Yokogawa AAI841-H50 Analog I/O Module with HART

Product Summary

The Yokogawa AAI841-H50 is a HART-Compatible Analog Input/Output Module for the Yokogawa CENTUM VP / CS 3000 distributed control system (DCS). It provides 8 non-isolated 4-20mA analog input channels and 8 non-isolated 4-20mA analog output channels in a single module, with integrated HART digital communication for smart transmitter configuration and diagnostics. The -H50 configuration includes the HART-enabled module with the ATK4A-00 KS cable interface adapter.

Core Specifications

• Model Number: AAI841-H50
• Type: HART Analog Input/Output Module (8 Inputs + 8 Outputs, Non-Isolated)
• Input Channels: 8 non-isolated 4-20mA inputs
• Output Channels: 8 non-isolated 4-20mA outputs
• Input Signal: 4–20 mA DC
• Output Signal: 4–20 mA DC
• Input Impedance: 250 Ω (during active operation)
• Allowable Output Load: 600 Ω maximum
• Allowable Input Current: 25 mA maximum
• Input Accuracy: ±16 µA
• Output Accuracy: ±16 µA
• Resolution: 16-bit (both input and output)
• Data Update Period: 10 ms
• Temperature Drift: ±16 µA/10°C
• Transmitter Power Supply: 14.8 V or higher (at 20 mA); 26.4 V or less (at 0 mA)
• Dimensions (L × W × H): 23.5 × 104 × 110 mm
• Weight: 0.3 kg
• Manufacturer: Yokogawa Electric Corporation

Electrical & Functional Characteristics

• HART Communication: Integrated HART digital communication for smart transmitter configuration, diagnostics, and multivariable data access
• Non-Isolated Channels: All 16 channels share a common return; suitable for grounded or common-reference field devices
• Dual-Redundant Configuration: Can be used in dual-redundant I/O configuration for high-availability applications
• Transmitter Power Supply: Built-in 24V loop power supply for 2-wire input transmitters
• Output Protection: Overcurrent and overvoltage protection on each output channel
• Input Protection: Overcurrent protection up to 25 mA per input channel
• Signal Conditioning: Built-in filtering and linearization for stable process variable readings
• Status Indicators: Module status LEDs for power, communication, and channel health
• Hot Swappable: Supports online replacement without system shutdown (when configured)

System Integration & Compatibility

• Primary Platform: Yokogawa CENTUM VP / CS 3000 DCS
• Mounting: ESB bus node units (ANB10S, ANB10D), Optical ESB bus node units (ANB11S, ANB11D), and field control units (AFV30S, AFV30D, AFV40S, AFV40D, AFV10S, AFV10D)
• Communication: Vnet/IP or Vnet bus connection to FCS controller
• Configuration: Configured via CENTUM VP Engineering Station (EWS)
• External Connection: ATK4A-00 KS cable interface adapter (included with -H50 suffix); KS cable to terminal board; MIL connector cable; pressure clamp terminal
• Compatible Terminal Boards: AEA4D (for selectable 2-wire/4-wire input/output)
• Related Modules:
  • AAI841-H00 — HART type, non-explosion proof, basic type
  • AAI841-H50 — HART type, non-explosion proof, basic type, with ATK4A-00 (this part)
  • AAI841-H53 — HART type, non-explosion proof, with ISA G3 + temperature (-20 to 70°C) option, with ATK4A-00
  • AAI841-S00 — Standard type (non-HART), non-explosion proof, basic type
  • AAI841-S50 — Standard type (non-HART), non-explosion proof, basic type, with ATK4A-00
  • AAI841-S53 — Standard type (non-HART), non-explosion proof, G3 + temp option, with ATK4A-00
  • AAB841 — 1-5V input / 4-20mA output analog I/O module (8-in/8-out, non-isolated)
  • AAI135 — 4-20mA analog input module (8-channel, isolated)
  • AAI143 — 4-20mA analog input module (16-channel, isolated)

Environmental & Operational Limits

• Operating Temperature: 0°C to 50°C (32°F to 122°F) (basic type); -20°C to 70°C with option code 3
• Storage Temperature: -20°C to +70°C (-4°F to 158°F)
• Humidity: 10% to 90% RH, non-condensing
• Vibration: Compliant with IEC 60068-2-6
• Shock: Compliant with IEC 60068-2-27
• Approvals: CE, UL, CSA (depending on region and certification)

Industrial Applications

Widely deployed in oil & gas refining, petrochemical processing, power generation, water/wastewater treatment, pharmaceutical manufacturing, food & beverage, and pulp & paper industries where high-density combined analog input/output with HART smart device communication is required for process control loops, PID control, and asset management.

Frequently Asked Questions

What is the AAI841-H50 used for?

It is an 8-input + 8-output 4-20mA analog I/O module for Yokogawa CENTUM VP / CS 3000 DCS systems, with integrated HART digital communication for smart transmitter configuration, diagnostics, and multivariable data access.

What does the -H50 suffix mean?

-H = HART communication type; 5 = Non-explosion proof; 0 = Basic type; /K4A00 (implied by -50) = With ATK4A-00 KS cable interface adapter included.

What is the difference between AAI841-H50 and AAI841-S50?

The AAI841-H50 includes HART digital communication capability for smart transmitter configuration and diagnostics. The AAI841-S50 is the standard type without HART communication. Both have identical analog I/O specifications.

What is the difference between AAI841-H50 and AAI841-H00?

The AAI841-H50 includes the ATK4A-00 KS cable interface adapter. The AAI841-H00 is the basic module without the adapter.

Are the channels isolated?

No — the AAI841 series uses non-isolated channels. All 16 channels share a common return. For isolated analog I/O, consider the AAI135 (8-channel isolated input) or AAI835 (4-in/4-out isolated) modules.

Can this module support dual-redundant configuration?

Yes — the AAI841 series supports dual-redundant I/O configuration when paired with dual-redundant terminal boards and appropriate system configuration.

What terminal board do I need?

Use AEA4D terminal board for selectable 2-wire/4-wire input/output configuration. The KS cable (model KS1) connects the included ATK4A-00 adapter to the terminal board.

What are the related part numbers?

• AAI841-H00 — HART type, non-explosion proof, basic type
• AAI841-H50 — HART type, non-explosion proof, basic type, with ATK4A-00 (this part)
• AAI841-H53 — HART type, non-explosion proof, G3 + temp option, with ATK4A-00
• AAI841-S00 — Standard type (non-HART), non-explosion proof, basic type
• AAI841-S50 — Standard type (non-HART), non-explosion proof, basic type, with ATK4A-00
• AAI841-S53 — Standard type (non-HART), non-explosion proof, G3 + temp option, with ATK4A-00
• AAB841 — 1-5V input / 4-20mA output analog I/O module (8-in/8-out, non-isolated)
• ATK4A-00 — KS cable interface adapter (included with -H50)
• AEA4D — Terminal board for analog I/O