高诊断覆盖率开关量输入模块设计  

Design of Digital Input Module with High Diagnostic Coverage

作　　者：李军 Li Jun(Microcyber Corporation,Liaoning Shenyang,110179)

机构地区：[1]沈阳中科博微科技股份有限公司,辽宁沈阳110179

出　　处：《中国仪器仪表》2021年第6期41-44,共4页China Instrumentation

摘　　要：高诊断覆盖率开关量输入模块是安全PLC系统的一个组成部分。传统具有SIL3安全等级的开关量输入模块均采用的1oo2D或2oo3D架构中的一种,这两种架构设计复杂度高,开发难度大,导致产品成本居高不下,阻碍了功能安全产品的进一步推广应用。介绍了一种采用1oo2D+1oo1D混合架构,采用单处理器实现了SIL3安全等级,提高了可靠性、降低了开发成本。其中MCU采用1oo1D架构,输入通道部分采用1oo2D架构,诊断覆盖率可以达到99%以上。Digital input module with high diagnostic coverage is an integral part of safety PLC system. Traditional switch input modules with SIL3 security level all adopt one of 1oo2D or 2oo3D architectures. These two architectures are highly complex in design and difficult to develop, resulting in high product cost and hindering the further promotion and application of functional security products. This paper introduces a hybrid architecture using 1oo2D+1oo1D, which uses a single processor to achieve SIL3 security level, improves reliability and reduces development cost. The MCU adopts 1oo1D architecture and the input channel adopts 1oo2D architecture.diagnostic coverage can reach more than 99 percent.

关 键 词：功能安全 开关量输入 高诊断 混合架构 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]