What are the components of SIS
Today, I will talk to you about the components of SIS, which may not be well understood by many people. in order to make you understand better, the editor has summarized the following contents for you. I hope you can get something according to this article.
The basic composition of SIS system can be divided into three parts: sensor unit, logic operation unit and final execution unit.
Related introduction:
Safety instrument system, Safety instrumentation System, referred to as SIS;, is also known as Safety interlock system (Safety interlocking System). Mainly for the alarm and interlock part of the factory control system, the alarm action or adjustment or shutdown control is implemented for the results detected in the control system, which is an important part of the automatic control of factories and enterprises.
Characteristics
(1) taking IEC61508 as the basic standard and complying with the safety standards for instruments prescribed by the International Safety Institute.
(2) it has wide coverage, high safety and self-diagnostic function, and can detect and prevent potential hazards.
(3) for fault-tolerant multiple redundancy systems, SIS generally adopts multiple redundancy structure to improve the hardware fault margin of the system, and a single failure will not lead to the loss of SIS security function.
(4) the application program is easy to modify, and the software can be modified according to the actual needs.
(5) the coverage rate of self-diagnosis is large, and the number of points that workers need to check during maintenance is relatively small.
(6) the response speed is fast, the response time from input change to output change is generally about 10-50ms, and the response time of some small SIS is even shorter.
(7) it can realize the safety design of the whole circuit from the sensor to the executive element, and has the monitoring functions such as Ihammer O short circuit, wire break and so on.
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