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Conversion of Relay based logic solver system by TMR based Safety Instrumented System

机译：基于TMR的安全仪表系统对基于继电器的逻辑求解器系统的转换

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There are widely diverse opinions in industry concerning what is considered a suitable choice for a logic solver. The choices range from hard-wired relays up through safety-certified PLCs. Depending upon what agency, committee, or insurance company provides "sign-off on applicability for service, the codes or standards followed are similarly diverse. While many companies follow NFPA, others follow corporate standards, national or international safety standards or no standard at all. A Safety PLC represents industry's attempt to develop a failsafe microprocessor based system by invoking the requirements of IEC 61508 in its hardware and software design. Introducing PLC hardware in place of conventional electro-mechanical relay based system for plant's logic solver was inline with development of microprocessors/electronics logic solver over ages. The PLC based, Triple Modular Redundant (TMR) logic solver enhances safety, reliability & availability of plant & they're by reducing nuisance trips. In fact today, a safety PLC became automatic choice as logic solver in most industrial application. The Safety Lifecycle provides a framework of considerations for each stage of a SIS from conception to decommissioning. The intent is to force a logical and sequential procession for the project scope. Some of the basic components of the Safety Lifecycle include: Risk Analysis; Consequence Analysis,Layer of Protection Analysis; Safety Integrity Level (SIL) determination, Documentation of Safety Function Requirements; SIS Conceptual Design; SIL verification; Detail Design and System Implementation.The paper describes, typical architecture of relay based logic solver used in one of the exothermic oxidation reactor of the leading Indian petrochemical plants & it's conversion to SIS (Safety Instrumented System) Logic solver/ Safety Trips Interlock system with risk analysis that the system meets the required level of risk reduction commensurate with the corporate risk tolerance level. It is also describing advantages of using SIS system, advanced diagnostic features, reliability, availability of plant & they're by reducing nuisance trips. It also describes the problems faced during it's implementation & methodology followed for it's seamless trouble free transfer of logic solver.
机译：在业界，关于什么是逻辑求解器的合适选择，存在着各种各样的意见。选择范围从硬接线继电器到经过安全认证的PLC。取决于哪个机构，委员会或保险公司提供“服务适用性的签字，所遵循的准则或标准也类似地有所不同。虽然许多公司遵循NFPA，但其他公司遵循公司标准，国家或国际安全标准或根本没有标准” 。安全PLC代表了业界通过在硬件和软件设计中引用IEC 61508的要求来开发基于故障安全微处理器的系统的尝试，采用PLC硬件代替用于工厂逻辑求解器的常规基于机电继电器的系统符合了以下方面的发展。微处理器/电子逻辑解算器的历史悠久，基于PLC的三重模块冗余（TMR）逻辑解算器通过减少麻烦的行程来提高工厂的安全性，可靠性和可用性，事实上，今天，安全PLC已成为自动选择逻辑解算器在大多数工业应用中，安全生命周期为SIS的每个阶段提供了一个考虑框架从构思到退役。目的是对项目范围进行逻辑和顺序的处理。安全生命周期的一些基本组成部分包括：风险分析；后果分析，保护层分析；确定安全完整性等级（SIL），安全功能要求文件； SIS概念设计； SIL验证；详细设计和系统实现。本文描述了基于继电器的逻辑求解器的典型体系结构，该逻辑求解器用于印度主要石化工厂的放热氧化反应器之一，并已转换为具有风险的SIS（安全仪表系统）逻辑求解器/安全行程互锁系统分析表明系统符合与公司风险承受能力要求相称的风险降低水平。它还描述了使用SIS系统的优势，先进的诊断功能，可靠性，工厂的可用性以及它们通过减少不必要的事故而减少的麻烦。它还描述了在实现和方法论过程中面临的问题，这些问题是逻辑求解器的无缝无故障转移所遵循的。

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