Programmable Logic Controllers (PLCs)
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What is a PLC?
PLCs are ruggedized microcomputers with hardware and software specifically designed to perform industrial control operations. A PLC consists of two basic sections:
- the CPU central processing unit controls all PLC activity and can further be broken down into the processor and memory system
- the input/output interface system is physically connected to field devices such as switches, sensors, lights, and motors, and provides the interface between the CPU and the field devices (inputs and outputs)
PLCs are used to control machines or processes that are sequential in nature, and PLCs also can control continuous
processes that use analog I/O.
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How PLCs Work
For all types of applications, the PLC performs three functions. The PLC CPU ...
- Reads input data from connected field devices through the use of its input interfaces
- Executes or performs the control program that has been stored in its memory system. Programs are typically created in ladder logic, a language that closely resembles a relay-based wiring schematic.
- Writes or updates output devices based on the program via the output interfaces.
This process, known as the PLC scan, typically continues in the same sequence without interruption, and changes only when a change is made to the control program.
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PLCs and PLC Products
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DirectLOGIC Programmable Logic Controllers
Koyo's DirectLOGIC programmable controller products, supplied through AutomationDirect, range from nano-sized fixed I/O units to modular systems with thousands of I/O. From simple machine sequencing to process control, you will find a quality programmable controller to suit your application at a fraction of the cost typically charged by our competitors.
- DL05 Micro Brick PLC - Incredible
features with an expansion slot
- DL06 Expandable Micro Brick PLC - 36 I/O and four expansion slots
- DL105 Micro Brick PLC - Fixed-I/O with 10 inputs and eight
outputs
- DL205 Micro Modular PLC - Powerful with a wide range of I/O and comm modules
- DL305 Small Modular PLC - Marketed under
various PLC name brands for over 24 years
- DL405 Small Modular PLC - Specialty modules for complex applications
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CLICK™ Micro Brick Programmable Logic Controllers
The CLICK PLC family of components offers practical PLC features in a compact yet expandable design, with super easy-to-use FREE programming software. CPU units start at just $69.00
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- A powered CLICK CPU unit can function as a complete PLC system with eight inputs and six outputs.
- For expansion, eleven option modules are available for configurations up to 142 I/O.
- All Click CPUs support 8K steps of program memory and 8K words of data memory.
- The CLICK user-friendly programming software features 21 practical relay ladder logic and function block instructions supported by extensive online help files. The software is a free download.
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ZIPLink Pre-Wired PLC Connection Cables & Modules
ZIPLinks cut PLC wiring time from hours down to minutes. The ZIPLink system eliminates the normally tedious process of wiring programmable logic controller I/O to terminal blocks.
- Simply plug one end of a ZIPLink cable into a DirectLOGIC I/O module and the other end into a ZIPLink connector module. It’s that easy.
- ZIPLinks use half the space, at a fraction of the total cost of terminal blocks
- ZIPLink cables and modules are available in a variety of styles to suit your needs.
Some are designed exclusively for DirectLOGIC PLCs. Others may be used with various PLC brands
- ZIPLinks are available for our most popular discrete input and output PLC I/O modules
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AutoCAD Compatible Schematic Software
ECT promis•e® is software for control system design. It generates control system schematics, panel layouts, bills of material, wire lists, terminal plans and more to automate the electrical systems design process. ECT’s promis·e package offers many benefits, including a large number of supported parts and symbols. Two levels of promis•e® software are available.
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