Industrial PLC and PAC Solutions
Programmable Logic Controllers (PLCs) and Process Automation Controllers (PACs) are at the core of today’s smart, connected industrial systems. They serve as the decision-making and control hubs for everything from discrete manufacturing to large-scale, continuous process operations.
At Relevant Solutions, we deliver PLC and PAC technologies that offer exceptional performance, reliability, and flexibility. Whether you’re upgrading legacy infrastructure or designing a fully integrated industrial automation system, our team can provide the right control architecture to help improve efficiency, reduce downtime, and support future scalability.
PLCs are designed to handle high-speed, deterministic control of machinery, equipment, and processes in harsh environments. They excel at real-time logic execution, typically using Ladder Diagram (LD), Function Block Diagram (FBD), or Instruction List (IL) programming languages. These are ideal for factory automation, material handling, and robotics.
PACs, while offering similar rugged reliability, extend the control capabilities into more complex and integrated operations. They support multi-domain control, sophisticated data handling, and higher-level tasks such as recipe management, asset monitoring, and enterprise communication. PACs typically leverage Structured Text (ST) and Sequential Function Charts (SFC), making them suitable for batch production, multi-loop process control, and hybrid manufacturing applications.
To meet the diverse needs of modern industries, we proudly offer Emerson’s range of PLC & PAC solutions, a top brand with a legacy of innovation and advanced automation capabilities since the mid-1980s, ensuring the right solution for every application.
Applications of PLCs & PACs
PLCs and PACs are used across a wide range of industries due to their adaptability, performance, and ability to integrate with modern digital ecosystems like SCADA, MES, and cloud-based analytics platforms.
Food & Beverage
These controllers ensure precise control over batching, blending, pasteurization, and packaging operations. PACs support traceability, data logging, and recipe management, all of which are vital for food safety compliance and consistent product quality. Integration with HMI and SCADA systems allows for easy monitoring and audit tracking.
Oil & Gas
Controllers are used in drilling rigs, compressor stations, well pads, and refineries. PACs, in particular, support complex process control loops and advanced supervisory logic needed in volatile environments. Their redundant architectures and rugged designs ensure reliable operation in hazardous areas with minimal maintenance.
Water & Wastewater Treatment
Controllers are used in pump stations, UV disinfection, chemical dosing, filtration, and reservoir management. PACs help manage changing flow rates, pH levels, and pressure differentials through advanced PID control. SCADA integration allows for centralized oversight, enabling municipalities to remotely manage water quality, flow control, and regulatory compliance.
Power & Utilities
PLCs and PACs control turbines, generators, voltage regulation, load shedding, and grid interface systems. They provide fast response times for real-time load adjustments and integrate with condition monitoring systems for predictive maintenance, enhancing uptime and reducing the risk of blackouts or overloading.
Manufacturing Automation
From automotive assembly lines to consumer electronics production, PLCs and PACs handle real-time control of motors, actuators, conveyors, and robotic systems. They enable high-throughput production, advanced diagnostics, and remote access for troubleshooting. Integrated safety logic also allows these controllers to serve dual purposes, supporting both process control and safety compliance.
Tailored PLC & PAC Solutions
At Relevant Solutions, we provide end-to-end support for customized automation control systems, from hardware selection to engineering, programming, and commissioning. Whether you’re seeking to automate a single process or modernize an entire facility, we can develop control architectures that scale with your needs and deliver measurable improvements in safety, productivity, and reliability.
Our team partners with leading control manufacturers and integrators, ensuring we bring the latest technologies and best practices to your project. Our field services team also supports long-term operation with preventive maintenance, controller upgrades, and remote diagnostics.
Contact us today to learn how our PLC and PAC solutions can help drive your plant’s performance, reduce operational risks, and deliver real-time insight into your operations.
Emerson PACSystems™ RX3i
Emerson PACSystems™ RSTi-EP
RSTi EP CPUs bring the power of PACSystems™ to compact applications. They run the same programming environment as RX3i controllers, making it easy to reuse application libraries when scaling down. These units offer real time status and remote diagnostics, and include dual LAN ports, an RS 232 serial interface and support for PROFINET and DNP3 communication. The small DIN rail footprint houses up to 1.5 MB of non volatile memory and features a built in multi port switch that simplifies wiring and network redundancy. Security is also a priority, with Trusted Platform Module hardware, secure boot technology and encrypted firmware updates.
