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PLC, PAC OR PC? WHICH SHOULD YOU CHOOSE? PRODUCTS MACHINE BUILDING, FRAMEWORKS & SAFETY
Choosing a programmable logic controller (PLC), process automation controller (PAC) or industrial PC (IPC) hinges on a series of crucial decisions dictated by the specific application. A PLC is considered the foundational,
standard controller that is primarily designed for straightforward, robust, control tasks. A PAC builds on the capabilities of a PLC, offering additional features and greater flexibility for more complex automation needs. An IPC can run the same software as a PAC but includes all the capabilities of a personal computer, providing extensive processing
power and connectivity options. But what are the differences between each of these? PLCs: Today’s PLCs execute preprogrammed instructions, often in ladder logic or other
structured languages. Usually used in conjunction with SCADA systems, they monitor inputs from sensors, make logical decisions and control outputs to actuators, like motors. These are a popular choice for small-scale projects, with advanced PLC models handling remote Input/Output (I/O) and motion control, providing greater flexibility and functionality for complex automation tasks. As an example, a PLC in the food industry could be used to detect burnt potato chips on an assembly line and automatically remove them. PACs: PACs use exception-based logic rather than ladder logic, so can handle events or
exceptions as they occur rather than following a sequential process. They can efficiently manage complex applications, such as advanced process control and motion control, by responding dynamically to real-time changes and conditions in the system. A PAC, for example, could control high-speed multi-axis robots, manage sophisticated vision systems or conduct extensive data logging, all while seamlessly interfacing with SCADA systems and Human Machine Interfaces (HMIs). However, while PACs generally offer more advanced functionality and better performance, they are also more expensive than PLCs. As technology advances and R&D costs decrease, the distinction between the two types of controllers is likely to become less clear. IPCs: An industrial PC is a rugged computer designed for industrial or harsh
environments. These can support standard hardware interfaces, such as USB and PCI, ensuring easy integration with various everyday peripherals. Engineers can also use frameworks like .NET and tools like Visual Studio to create customised applications and interfaces for specific industrial needs. IPCs can also manage tasks parallel to the operating system (OS). This means that
critical real-time tasks, such as control processes or data acquisition, can operate independently and concurrently with the OS without being disrupted by changes or updates to the OS itself. In addition, their operating systems allow the use of media players, PDF viewers, text editors and CAD suites. So which one should you choose? PLCs are often ideal for standalone machines. Yet
if motion control, safety integration or managing remote I/O are needed, a PAC is typically the better choice. For applications with advanced features or extensive software requirements (beyond what a PAC could provide), an IPC could be the appropriate solution. If the total cost of ownership is a determining factor, investing more initially can
save money over time by meeting future scalability needs. Companies likes Foxmere can advise on the right controller for your application.
Foxmere T: 01922 349999
https://foxmere.com/en DEVELOPING A CUSTOMISED JOYSTICK
When Fendt contracted RAFI to develop a new generation of loader joystick for intuitive and simplified operation of loaders and various implements, a number of features were requested. The new joystick needed to have a third valve, enabling simultaneous control of up to three loader functions, e.g. lifting the loader with bale gripper, retraction, and closing the bale gripper. It also needed to enable comfortable control of tractor functions and complex ISOBUS-based implements such as potato harvesters, viticulture machines, and municipal machines. To meet requirements, RAFI developed the fully configurable 3L joystick by expanding on its
JOYSCAPE MULTI basic model. The 3L joystick integrates the standard loader joystick functions – control of the hydraulic valves or loader operation as well as control of the third and fourth hydraulic circuits – but also a thumb joystick to operate the third loader function. Not only can functions be freely assigned to
up to 27 levels, but the joystick features a freely configurable pushbutton which, with the standard reversing function, means the driver does not have to change hand position when using the loader. Function allocation is visible on the terminal. The joystick is secured against accidental operation. RAFI developed the splash- and dust-proof
18 DESIGN SOLUTIONS JULY/AUGUST 2024
joystick with IP5K4 degree of protection in compliance with ISO25119 Directives AgPL C.
RAFI
rafi-group.com
sponsored by
Feature
NEW SOFT STARTER INCREASES MACHINE COMPETITIVENESS
New from Schneider Electric is the Altivar Soft Starter ATS130. This is designed to enable OEMs, machine builders and panel builders to optimise the design of their machine as well as to reduce the need for preventative maintenance, increase the performance, and extend the lifespan of electric motors in a wide range of industrial applications. With a power range from 11kW to 55kW, this delivers
increased mechanical and electrical flexibility, increased operational efficiency, and optimised motor management compared to direct-on-line starters, the company explains. Easy to install side-by-side, by DIN rail mounting or back
plate, the compact ATS130 enables engineers to reduce both their cabinet size and installation time. The soft starter is the same width as the Schneider Electric’s TeSys Deca circuit breaker and it has a direct connection so it can be integrated easily to create a compact soft motor starter assembled in a single block, covering short-circuit protection, motor thermal protection, phase loss and phase unbalance protection, as well as soft start and stop functions. The soft starter will increase machine competitiveness
by providing: • Advanced Motor Protection: The ATS130 is equipped with comprehensive motor protection functionalities to prevent overload, phase failure, and excessive temperature, as well as to lengthen system lifecycles. • Optimised Performance: The ATS130 provides precise control over motor acceleration and deceleration, reducing mechanical wear and tear and minimising energy consumption. • Versatile Applications: Designed to meet the demands of various industries, the ATS130 is suitable for pumps, fans and compressors in applications ranging from water treatment plants and HVAC systems, to mining operations and manufacturing facilities.
Schneider Electric
www.se.com/uk/en
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