The Yokogawa NFAP135-S00 S2 is a high-speed, 8-channel isolated Pulse Input Module designed for CENTUM series DCS. It features a 10 kHz frequency range, 2 ms refresh rate, and selectable pull-up voltages, providing precise signal acquisition for flow meters, encoders, and turbine sensors.
The Yokogawa NFAP135-S00 S2 serves as a high-speed interface for capturing and processing pulse signals within the CENTUM VP and STARDOM architectures. This module actively monitors eight independent, isolated channels, allowing it to translate frequency data from field devices into actionable control logic. Because the unit supports an extensive input frequency range of 0 to 10 kHz, it can accurately track rapid process changes. Furthermore, the module detects pulses as narrow as 40 μs, which ensures that the system never misses critical data points during high-velocity operations such as turbine speed monitoring or high-speed counting.
To maintain data integrity in electrically noisy environments, the NFAP135-S00 S2 incorporates sophisticated signal conditioning features. The module actively utilizes a configurable filter function to eliminate signal chattering, which often plagues mechanical switches and rotary encoders. Additionally, operators can select from multiple shunt resistance levels (OFF/200/500/1000 Ω) and dual pull-up voltage settings (12V/24V DC). These adjustable parameters allow the module to adapt seamlessly to various sensor types, including open-collector outputs and voltage pulses, while the 68 kΩ pull-up resistance ensures stable signal levels even over long cable runs.
The NFAP135-S00 S2 prioritizes speed by delivering a rapid 2 ms data refresh cycle, providing the Distributed Control System (DCS) with near-instantaneous process updates. This high-speed capability is particularly beneficial for flow measurement and motion control where timing is critical. Moreover, the module provides a selectable transmitter power supply, which actively powers field sensors directly from the rack. This integrated power approach simplifies wiring and reduces the need for external power distribution components within the control cabinet.
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