How to Reduce Reliance on Individual Engineers in Industrial Control Systems
- 2 days ago
- 3 min read
Why Key-Person Dependency Becomes a Hidden Risk
In many industrial environments, certain engineers become essential to keeping systems running.
They understand the PLC logic.They know the quirks.They are the people everyone calls when something goes wrong.
At first, this looks like a strength.
Over time, it becomes a risk.
When systems rely on individuals instead of structure, operations become fragile, and performance becomes dependent on availability rather than design.
What Causes Systems to Depend on Individuals
Reliance on individual engineers is usually not intentional. It develops over time as systems evolve without structure.
Common causes include:
Incomplete or outdated documentation
Inconsistent system design across machines or sites
Poorly structured PLC logic
Lack of standardisation
Systems designed for delivery, not long-term support
These issues mean that knowledge is held by people rather than embedded in the system itself.
Why This Creates a Serious Operational Risk
Delays During Faults
When only certain engineers understand the system, fault finding slows down if they are unavailable.
Knowledge Bottlenecks
New engineers take longer to onboard, and knowledge is not easily shared across teams.
Pressure on Key Individuals
Over-reliance on specific engineers increases workload and reduces team resilience.
Higher Long-Term Costs
Maintenance becomes less efficient, upgrades become more complex, and downtime becomes less predictable.
The system continues to operate, but only under the right conditions.
Where Key-Person Dependency Comes From
Poor or Missing Documentation
Without accurate documentation, engineers rely on memory and experience rather than structured information.
This makes system knowledge difficult to transfer.
Inconsistent System Design
When control systems vary across panels, machines, or sites, engineers must relearn each system.
There are no consistent patterns to follow.
Poorly Structured PLC Logic
Complex or unclear PLC programs make it difficult to navigate logic.
This often leads to reliance on the original developer.
Lack of Standardisation
Without standards, every system becomes a one-off.
There is no shared engineering approach across the organisation.
Systems Designed for Delivery, Not Lifecycle
Many systems are built to work at commissioning, but not to be maintained over time.
This creates long-term dependency on individuals who understand how the system evolved.
What Well-Designed Systems Look Like
In structured environments, the system holds the knowledge, not the individual.
These systems typically include:
Consistent and standardised design across systems
Accurate, up-to-date documentation
Clear and structured PLC logic
Standard panel layouts
Systems that engineers can navigate without prior exposure
This allows teams to move between systems with confidence.
How Reducing Dependency Improves Operations
When systems are structured and consistent:
Fault finding becomes faster and more predictable
Teams become more flexible and resilient
New engineers onboard more quickly
Maintenance becomes more efficient
When dependency remains:
Downtime increases
Risk grows over time
Teams become less scalable
How to Reduce Reliance on Individual Engineers
Standardise Control System Design
Use consistent PLC structures, naming conventions, and panel layouts across systems.
This creates familiarity and reduces learning time.
Improve Documentation
Ensure documentation reflects the system as it exists, not just how it was designed.
Maintain clear I/O structures and track system changes over time.
Structure and Simplify PLC Logic
Use modular programming and clear logic separation.
Avoid unnecessary complexity that makes systems harder to understand.
Design for Maintenance
Make systems easy to access, understand, and diagnose.
Focus on real-world operation, not just commissioning.
Introduce Structure Through Upgrades
You do not need to rebuild everything at once.
Incremental upgrades can introduce structure and consistency over time.
The Cost of Doing Nothing
If systems remain dependent on individuals:
Operational risk increases
Downtime becomes less predictable
Engineering teams cannot scale effectively
Upgrades become more complex and expensive
This is a form of technical debt, and it compounds over time.
What to Know About Reducing Engineering Dependency
Why do control systems rely on individual engineers?
Control systems often rely on individuals due to poor documentation, inconsistent design, and lack of standardisation. This causes system knowledge to remain with specific engineers rather than being accessible across the team.
How can you reduce reliance on key engineers?
Reliance can be reduced by standardising system design, improving documentation, structuring PLC logic, and ensuring systems are built for long-term maintenance rather than just commissioning.
Does standardisation reduce flexibility?
No. Standardisation provides a consistent framework while still allowing controlled flexibility. It improves maintainability without limiting system functionality.
Struggling with Systems That Only a Few People Understand?
Reducing reliance on individual engineers starts with better system design.
Stratos Control Systems helps engineering teams build structured, maintainable systems that improve reliability, reduce risk, and support long-term performance.
