Yokogawa AAI835-H50/K4A00 Analog I/O Module

Overview

The Yokogawa AAI835-H50/K4A00 is a 4-channel analog input/output module designed for use in CENTUM VP and CS 3000 distributed control systems. It supports 4–20 mA current signals for both input and output. Each channel is isolated to ensure high accuracy and noise immunity. The H50 suffix adds HART communication support, while the K4A00 option includes a KS cable interface adapter for simplified connection to terminal boards like AEA4D.

Technical Specifications

Model: AAI835-H50/K4A00
Product Type: Analog I/O Module (Current I/O)

I/O Configuration

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

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

• Input Signal: 4–20 mA

• Output Signal: 4–20 mA

• Allowable Input Current: Up to 25 mA

Communication Features

• HART Communication: Supported

Electrical Characteristics

• Input Resistance (Power ON): 290–450 Ω (varies with current)

• Input Resistance (Power OFF): ≥500 kΩ

• Withstand Voltage (I/O to system): 500 V AC for 1 minute

• Withstand Voltage (channel to channel): 500 V AC for 1 minute

Accuracy

• Input Accuracy: ±16 µA

• Output Accuracy: ±48 µA

Power and Mounting

• Power Supply: 5 V DC and 24 V DC (via base module)

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

• Mounting Options: DIN rail or panel mount

Environmental Conditions

• Operating Temperature: –20°C to +70°C

• Weight: 0.2 kg

Suffix and Option Codes Summary

• AAI835: Model – Analog I/O Module (4–20 mA, 4-channel input/output, isolated channels)

• H50: HART support, no explosion protection, basic type

• K4A00: KS Cable Interface Adapter (Model: ATK4A-00)