光电隔离元件应用于安全仪表系统数字量输出的方法和分析

Application and Analysis of Optoelectronic Isolated Components in Digital Output of Safety Instrumented System

安全仪表系统的数字量输出,需要采用隔离措施,防止现场干扰影响系统内部电路。光电隔离元件,是一种采用光电转换的方式,削弱瞬间高电压或大电流的影响。对输出的元件进行周期性的自诊断,也是安全仪表系统的一个特点。光电隔离的材质和诊断方式,对系统的输出特性和电路布线有很大影响。

The digital output of the safety instrument system needs to adopt the isolation measure, prevent the scene interference to influence the internal circuit of the system. Photoelectric isolation components, is a way of using photoelectric conversion, weakening the impact of instant high voltage or high current. Output components periodic self-diagnosis is a feature of safety instrumentation system. Optically isolated materials and diagnostic methods, have a great impact to the system＇s output characteristics and circuit wiring.