Browsing by Author "Yehorova, Victoria"

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    Controllers (PLC) safety (safety relay). Overview. Primary requirements. Features of the application
    (National Aviation University, 2021-04-28) Yehorova, Victoria; Єгорова, Вікторія Олександрівна
    Many machines and robots require safety circuits to stop all or part of an operation in the event of an emergency event. These safety circuits are typically configured using safety relays, or a safety-rated programmable logic controller (PLC) or other safety-rated controller. One or more multi-function safety relays can often be used to replace many basic single-function safety relays, simplifying installations and saving money. In other cases, multi-function safety relays can be used instead of a safety-rated PLC, resulting in substantial savings while streamlining implementation and maintenance. Most safety relay designs have traditionally used safety relays constructed with internal electromechanical, forceguided relays. The key advantage here is voltage flexibility, as nearly any typical control voltage can be switched. Typical voltages include: 5 V DC,12 V DC, 24 V DC, 120 V AC and 230 V AC. The nominal current at 24 V DC is about 6 amps for a resistive-based load. Contrast this with a safety controller. A safety controller is a solid-state device. This means that its outputs are “transistorized” and only designed to switch 24 V DC at a typical maximum of 2 amps. If you plan on controlling a higher power relay or contactor, then these outputs will work fine. However, if you are using a safety relay to control the final load switching using voltages other than 24 V DC, then this is an important consideration. Safety controllers are typically modular, so safety I/O can be added. The safety I/O expansion modules are either solid-state or electromechanical. If safety controller expansion modules are needed, these costs will be an important consideration. Expansion modules can also be added to a safety relay system.
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    The world's main manufacturers of programmable logic сontrollers. Overview
    (National Aviation University, 2021-04-28) Yehorova, Victoria; Єгорова, Вікторія Олександрівна
    Programmable Logic Controller (PLC) has been extensively used in the manufacturing industry to automate the manufacturing processes, including making logical decisions in the assembly line, controlling robotic devices, and diagnosing process faults. The recent increase in industrial automation and advent of Industry 4.0 have bolstered the demand for PLCs. The are looking for innovation including compact PLCs and increased I/O capacity of PLCs that enhances the functionality of devices. Siemens (Germany). Siemens offers a wide range of products and solutions to various industrial companies mainly process and manufacturing industries. The company provides automation technologies, industrial controls, and industry software that help customers to optimize the complete product development and production processes. The company offers SIMATIC range of controllers. It provides four varieties of SIMATIC PLCs, namely basic, advanced, distributed, and software controllers.