Programable Logic Controller (PLC)
At Control Design Supply, we provide a wide selection of programmable logic controllers (PLCs) to power modern industrial automation. PLCs are the brains behind machinery, enabling systems to react, monitor, and make decisions based on sensor inputs, timers, and programmed logic. Whether you're automating a manufacturing line, integrating a process system, or upgrading legacy equipment, we have the PLC solutions to make your control system smarter, faster, and more reliable.
From compact, all-in-one PLCs to modular rack-mounted systems, our inventory supports a variety of industries and control requirements. We work with OEMs, system integrators, and plant maintenance teams to deliver powerful automation tools that keep operations efficient and scalable.
From compact, all-in-one PLCs to modular rack-mounted systems, our inventory supports a variety of industries and control requirements. We work with OEMs, system integrators, and plant maintenance teams to deliver powerful automation tools that keep operations efficient and scalable.
What Is a PLC?
A programmable logic controller (PLC) is a digital computer designed for industrial automation. PLCs are used to control machinery and processes based on programmed logic, typically written in ladder logic, function block, or structured text. They receive input signals from sensors and switches, process those signals according to custom logic, and output control signals to actuators, relays, lights, motors, and more.PLCs are known for their durability, real-time processing, and ability to operate in harsh environments. They’re used in everything from simple machines to large-scale manufacturing systems with complex logic and interlocks.
Why Are PLCs Important?
PLCs serve as the foundation of industrial control systems. They offer flexible automation capabilities that replace hardwired relays and timers, making systems easier to modify, scale, and maintain. A well-configured PLC enhances system uptime, reduces manual intervention, and allows seamless integration with HMIs, SCADA systems, and smart sensors.By using PLCs, companies can:
- Increase productivity through automation
- Reduce wiring and panel space
- Improve troubleshooting with real-time diagnostics
- Adapt quickly to changes in production or system logic
- Minimize downtime with reliable, field-proven control
Types of PLCs We Offer
- Compact PLCs – Integrated units ideal for small systems and OEM applications
- Modular PLCs – Expandable rack systems that allow for flexible I/O and communication options
- I/O Modules – Digital and analog input/output options for signal acquisition and control
- Logic Relays – Smart relays with limited PLC functionality for basic automation tasks
- Communication Modules – Ethernet, Modbus, Profibus, and other protocols for networked control
- Expansion Units – Add-on modules for additional I/O, memory, or communication support
PLC Applications
PLCs are used across virtually every sector that depends on automation. Common use cases include:- Automated manufacturing lines
- Conveyor systems and packaging lines
- Pumps, fans, and motor control
- Temperature and process regulation
- Building management and lighting control
- Water and wastewater treatment systems
Whether you're building a new system or retrofitting an older machine, we have the PLC hardware to match your design goals and application requirements.
Why Buy PLCs from Control Design Supply?
When you partner with Control Design Supply, you get more than a part number—you get knowledgeable support, fast access to the right components, and trusted automation brands. We help customers across industries build scalable, efficient systems using proven PLC technology.
- Expert guidance for product selection and compatibility
- Stocked components ready for quick delivery
- Support for programming, networking, and integration
- Ideal for OEMs, MROs, integrators, and panel builders
Not sure which PLC fits your application?
Contact us today and let our experts help you design or upgrade your control system.