Functional Description
The AAB841-S50 (Style S2) is a hybrid analog I/O module designed for both the Yokogawa Electric Corporation CENTUM VP and ProSafe-RS control architectures.
This module provides 8 configurable voltage channels, each software-selectable as either analog input (AI) or analog output (AO). It is specifically optimized for high-density FIO (Field I/O) environments where compact, flexible loop configuration is required.
Designed for 1–5 V DC signal processing, the AAB841-S50 is well suited for localized skid systems and shared-ground applications where full per-channel galvanic isolation is not required.
Detailed Technical Specifications
| Parameter | Specification |
|---|---|
| Model Designation | AAB841-S50 (Style S2) |
| I/O Capacity | 8 channels (software configurable as AI or AO) |
| Signal Range | 1–5 V DC |
| System Platform | CENTUM VP / ProSafe-RS (FIO System) |
| Input Impedance | ≥ 1 MΩ |
| Output Load Resistance | ≥ 2 kΩ |
| Accuracy | ±0.1% of full scale (AI & AO) |
| Data Refresh Cycle | 10 ms per module |
| Current Consumption | 450 mA typical (5 V DC internal bus) |
| Dimensions | 32.8 mm (W) × 130 mm (D) × 107.5 mm (H) |
| Operating Temperature | -20°C to +70°C |
Module Comparison & Selection
The AAB841-S50 is a non-isolated hybrid module, making it ideal for:
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Internal cabinet wiring
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Shared-ground systems
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Compact skid-mounted control panels
-
Applications requiring flexible AI/AO assignment
For applications requiring full channel-to-channel galvanic isolation and higher noise immunity, engineers should consider isolated alternatives such as:
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AAI141 (voltage input, isolated)
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AAI541 (voltage output, isolated)
The AAB841-S50 excels in cost-sensitive or space-constrained designs where signal grounding is controlled and high-speed performance is required without individual channel isolation overhead.
Technical FAQ
Can the AAB841-S50 process 4–20 mA signals?
Directly, the module supports 1–5 V DC signals. To connect 4–20 mA devices, a 250 Ω precision shunt resistor must be installed at the terminal board to convert the current signal into a 1–5 V DC input.
Is the S2 revision compatible with older S1 installations?
Yes. Style S2 maintains backward compatibility in form factor and electrical characteristics while offering improved component longevity and lifecycle reliability.
How is channel direction (Input/Output) configured?
Channel direction is defined within the CENTUM VP Engineering Station during the I/O Builder configuration process. No hardware jumpers are required, allowing full software-based flexibility.
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