TRICONEX 3703E Isolated Analog Input Module

Product Discription

As each input module is polled, the new input data is transmitted to the main processor over the appropriate channel of the I/O bus. The input data from each input module is assembled into a table in the main processor and stored in memory for use in the hardware voting process. The individual input table in each main processor is transferred to its neighboring main processors over the proprietary TriBus. During this transfer, hardware voting takes place. The TriBus uses a direct memory access (DMA) programmable device to synchronize, transmit, vote and compare data among the three main processors. 

If a disagreement is discovered, the signal value found in two out of three tables prevails, and the third table is corrected accordingly. One-time differences which result from sample timing variations can be distinguished from a pattern of differing data. The three independent main processors each maintain data about necessary corrections in local memory. Any disparity is flagged and used at the end of the scan by the built-in Fault Analyzer routines to determine whether a fault exists on a particular module.

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