The ABB DP840 is a high-performance, 8-channel pulse counter module designed for the S800 I/O system, a comprehensive, distributed, and modular process I/O system that communicates with parent controllers over industry-standard field buses. This module is engineered for demanding applications requiring precise counting of high-frequency pulse signals from field equipment such as flow meters, encoders, and tachometers. Each channel is individually configurable for pulse counting, frequency measurement, or time measurement, offering exceptional flexibility. With individual galvanic isolation per channel, the DP840 ensures signal integrity and robust performance in harsh industrial environments, making it a reliable component for process control and data acquisition in ABB’s System 800xA.