Automation & robotics
Programmable logic controllers
Programmable logic controllers (PLCs) and related controllers that read inputs from sensors and switches, run user-written logic and drive outputs to motors, valves and indicators in machines, lines and process plants.
Overview
A PLC is a ruggedised industrial computer that repeatedly scans its inputs, executes the control program and updates its outputs, while running self-diagnostics. Programs are written in standard IEC languages including ladder diagram, function block diagram, structured text, instruction list and sequential function chart. Modular designs let I/O, communication and special-function modules be added as the system grows. PLCs exchange data with HMIs, SCADA and MES systems for visualisation, alarming and reporting, and increasingly feed data to IIoT platforms. Programmable automation controllers and industrial embedded controllers extend this into more data-heavy or specialised applications.
Selecting a PLC
Count the digital and analogue I/O with spare capacity, and identify special functions such as high-speed counting, motion or PID control. Confirm the communication protocols needed for drives, HMIs and plant networks, the supply voltage, panel space and environmental conditions, and any requirement to standardise on a platform already used on site.
Range overview
- Types and variants
- Compact PLC
- Modular PLC
- Programmable Automation Controller (PAC)
- Industrial Embedded Controller
- I/O Expansion Modules
- Communication Modules
- Features
- Ladder, FBD, ST, IL and SFC Programming
- Modular I/O
- Self-Diagnostics
- HMI and SCADA Connectivity
- IIoT Data Collection
Exact specifications depend on the variant, material and size. Confirm ratings and certification against the datasheet or with our engineers before ordering.
Applications
- Machine Control
- Assembly Line Control
- Robotic Cells
- Process Sequencing
- Alarming and Reporting
- Remote Data Collection
Industries
- Manufacturing
- Packaging
- Water and wastewater
- Material handling
Information that speeds up a quotation
Share what you know. Anything you are unsure of can be marked “not known” — our engineers will help confirm it.
- Brand approval
- Power
- Voltage
- Phase
- I/O count
- Communication
- Environment
- Certification
Need a datasheet?
Add this family to your enquiry list and mention the variant — we will send the relevant technical documents.
Electrical and controls
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Frequently asked questions
What information is needed to propose a PLC?
Provide an I/O list or a description of the machine or process, the number of digital and analogue signals, any high-speed, motion or PID functions, the devices it must talk to (drives, HMIs, SCADA) and their protocols, and the supply voltage. Mention if the site has a preferred platform for spares and maintenance reasons.
What is the difference between a PLC and a PAC?
Both control machines and processes. A PLC is optimised for fast, deterministic scanning of discrete and analogue I/O. A PAC typically adds more memory, processing power and networking, which suits applications combining control with heavier data handling, motion or multiple communication networks. The line between them has narrowed in modern controllers.
Ready to specify programmable logic controllers?
Send the details you have — quantities, sizes, drawings or a part number. Unknowns are fine.