Analog Input Modules
An analog input (AI) module includes three independent input channels. Each input channel receives variable
voltage signals from each point, converts them to digital values, and transmits the values to the three main
processor modules on demand. In TMR mode, one value is then selected using a midvalue
selection algorithm to ensure correct data for every scan. Sensing of each input point is performed in a manner that
prevents a single failure on one channel from affecting another channel. Each analog input module sustains
complete, ongoing diagnostics for each channel.
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