YOKOGAWA · FIO ANALOG I/O AAV141-S50/K4A00 Analog Input Module Analog input module for Yokogawa FIO architectures, designed for differential voltage signal acquisition in the field control system. 16-Channel AI 1–5 V DC Non-Isolated Differential Input ATK4A-00 Product Position Voltage-input FIO module AAV141 is documented by Yokogawa as an analog input module for FIO systems. It is used to acquire field-side analog voltage signals and provide the resulting input data to the