on:
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Proprietary protocols
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Serial communications
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Unsupported networking hardware
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These create significant challenges when integrating modern systems or expanding automation infrastructure.
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Third-Party OEM Equipment
Packaged machinery often contains:
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Proprietary controllers
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Custom hardware
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Unsupported modules
Failures in these systems can create significant operational disruption when replacement parts are unavailable.
The Operational Impact of Obsolete Parts
Increased Downtime Risk
When critical components fail and replacements cannot be sourced quickly:
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Recovery times increase
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Production stoppages last longer
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Emergency sourcing becomes necessary
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Higher Maintenance Costs
Obsolete hardware often results in:
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Secondary-market purchases
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Contractor dependency
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Urgent repair work
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Temporary engineering workarounds
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Maintaining ageing systems becomes increasingly expensive over time.
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Reduced Reliability
Older systems are more prone to:
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Hardware degradation
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Intermittent faults
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Communication failures
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Unpredictable performance
This reduces confidence in the automation infrastructure supporting production.
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Greater Operational Uncertainty
Engineering teams often lack confidence when:
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Critical spares are unavailable
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Recovery strategies are unclear
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Equipment failures become difficult to predict
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This uncertainty creates ongoing operational risk.
Signs Your Facility Has Obsolescence Risk
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Common indicators include:
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Spare parts are becoming difficult to source
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OEM support has ended
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Legacy systems remain in critical production areas
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Backup hardware is limited or unavailable
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Engineers avoid modifying ageing systems due to risk
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If these issues sound familiar, your organisation may already be carrying significant obsolescence risk.
Download the Obsolete Automation Parts Risk Assessment Guide
Many organisations do not realise how exposed they are to obsolete PLCs, unsupported hardware and unavailable spare parts until a critical failure occurs.​​
Download the Obsolete Automation Checklist
Download our guide to learn:
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How to identify obsolete automation components
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Which systems create the highest downtime risk
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How to assess spare part availability
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When to repair, retrofit or replace ageing systems
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How to develop a phased modernisation roadmap
Why Obsolescence Becomes More Dangerous Over Time
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As automation systems age:
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Support options reduce
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Replacement parts become scarce
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Knowledge dependency increases
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Recovery times grow longer
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Eventually failures become business-critical events rather than routine maintenance activities.
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The risk is not simply that systems fail.
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The risk is that they cannot be recovered quickly when they do.
The Hidden Cost of Delaying Upgrades
Many organisations delay modernisation because the system still appears to be working.
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However, delaying upgrades often increases:
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Downtime exposure
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Maintenance costs
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Operational uncertainty
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Emergency replacement risk
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When failures eventually occur, emergency upgrades are typically more disruptive, more expensive and more technically challenging than planned modernisation projects.
What Good Obsolescence Management Looks Like
Effective lifecycle management includes:
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Obsolescence risk assessments
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Spare part strategies
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Planned modernisation roadmaps
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Backup management
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Standardisation initiatives
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This enables engineering teams to reduce risk and improve long-term reliability.
How Stratos Helps Reduce Obsolescence Risk
We help engineering teams:
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Assess automation obsolescence risk
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Modernise legacy PLC systems
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Reduce downtime exposure
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Improve long-term maintainability
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Develop practical upgrade roadmaps
Reduce Obsolescence Risk Before Failures Force Action
If your facility is struggling to source obsolete automation components or depends on unsupported systems, now is the time to reduce risk before failures become critical.
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Stratos Control Systems helps engineering teams modernise ageing infrastructure and improve long-term operational reliability.
