25977-1

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25977-1 is a standard application field and working principle. It is commonly referred to as an "Industrial Safety Related Automation" standard. This standard encompasses virtually all aspects of industrial automation safety, including requirements for emergency stop, delay/restart, invulnerability of electronic and/or mechanical mitigation components, functional safety assessment of a system, and so on. The standards and regulations implementing this standard vary from country to country. For example, in the United States, the 29 CFR 1910.217 standard is in place to guide the implementation of this standard for industrial safety-related products and systems.In general, 25977-1 is intended to provide guidelines for the development of industrial safety-related products and systems. Its primary goals are to reduce the likelihood of harm to people and property when operating these systems. For this purpose, it defines a number of requirements that must be met in order for a product or system to be certified compliant with this standard. These requirements include the following:• An emergency stop function that is able to quickly and reliably interrupt the energy supply to stop a machine or system in a hazardous situation.• Installed and operational mitigation components that can reduce the likelihood of harm to personnel or property caused by a malfunctioning machine or system.• The ability of the system to properly respond to conditions that require some degree of delay in restarting the system’s operation.• The ability of the system to recognize certain inoperable components and to rely on functioning components.• The ability to design the system such that it is invulnerable to certain types of hazardous conditions or system failures.• The ability of the system to conduct a functional safety assessment and to identify potential hazardous events that may occur.The scope of the 25977-1 standard covers virtually all aspects of industrial safety-related products and systems, including hardware, software, economic aspects, human factors, and environmental aspects. It also covers the design, selection, installation, use, maintenance, and repair of safety-related products and systems. This standard is widely accepted and implemented in many countries, and is covered by a variety of international standards and regulations.The implementation of the 25977-1 standard involves a systematic approach that starts with the identification of hazards posed by the product or system. After those hazards are identified, appropriate mitigation components are then evaluated and the functional safety assessment must be completed. The purpose of the assessment is to make sure that the requirements laid out in the 25977-1 standard are met, and that the system is able to operate safely and reliably under normal and hazardous conditions. The 25977-1 standard also provides guidance on the design of a safety-related system. This includes considerations of how the system is installed and how it should be used. It also includes guidelines for performing periodic inspections and maintenance on the system, so that any safety-related issues can be quickly addressed before they become a problem.Overall, the 25977-1 standard provides a comprehensive framework for the development of industrial safety-related products and systems. By following this standard, manufacturers can ensure that their products and systems are compliant with international standards and regulations, and provide the necessary level of safety and protection for personnel and assets.

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