Yokogawa AAI841-S50/K4A00 Analog I/O Module

Overview

The Yokogawa AAI841-S50/K4A00 is an Analog Input/Output (I/O) module for Yokogawa’s CENTUM series Distributed Control Systems (DCS), including CENTUM VP. It connects with field instruments and converts analog signals for process control and monitoring. The module supports both input and output channels with 4–20 mA signals. It features non-isolated channels designed for reliable operation in industrial environments.

Technical Specifications

Model: AAI841-S50/K4A00

• Input Channels: 8 (4–20 mA, non-isolated)

• Output Channels: 8 (4–20 mA, non-isolated)

• Input Resistance:

• Power ON: 290–450 Ω (depends on current)

• Power OFF: ≥ 500 kΩ

• Allowable Input Current: Up to 25 mA

• Allowable Load Resistance (Output): 0 to 750 Ω

• Circuit-Open Detection Threshold: < 0.65 mA

• Accuracy:

• Input: ±16 µA

• Output: ±48 µA

• Data Update Period: 10 ms

• Temperature Drift: ±16 µA per 10°C

• Withstand Voltage: 500 V AC for 1 minute between I/O and system

• Power Supply:

• 5 V DC: Max 230 mA

• 24 V DC: Max 540 mA

• External Connections: KS cable interface adapter (ATK4A-00)

• Mounting: DIN rail or panel mount

• Operating Temperature: –20°C to +60°C

• Weight: 0.3 kg

• HART Communication: Not supported on this variant