The ABB DP820 is a robust, single-channel pulse counter module designed for the S800 I/O system. It is engineered to accurately count pulses from various field devices, such as flow meters and shaft encoders, making it an essential component for precise measurement and control in industrial automation applications. The DP820 is galvanically isolated from the ModuleBus and other channels, ensuring signal integrity and system reliability. It connects seamlessly to the process control system via a ModuleBus on a baseplate, providing high-frequency counting capabilities and reliable performance in demanding environments.