AAI841-H50 | Yokogawa | Non-Isolated Analog I/O Module (8-Input/8-Output)

Technical Overview

The AAI841-H50 is a high-performance analog mixing module designed for the Yokogawa CENTUM VP integrated control system. This module provides a compact footprint for process automation by integrating 8 input channels and 8 output channels into a single unit. It is engineered for high-speed data acquisition with a 10 ms update cycle, making it ideal for dynamic control loops where latency must be minimized.

As a non-isolated module, the AAI841-H50 shares a common ground, which optimizes space and cost for environments where external signal isolation is already managed or not required. The built-in transmitter power supply ensures that field instruments receive stable voltage even under full load.

Detailed Specifications

• Module Identification: AAI841-H50

• I/O Configuration: 8-channel current input / 8-channel current output

• Isolation: Non-isolated (Common ground)

• Signal Range: 4 to 20 mA DC

• Input Accuracy: ±16 µA (High-precision sensing)

• Data Refresh Rate: 10 ms

• Input Impedance: 250 Ω

• Maximum Input Current: 25 mA

• Transmitter Power Supply: 14.8 V DC (at 20 mA) to 26.4 V DC (at 0 mA)

• Output Allowable Load Resistance: 0 to 600 Ω

• External Interface Options: Pressure clamp terminals, KS cable, or MIL connector cable

• Power Consumption: Max 450 mA (5 V DC)

• Physical Weight: Approximately 1.3 kg

Module Connectivity and Integration

The AAI841-H50 supports multiple wiring methodologies to suit various cabinet architectures. For rapid deployment, the MIL connector or KS cable interface allows for "plug-and-play" integration with terminal boards. For traditional point-to-point field wiring, the pressure clamp terminal provides a secure, vibration-resistant connection.

Frequently Asked Questions

• Can this module power 2-wire transmitters?

  Yes, it includes an integrated power supply that delivers at least 14.8 V at a full 20 mA load.

• What is the impact of it being non-isolated?

  Non-isolated modules require a shared reference potential. If your field signals have significant ground loops or voltage offsets, an external signal isolator or an isolated Yokogawa module variant should be used.

• Does the 10 ms update period apply to both I and O?

  Yes, the high-speed data update period is synchronized across the input and output processing cycles of the module.