When should a PLC be upgraded?

A PLC should be upgraded when it becomes obsolete, unreliable, difficult to maintain, or incompatible with modern automation systems.

What are the risks of running an outdated PLC system?

Outdated PLC systems increase the risk of downtime, limited support, difficult maintenance, and compatibility issues with modern automation platforms.

Can PLC upgrades reduce downtime?

Yes, modern PLC systems improve reliability, provide better diagnostics, and reduce unexpected failures, helping minimise downtime.

What documentation is provided after a PLC upgrade?

Documentation typically includes updated electrical schematics, PLC software backups, I/O schedules, equipment lists, operating information and, where required, EPLAN drawings and as-built documentation. Accurate documentation helps simplify future maintenance, fault finding and future upgrades.

What happens during Factory Acceptance Testing (FAT)?

Factory Acceptance Testing (FAT) is carried out before equipment is installed on site. The control panel, PLC software and associated hardware are tested to verify functionality, communications, safety systems and control logic, helping to identify and resolve issues before delivery.

Why should legacy PLC systems be upgraded?

Legacy PLC systems become increasingly difficult to maintain as hardware becomes obsolete, support ends and downtime risks increase. Upgrading improves reliability, supportability and long-term operational stability.

Can PLC upgrades be completed without major downtime?

Yes. Many PLC upgrades can be completed using phased migration strategies, staged commissioning and planned shutdown windows to minimise production disruption.

Do you replace obsolete PLC hardware?

Yes. Stratos replaces obsolete PLC hardware and supports migration from ageing systems to modern platforms including Siemens, Allen Bradley and Mitsubishi.

What is included in a PLC migration project?

PLC migration projects typically include system assessment, software redevelopment, hardware replacement, testing, commissioning, documentation and operational support.

How do PLC upgrades reduce operational risk?

Modern PLC systems improve diagnostics, spare part availability, maintainability and integration capability, helping reduce unexpected failures and long-term maintenance risk.

PLC Upgrades & Migration Services UK

Stratos Control Systems specialise in PLC upgrades and migration, helping businesses replace outdated or unsupported, obsolete PLC systems with modern, reliable platforms.

We upgrade legacy PLCs to improve system performance, reduce downtime, and ensure long-term supportability, integration with third-party systems, all without unnecessary disruption to your operations.

Legacy PLC replacement projects often require new control panel manufacturing to accommodate modern hardware, communication networks and safety systems.

Whether you need a full PLC replacement or a staged upgrade, we deliver practical, engineered solutions tailored to your system.

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PLC Upgrade & Migration Services

We provide complete PLC upgrade services designed to modernise control systems and improve performance.

Legacy PLC Replacement

Replacement of obsolete PLC hardware
Migration to modern, supported platforms
Improved system reliability and performance

PLC Migration & Code Conversion

Conversion of existing PLC programs
Code optimisation and restructuring
Full documentation for long-term maintainability

System Integration & Expansion

Integration with existing control panels
Compatibility with SCADA and HMI systems
Expansion of system functionality

Testing, Commissioning & Support

Full system testing and validation
On-site commissioning
Ongoing support and troubleshooting

And industry we support food and beverage industrial automation

Signs Your PLC System Needs Upgrading

If your system shows any of the following, it may be time to upgrade:

Obsolete or unsupported PLC hardware
Limited availability of spare parts
Frequent system faults or downtime
Difficult fault finding or poor documentation
Poor system performance
Incompatibility with modern automation systems

Upgrading your PLC system reduces risk and improves operational reliability.

PLC Migration Without Disruption

Upgrading live automation systems carries risk. Our structured approach ensures upgrades are delivered safely and efficiently.

Our PLC migration approach is designed to:
Minimise downtime during upgrades
Maintain continuity of operations
Reduce risk during transition
Ensure seamless system integration

We carefully plan each upgrade to ensure a smooth transition from legacy to modern systems.

PLC Upgrades Often Require Control Panel Upgrades

Upgrading a PLC is rarely just about replacing the controller. As automation technology evolves, many legacy control panels require modifications to support new hardware, communications networks and operational requirements.

Older control panels may no longer have the space, power capacity or infrastructure needed for modern PLCs, HMIs and industrial networking equipment. During a PLC upgrade, it is often necessary to assess the condition of the existing control panel and determine whether targeted upgrades or refurbishment will improve long-term reliability and maintainability.

Typical control panel upgrades may include:

Replacing obsolete electrical components
Installing new PLCs, HMIs and communication modules
Upgrading power supplies and safety components
Improving cable management and panel layout
Adding capacity for future expansion
Updating terminal identification and labelling
Incorporating industrial Ethernet networking
Improving accessibility for maintenance and fault finding

Where the existing enclosure remains in good condition, control panel refurbishment can provide a cost-effective alternative to complete replacement. This approach allows organisations to modernise their automation systems while reducing downtime, extending the life of existing assets and improving overall system performance.

If you're replacing ageing equipment because of obsolete hardware or increasing maintenance costs, our guide on Difficulty Sourcing Obsolete Automation Parts provides practical advice on planning successful migration projects.

Control Panel Refurbishment

A PLC upgrade does not always require a completely new control panel. Where the existing enclosure is in good condition, a control panel refurbishment can provide a cost-effective way to modernise your automation system while minimising downtime.

Refurbishment may include replacing obsolete PLCs, upgrading safety components and power supplies, improving cable management, installing modern HMIs, updating electrical documentation and completing Factory Acceptance Testing (FAT) before installations.

Where a refurbishment is no longer practical, our Control Panel Design, Build & Manufacture service provides a fully engineered replacement designed to meet your operational and future expansion requirements.

Many refurbishment projects are delivered alongside our PLC Programming Services, ensuring the upgraded hardware and software are fully integrated, tested and commissioned.

We can also update electrical drawings through our EPLAN Control Panel Design service, providing accurate documentation to simplify future maintenance and support.

Whether your project requires a targeted refurbishment or a complete automation upgrade, Stratos delivers reliable, future-ready solutions that extend the life of your industrial control panels while improving performance and maintainability.

PLC Upgrade Strategies

We offer flexible upgrade approaches depending on your system and operational requirements.

Full PLC Replacement

Complete system upgrade to a modern platform
Ideal for obsolete or unsupported systems

Staged PLC Migration

Gradual upgrade of system components
Reduced risk and minimal disruption

Code Re-Engineering & Optimisation

Improve existing PLC logic
Increase efficiency and maintainability

Integration with Automation Systems

Our PLC upgrades integrate with a wide range of industrial automation systems:

Control panel systems
SCADA and HMI systems
Industrial networks (Ethernet/IP, Profinet, Modbus)
Drives, motors, and automation equipment

Delivering complete, modern automation solutions.

Industries We Support

Our PLC upgrade services are used across a wide range of industries, including:

Manufacturing
Food & Beverage
Pharmaceutical
Packaging
Utilities & Infrastructure
Heavy Engineering

Why Choose Stratos Control

Specialists in legacy PLC migration
Minimal disruption to operations
Clear, structured, and documented code
Improved system performance and reliability
UK-based automation engineers

Our team provides both PLC migration services and control panel fabrication to minimise project risk and simplify implementation.

Frequently Asked Questions

Upgrade Your PLC System

If your PLC system is outdated or unreliable, Stratos Control Systems can help modernise it with minimal disruption.