PLC machinery industries such as system security

Machinery safety is a complicated system engineering, need to consider many factors, such as machinery and equipment features, process operating characteristics, security design and so on. In general, the safety control system should include safety input device ( Such as scram button, security door limit switch or interlock switch, safety grating or screen, hands control button) And safety control electrical components ( Such as safety relays, safety PLC and bus) Security and output control, Such as in the primary loop contactor, relay or valve, etc. ) 。 Among them, the safety is in the application of PLC to focus on the product. A safety PLC is designed for demanding tasks or safety related application and design of the PLC, when the failure will not bring danger to personnel safety or process safety. In a safety PLC controller according to the requirements to the certain reliability or failure probability level, means that it has a wide range of self-diagnosis ability, can monitor all aspects of hardware, program execution state and operating state of the system. In addition, the safety PLC must also be able to perform standard agency ( Such as TUV, FM, etc. ) Certification must be fail safe movement and the fail-safe action is based on the principle of particular design, and to meet international safety standards ( Such as IEC61508 and EN954 - 1, etc. ) Defined in the requirements. In addition, the safety PLC may also include guards to protect the content of the warning and rights management, to protect the safety of PLC is not subject to interference from the outside world. Globally, the practice proved that has the safety PLC industries including automotive, machine tools, machinery, shipbuilding and other industries, as well as the process industry in the petrochemical, oil refining, power plants, boiler control and combustion control, such as high voltage application. In addition, it also can be in some remote, unattended, and the application of maintenance is expensive occasions ( For example, large storage tank zone) Arround.
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