ABB IMDSM04BAILEY CONTROLSMODULE

Multiplexer and Input State Circuitry

The eight conditioned input signals from the Schmitt-trigger inverters are time-division multiplexed to use a single 16-bit counter. A channel counter increments the multiplexer. Each channel processes in turn every 7.2 microseconds (every 7.8 microseconds if a slave expander bus transaction takes place). The channel counter spends about 900 nanoseconds processing each input before moving onto the next channel. When the multiplexer selects a channel, an 8-bit shift register stores the input state (0 or 1). The register shifts for each channel sample. The 8-bit register will hold the previous input state for each complete count. The MFP may read the present input state.

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