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The Allen-Bradley 1771-VHSC is a versatile high-speed counter module designed for precise pulse counting and frequency measurement applications, ideal for motion control and totalizer setups. Featuring four configurable input channels, the module supports multiple modes ‚ rate, encoder, counter, and period/rate ‚ with input frequencies up to 1MHz in single-channel mode, and includes block transfer programming capabilities. Equipped with 12 digital inputs, 8 isolated digital outputs, and compatibility with encoders and pulse generators, it operates efficiently with a 100-microsecond update period and provides robust integration with a variety of high-speed sensors, making it suitable for demanding industrial automation environments.