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AAB841-S50 Yokogawa Analog I/O Module

AAB841-S50 Yokogawa Analog I/O Module

Product Description

The AAB841-S50 (AAB841) is a high-performance combined analog input/output module for the Yokogawa Electric Corporation CENTUM VP distributed control system. This dual-function module provides 8 channels of differential voltage input and 8 channels of current...

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SKU: AAB841-S50
Vendor: Yokogawa
Category: Analog I/O Module
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Product Description

The AAB841-S50 (AAB841) is a high-performance combined analog input/output module for the Yokogawa Electric Corporation CENTUM VP distributed control system. This dual-function module provides 8 channels of differential voltage input and 8 channels of current output in a single footprint, making it ideal for compact control loops and HART-enabled field instrument integration.

The module supports bidirectional digital overlay on analog signals, enabling remote configuration, calibration, and diagnostics for HART-enabled transmitters and valve positioners. Its differential input architecture is optimized for 1–5 V DC signals with high impedance to maintain signal integrity. With a rapid 10 ms data update cycle, it is suitable for dynamic process control applications requiring fast, accurate responses.

Detailed Technical Specifications

Parameter Specification
I/O Configuration 8-Channel Input / 8-Channel Output
Input Signal Type 1–5 V DC (Non-isolated differential)
Output Signal Type 4–20 mA DC
HART Communication Supported on input and output channels
Input Resistance (Power ON) ≥ 1 MΩ
Input Resistance (Power OFF) ≥ 340 kΩ
Conversion Accuracy Input ±4 mV / Output ±48 μA
Allowable Common Mode Voltage ±1 V
Temperature Drift ±0.1% per 10°C
Maximum Current Draw 310 mA (5 V DC) / 250 mA (24 V DC)
Module Weight 0.3 kg

System Integration and Safety

  • Commonly used in secondary control loops and monitoring stations.

  • Does not provide internal transmitter power; field devices must be powered via external 24 V sources or dedicated power modules.

  • Supports integration with HART-enabled instruments for remote monitoring and configuration.

Technical FAQ

Does the AAB841-S50 provide loop power to field transmitters?
No. The module requires external power sources for the 1–5 V input signals or a separate power distribution module.

What is the advantage of the differential input on this module?
Differential inputs improve measurement reliability by minimizing the effects of small ground potential differences between field devices and the DCS rack, as long as the common mode voltage stays within ±1 V.