AAI841-H00/K4A00 Analog I/O Module | Yokogawa 8-in/8-out 4-20mA HART

Product Overview

AAI841-H00/K4A00 is a non-isolated analog I/O module from Yokogawa. It provides 8 inputs and 8 outputs for 4..20 mA signals. This module supports HART communication and dual-redundant configuration. It offers high accuracy with ±16 µA input and ±48 µA output. The module suits distributed control systems (DCS) and industrial automation.

Key Features

• 8 inputs + 8 outputs (non-isolated)
• Signal: 4..20 mA (input and output)
• HART communication available (-H suffix)
• Dual-redundant configuration ready
• Input accuracy: ±16 µA
• Output accuracy: ±48 µA
• Fast update: 10 ms data refresh
• 2-wire/4-wire selectable per channel

Technical Specifications (Hierarchical)

• General
  • Brand: Yokogawa
  • Model: AAI841-H00/K4A00
  • Series: AAI841 Analog I/O Module
  • Type: Non-isolated I/O Module
• I/O Channels
  • Input: 8 channels (4..20 mA)
  • Output: 8 channels (4..20 mA)
• Input Specifications
  • Signal range: 4..20 mA
  • Max input current: 25 mA
  • Input resistance (power ON): 400 Ω at 20 mA, 1000 Ω at 4 mA
  • Input resistance (power OFF): ≥500 kΩ
  • Accuracy: ±16 µA
  • Step response time: 100 ms
• Output Specifications
  • Signal range: 4..20 mA
  • Load resistance: 0..750 Ω
  • Accuracy: ±48 µA
  • Step response time: 40 ms
  • Circuit-open detection: <0.65 mA
• Transmitter Power Supply
  • At 20 mA: ≥14.8 V
  • At 0 mA: ≤26.4 V
  • 2-wire/4-wire setting: per channel via pin
• Performance & Environment
  • Data update period: 10 ms
  • Temperature drift: ±0.1 % / 10 °C
  • Current consumption: 310 mA (5 V DC), 500 mA (24 V DC)
  • Weight: 0.3 kg
• Connections & Options
  • External connection: Pressure clamp, KS cable, MIL connector
  • Option /K4A00: KS Cable Interface Adapter (ATK4A-00)
  • Suffix -H: HART protocol support

Expert Review

“AAI841-H00/K4A00 offers reliable 4..20 mA analog I/O for Yokogawa DCS. The 100 ms input response and 10 ms update rate suit fast control loops. HART communication adds diagnostic value. We recommend it for continuous process monitoring and control.”

Manager’s Insight

“This module simplifies analog loop management with 8 inputs and 8 outputs in one unit. The per-channel 2/4-wire setting gives flexibility. The KS cable adapter option eases wiring. With 12-month warranty and global support, it is a solid investment.”

Applications & Compatible Devices

• Systems: Yokogawa CENTUM VP, ProSafe-RS, STARDOM
• Sensors: Pressure, temperature (4..20 mA transmitters)
• Actuators: Positioners, I/P converters, control valves
• Industries: Oil & gas, chemical, power, water treatment
• Use cases: PID control, data acquisition, HART asset management

Installation & Maintenance

• Mounting: Directly on Yokogawa DCS backplane
• Wiring: Use shielded twisted-pair cables for 4..20 mA signals
• Terminals: Pressure clamp, KS cable, or MIL connector
• Configuration: Set 2-wire/4-wire transmitter per channel using pins
• Redundancy: Dual-redundant configuration supports hot standby
• Maintenance: Module replacement without powering down (if redundant)

Frequently Asked Questions

• Q: What is the difference between -H and non-H versions?
  -H adds HART communication protocol for digital diagnostics and configuration.
• Q: Can I use this module with 2-wire transmitters?
  Yes. Set the channel pin to 2-wire mode. The module supplies loop power.
• Q: What is the maximum cable length for 4..20 mA?
  Up to 200 m with shielded cable, depending on loop resistance.
• Q: How do I detect an open circuit on the output?
  The module detects current below 0.65 mA as a circuit-open condition.
• Q: Is the module hot-swappable?
  Yes, in dual-redundant configurations. For single modules, power down before removal.

Experience-based Q&A

• Q: The input reading fluctuates. What should I check?
  Check the transmitter power supply and cable shielding. Also verify the ground connection.
• Q: Can I connect a 4-wire transmitter to the input?
  Yes. Set the channel to 4-wire mode and connect the external power separately.
• Q: The output does not reach 20 mA. What is wrong?
  Check the load resistance (must be ≤750 Ω). Also verify the DCS output command.

Selection Guide

• For HART communication, choose AAI841-H (with -H suffix).
• For KS cable interface, add option /K4A00 (includes ATK4A-00 adapter).
• For explosion-proof environments, consult Yokogawa documentation for safety barriers.
• For redundant applications, order two modules and configure as dual-redundant.
• For high-density applications, this 8-in/8-out design saves cabinet space.

Comparison with Similar Models

• AAI835-H – Isolated analog I/O, 8 in / 8 out, higher isolation.
• AAI141-H – 4 input channels (less density).
• AAI543-H – 4 output channels (less density).

Package Contents

• AAI841-H00/K4A00 analog I/O module (1 unit)
• KS Cable Interface Adapter (ATK4A-00) – included with /K4A00 option
• User manual (English)
• Warranty card (12 months)

Shipping & Delivery

• Dispatch: 12–24 hours after order
• Carriers: FedEx, UPS, DHL (express worldwide)
• Tracking: Provided within 24 hours

Contact Information

For inquiries, contact our sales team:

• Email: sales@powergearx.com
• WhatsApp: +86 18030005825

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