Live essential security

Live bus system in the explosive area

Various on -site bus systems are used in different industrial fields. This is because each department has special requirements, not every system can be met. The essential security concept (abbreviated as FISCO) exists in areas with high explosive risks, namely the field of chemistry or physics.

This concept should ensure that nothing happens in these very dangerous industrial sectors. If there is a unified system, some security vulnerabilities may not be recognized, and it may not be able to ensure the safety standards implemented by each industry. This is different from the essential safety concept. This concept meets the DIN standard: DIN EN 60079-27 (VDE 0170-27): 2008-12, so it was officially recognized.

History of the concept of the essential security on the spot

was developed by different political parties in the mid -1990s. On the one hand, the German Federal Physical Technology Company participated in the development, and on the other hand, ABB and the chemical industry also participated in development. In addition, the Profibus organization used for technical support has always been part of the concept of field essential security. Over the years, this concept has changed again and again. Since 2001, the on -site bus foundation has also become part of the development team.

FISCO system application advantage

When using the essential safety concept of the field in high explosive areas, the system provides users with certain advantages. One of the most important items is that plug -in and played solutions can be used for dangerous situations or regions, so it can be taken very easily and quickly. In addition, the concept does not require any system certification at all, so the work is progressing faster. The installation and settings of most alternative systems are complicated.

The essential safety concept of the scene is the simple expansion of the system and can be used quickly and easily. maximum. The number of devices that can be connected is very large, which greatly reduces the cost. This is very important in industry and science because the budget is very limited in most cases. The last advantage of the essential safety concept is that new calculations are not needed when replacing the device. This is a very heavy work that requires time and money.

Requirements about this system

FISCO systems have several standards that must be met. The devices used have been certified by FISCO, which means that they need typical CE test certificates. When this type of certificate is needed, one of the following institutions should be contacted:

● PTB
● BVS
● Kayma
● FM
● CSA

These institutions can certify the device based on FISCO, and only in this way can they really use it with the essential security concepts on the spot. In all other circumstances, because compatibility has not been checked and certified by professional experts, the system cannot be guaranteed to ensure the high security of the system. UI, II, and PI are suitable for each on -site device to use this concept operation. U0 is less than UI than I0 less than Pi. Only by meeting these standards can the system's function be guaranteed.

also must also meet the required cable parameters. This means that R, L, and C must be the same as type A cable type A. Another requirement for the concept of the essential safety of the scene is that the line connection must be correct. If this is not the case, it is no longer guaranteed to be safe and the system cannot run as expected.

Profibus or Foundation's total length (including short -cut lines) of the H1 line H1 line is the largest, which is important. 1000 meters. There are exceptions, but they are only applicable to multiple obstacles. maximum. Profibus Pa or Foundation's live bus H1 line (including short -term) can reach 1900 m. Strict attention should not be taken than the length of these regulations. In this way, the system runs as expected and does not endanger the safety in the industrial process.

Make sure essential security

In order to ensure the safety of each on -site bus component, multiple measures must be adopted to adopt the concept of field essential security. For example, only one energy supply per element is essential. The cable length and cable type should also be accurately specified.

In addition, when the station is being transmitted, the concept of essential security at the scene can only work when there is no energy feedback into the network.

Finally, pay attention to the minimum current of each terminal unit. Unless each terminal unit has a specified consumption value, it cannot guarantee the essential safety of the on -site bus component.