The ‌ABB DSDI306 57160001-CM‌ is a high-precision pulse counting and frequency measurement module designed for ABB’s Symphony® Plus DCS platform. As part of the S+ I/O HI400 series, this 6-channel device achieves 0.001% frequency measurement accuracy at 100kHz input signals, making it essential for turbine overspeed protection in 1300MW nuclear power plants. The ‌DSDI306 57160001-CM‌ supports quadrature encoder inputs with 32-bit counters, enabling precise position tracking for rolling mill drive systems in steel production.