Emergency Shutdown Device£¨ESD£©
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The Emergency Shutdown Device£¨ESD£© is a redundant fault-tolerant controller based
 on a Tricon TMR (triple modular redundancy) architecture. The system has three main processors. All I/O signals are triplicated and processed by a two-out-of-three voting scheme of the hardware to ensure redundant fault-tolerance of the system. Every main processor contains a 32-bit CPU running under a 3-2-1-0 mode. With a maximum processing capacity of more than 4,000 I / O points, the system can be applied to emergency shutdown devices of all sizes.
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The ESD boasts the following advantages:
l The main processors and I/O modules are fully triplicated.
l No system shutdown will be caused by a single point of failure.
l Optical isolators on I / O modules are all triplicated.
l All analog modules including AI, AO and PI are of high precision and can be automatically checked regularly.
l With its TUV AK-6 certification, the system meets the SIL 3 (Safety Integrity Level) requirements.
l 32-bit chips ensure the rapid operation of the system.
l The system’s built-in diagnosis functions cover a wide range of system faults. There is no need to compile application programs.
l The system provides very convenient system maintenance and troubleshooting
l The main processor modules and I / O modules can all be replaced online.
l Its application software can be modified or downloaded on-line, and has passed TUV AK-6 certification.
l The software is user-friendly with offline simulation testing provided.
l The millisecond SOE (Sequence of Events) feature is a great help for users in fault and event analyses.
l Its scale flexibility greatly facilitates the expansion of the system and effectively reduces the expansion cost.
l All modules come with metal keylocks to prevent wrong insertion.
l The remote I / O has a maximum link distance of 12 KM.
l It provides strong communications, supports standard MODBUS, PC network and OPC protocols and allows for seamless links to such dedicated DCS control networks as HONEYWELL and FOXBRO. |
