Robust PLC control systems engineered for reliability, flexibility and long-term operational resilience.
PLC systems sit at the core of modern industrial operations. At FAIRFIELDS, we design, implement and support PLC-based control systems that provide dependable performance across high-risk, high-consequence environments. From standalone machine control to fully distributed and redundant architectures, we tailor each system to meet operational, safety and lifecycle requirements. Our engineers work with leading platforms and integrate PLCs into wider control, safety and digital infrastructures to ensure your operation remains efficient, maintainable and future-ready.
Enquire about PLC systemsPLC systems sit at the core of modern industrial operations. At FAIRFIELDS, we design, implement and support PLC-based control systems that provide dependable performance across high-risk, high-consequence environments. From standalone machine control to fully distributed and redundant architectures, we tailor each system to meet operational, safety and lifecycle requirements. Our engineers work with leading platforms and integrate PLCs into wider control, safety and digital infrastructures to ensure your operation remains efficient, maintainable and future-ready.
Programmable Logic Controllers have evolved from simple relay replacements into powerful control and data platforms. Today, PLCs not only execute control strategies but also connect plant assets to supervisory systems, enterprise platforms and digital tools.
At FAIRFIELDS, we deliver PLC systems as part of a fully integrated Engineering, Control and Digital capability. We design architectures ranging from single controllers to distributed, networked and failsafe systems, depending on the level of resilience, availability and safety required.
Our team has extensive experience with major PLC manufacturers including Siemens, Rockwell and Schneider, alongside other established platforms. Software is developed in-house using appropriate languages such as Ladder Logic, Structured Text and Sequential Function Chart to suit the application.
We support the full lifecycle of PLC systems, from feasibility and specification through to design, supply, installation, commissioning and long-term support. Where legacy or obsolete systems are in place, we plan and execute controlled migrations that protect uptime while preparing your facility for future expansion.
Our approach focuses on clarity, maintainability and performance. Every PLC system is designed to meet operational demands while supporting safety, cybersecurity and data integration requirements from the outset.
Our PLC capability includes:
• Standalone and distributed PLC architectures
• Redundant and high-availability systems
• Failsafe and safety PLC integration
• PLC migration and legacy system upgrades
• Integration with SCADA, HMI and IIoT platforms
• Network design and remote I/O configuration
• Full Factory and Site Acceptance Testing
• Long-term service, support and optimisation
But what does it included?
PLC Architecture & System Topology
Every PLC system begins with the right architecture. We design topologies ranging from standalone machine controllers to distributed, networked and fully redundant platforms.
By selecting the appropriate CPU configuration, remote I/O strategy and communications structure, we balance cost, resilience and performance. Our designs eliminate unnecessary complexity while ensuring availability, maintainability and long-term support.
Redundant & High Availability Systems
Where downtime is not acceptable, we implement redundant PLC architectures. This may include dual processors, redundant power supplies, distributed I/O and resilient network structures.
High availability systems are engineered to remove single points of failure and maintain operation during hardware faults or maintenance. We configure, test and validate failover strategies to ensure predictable, controlled behaviour under all conditions.
Failsafe & Safety PLC Integration
For safety-related applications, we integrate certified safety PLC platforms in accordance with BS EN ISO 13849 and IEC 62061.
Our TÜV-accredited engineers develop safety functions based on formal risk assessment and required Performance Level or SIL targets. Where appropriate, safety and standard control functions are integrated within a single platform, reducing complexity while maintaining compliance and traceability.
PLC Software Design & Standards
Well-structured software is critical to long-term system reliability. We develop PLC software using recognised programming languages including Ladder Logic, Structured Text and Sequential Function Chart.
Clear documentation, version control and structured naming conventions are applied from the outset. This ensures future modifications can be implemented efficiently and safely, whether by FAIRFIELDS or client engineering teams.
PLC Migration & Lifecycle Support
Obsolete PLC platforms present operational and security risks. We assess legacy systems, identify hardware constraints and develop phased migration strategies that protect uptime.#
Our lifecycle support includes hardware upgrades, firmware management, software refactoring and long-term service agreements. The objective is controlled evolution — not disruptive replacement.