Some redundancy
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I would like to ask the experts in this field: how does point redundancy work in the Tricon system? Is there any difference between it and HIM’s card redundancy? What is Tricon’s card module? How many aspects are there in managing the cards of a tricon? I would appreciate some guidance from those who are more experienced! Thank you!
I remember that the TRICON card components seem to be calculated through OVD voting
Well, you’re right; his numerical values are indeed processed through two rounds of voting and one feedback diagnosis. He also has the characteristic of being slightly redundant.
Each channel within a single TRICON card features triple redundancy, whereas HIMA requires two cards to achieve channel redundancy. There are many TRICON cards available: IO cards, communication cards, and MP cards. The number of IO channels depends on the specific model; generally, AI/DI/DO cards have 32 channels, while PI/AO cards have 8 channels.
The Tricon controller was designed from the outset with self-diagnostics as a key feature. Its Triple-Modular Redundant (TMR) architecture (shown in Figure 9) ensures fault tolerance, enabling error-free and uninterrupted operation even in the event of hardware failures or transient faults originating from internal or external sources. Each I/O module contains the circuitry for three independent channels; each channel on the input modules reads process data and forwards it to its corresponding main processor. The three Main Processor (MP) modules communicate with one another through a proprietary, high-speed bus system known as TriBus. Comprehensive diagnostics for each channel, module, and functional circuit allow for the rapid detection and reporting of operational faults via indicators or alarms. This fault information is available to the application software. It is crucial that the application manages this fault information properly to prevent unnecessary shutdowns of processes or plants. This section discusses the methods for handling faults effectively.