Process Engineering Division – Instrumentation and Automation Section – Daily Question – Question dated 2020-10-28
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Process Engineering Division – Instrumentation and Automation Section – Daily Question – Question from 2020-10-28: Discussion question: 279. Continuing from yesterday’s question, if you had the authority to make a choice, which type of structure would you select? (Briefly explain your reasons for extra points): Dual redundancy diagnostic system in a SIS system, triple redundancy voting system, or the quadruple redundancy diagnostic system developed from the dual redundancy diagnostic system
First of all, while meeting the requirements of the SIL level, I choose the option with the lowest price; if the triple-redundancy version has a reasonable price, then that’s the one I’ll go for.
I choose a triple-voting structure as it offers better value for money
A triple-voting system offers good cost-performance. It includes three independent PLCs along with diagnostic programs that operate within each individual system; through a three-to-two voting mechanism, the system provides users with high reliability and error-free operation. Since the system’s hardware features a physically decoupled design and separate circuit protection, users generally need not worry about hardware failures affecting operation. The triple-voting system adopts advanced system design concepts, and it stands out in industrial field control, especially in PLC control.
Select according to the SIL level requirements: if it is level 1, choose a dual-system diagnostic system； If it is level 2, select a triple-redundancy voting system ； If it is level 3 or above, select a quad-redundant diagnostic system.
If the system does not have high security requirements for SIS, choose a dual-diagnosis system.
A triple-voting system offers good cost-performance. It includes three independent PLCs along with diagnostic programs that operate within each individual system; through a three-to-two voting mechanism, the system provides users with high reliability and error-free operation. Since the system’s hardware features a physically decoupled design and separate circuit protection, users generally need not worry about hardware failures affecting operation. The triple-voting system adopts advanced system design concepts, and it stands out in industrial field control, especially in PLC control
A triple-voting system offers good cost-performance. It includes three independent PLCs along with diagnostic programs that operate within each individual system; through a three-to-two voting mechanism, the system provides users with high reliability and error-free operation. Since the system’s hardware features a physically decoupled design and separate circuit protection, users generally need not worry about hardware failures affecting operation.
A triple-voting system offers good cost-performance. It includes three independent PLCs along with diagnostic programs that operate within each individual system; through a three-to-two voting mechanism, the system provides users with high reliability and error-free operation. Since the system’s hardware features a physically decoupled design and separate circuit protection, users generally need not worry about hardware failures affecting operation. The triple-voting system adopts advanced system design concepts, and it stands out in industrial field control, especially in PLC control
A triple-voting system offers good cost-performance. It includes three independent PLCs along with diagnostic programs that operate within each individual system; through a three-to-two voting mechanism, the system provides users with high reliability and error-free operation. Since the system’s hardware features a physically decoupled design and separate circuit protection, users generally need not worry about hardware failures affecting operation. The triple-voting system adopts advanced system design concepts, and it stands out in industrial field control, especially in PLC control.