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The Allen-Bradley 1794-VHSC Flex I/O High-Speed Counter is a versatile and robust I/O module designed for high-speed counting in industrial applications. It features two input channels, each supporting two counters that can be configured for three encoder modes, with input terminations at 5V DC or 15-24V DC. The module offers two isolated outputs with electrical ratings appropriate for a range of applications, and its input frequency reaches up to 1MHz. It requires a 24V DC nominal external power supply, delivers 50V isolation using basic insulation, and is compatible with 1794-TB3G or 1794-TB3GS terminal base units. With dimensions of 3.7in x 3.7in x 2.7in, the 1794-VHSC operates efficiently in temperatures from 0 to 55 °C and can be integrated into systems with EtherNet capabilities, ensuring seamless performance in diverse environments.