In recent years, major automakers have made a system as their main selling point –

When the vehicle is driving, this system can remind the driver to brake in time and even take the initiative to take emergency braking to ensure driving safety when it detects an obstacle ahead or is too close to the vehicle in front. And this is our very common car “active braking system”.

With the continuous development of society, “safety is no small matter” has become the basic principle of all walks of life. This is true for the automotive industry, and for industries such as petrochemicals, coal chemicals, and natural gas that are continuously produced and have certain “high-risk attributes” Not to be underestimated.

Then the question arises. Cars can use the “active braking system” to reduce potential safety hazards. For the above-mentioned heavy industries, is there a similar system that can detect dangers in a timely and accurate manner? Can you step on the brakes?

Alarm bells are ringing, industrial production needs a safety gate

Anyone who has watched the movie “Heroes of Fire” knows that the oil industry is very dangerous, and it is also related to refining, chemical, coal gas and other industries, which are called process industries.

Let’s look at another set of data. Using “safety production accident” as the key word, there are 100 million related results in the search engine; and using “chemical plant” and “accident” as the key word, the number of related results is as high as 40 million.

It can be seen that in industrial scenarios, security issues have received as much attention as “hot searches for eating melons”. According to statistics, in 2020, the number of deaths in production safety accidents nationwide will be more than 27,400. Although it has dropped significantly compared with previous years, the economic losses and harm to families and society behind this number are still complex and severe.

Under this premise, for industrial production enterprises that maintain a large number of hydraulic, high-temperature boilers, chemical production and other equipment, they need a safety door – Safety Instrumented Systems (SIS).

What is SIS?

SIS is Safety Instrumented System, which is named after the American Instrument Society (ISA) definition of Safety System Control System, also known as Emergency Shutdown System (ESD), Safety Interlock System (SIS) or Instrument Protection System (IPS) Wait.

For most of my friends, SIS should be a relatively unfamiliar concept, but we can imagine it as the car active braking system mentioned above, but SIS is mostly used in industrial scenarios.

It can monitor the temperature, pressure, flow, liquid level and other information in the production process through sensors. If the index exceeds the standard or the equipment fails, the SIS safety instrumented system can automatically or manually complete pre-set safety actions when necessary. , to protect the safety of operators and equipment.

Through the above introduction, it can be seen that SIS, which can provide continuous safety interlock protection, is a very important “safety door” in a large number of industrial fields such as nuclear power plants, oil refining, petrochemicals, and chemicals.

Step on the brakes, the three abilities that SIS must have

It is worth noting that in the process of understanding the car’s “active braking system”, it is not difficult to find some problems in the system itself: the response is too sensitive, resulting in abnormal braking, inaccurate information feedback, and so on.

In the industrial production process, if the SIS that has been in the “silent operation in the background” for a long time often has such “small movements”, it may cause shutdowns and even more serious losses. Therefore, this requires SIS to have several key capabilities. Next, let’s take the latest safety instrumented system Tricon CX of the Triconex brand under Schneider Electric as an example, and expand it——

Vote No: Trusted Fault Tolerance

The production process is complex, closed and changeable, and false alarms are prone to occur. Therefore, the industry will adopt a structure similar to the “multi-party supervision, majority vote” structure to make judgments.

Take Tricon CX as an example, it adopts the classic triple redundant TMR (Triple Modular Redundant) structure design. To put it simply: 3 sensors will be provided for the equipment and facilities. When one of them alarms and the other two do not respond, the system will determine that this “vote” is invalid. This is similar to our common majority vote voting system, which can effectively reduce downtime caused by false information.

Hard core strength: powerful detection capabilities

To a certain extent, SIS is like the armor of a soldier. It does not actively produce attacks, but when the fighter is injured, it can immediately play a protective role. But unlike the armor, the SIS also needs to detect whether there is a fault in itself when it is not in action, and determine whether the final action can be performed correctly. To achieve this kind of “outside inspection” and “introspection” all the time, it needs to have a strong detection ability.

In addition to “big and complete”, the processing speed must also be “fast and strong”, Tricon CX controller adopts advanced high-speed industrial chips and bus transmission up to 1GB. At the same time, Tricon CX supports 1 ms SOE resolution, loop supervision function, integrated HART function, etc. These modules are like cell phone chips that provide powerful power for the operation of the SIS system.

·Guarding the bottom line: continuously improving security capabilities

Safety is the bottom line of SIS’s existence. However, from another perspective, SIS not only needs to ensure the security of the production process, but in today’s digital age, the information security of SIS is equally important.

Just like judging whether food is safe or not, you can check whether it has obtained the relevant food certification level, whether SIS is safe or not actually has relevant certification. Tricon CX has obtained SIL-3 functional safety certification and SL1 information security certification, both of which are close to the “industry standard ceiling” in the industry.

In addition, it is worth mentioning that Tricon CX belongs to the Triconex family and uses the same software as other Triconex systems to form an integration of software and hardware. At the same time, a comprehensive digital security solution has been established based on Schneider Electric EcoStruxureTM. Truly “safe, Tricon CX is serious”.

The working medium is flammable and explosive, the equipment is large-scale, and the process is complicated. These are the characteristics of the process industry. Through relevant accident cases at home and abroad, we can all see that if an accident occurs, it will bring incalculable seriousness. as a result of. In addition, industries such as electric power, rail transit, and nuclear industry also face the same safety issues.

In this case, Schneider Electric Triconex system, as a typical representative and main force in the SIS industry, can add a solid safety door to industrial production and become an indispensable guarantee.

To get the latest Tricon CX product introduction, you can move to the “Schneider Electric” official account, follow and reply to “SIS”.

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