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Product Introduction
The Yokogawa AAM51-S1 is a high-performance Analog Output Module designed for use in the CENTUM CS 3000 / VP distributed control systems (DCS). It is an integral component in industrial automation systems where analog signal output is required to drive final control elements such as control valves, I/P converters, variable frequency drives (VFDs), and other field devices.
This module is capable of delivering both current (4–20 mA) and voltage (1–5 V) outputs, making it highly versatile across a wide range of industrial applications. It provides stable and accurate analog output signals and is equipped with built-in diagnostics and self-checking capabilities to ensure safe and reliable plant operation.
Designed with Yokogawa’s signature reliability, the AAM51-S1 is widely used in industries like oil & gas, petrochemical, chemical, power generation, and pharmaceutical manufacturing where precision and long-term operational integrity are critical.
Technical Specifications
| Parameter | Description |
|---|---|
| Model Number | AAM51-S1 |
| Product Category | Analog Output Module |
| System Compatibility | CENTUM CS 3000 / VP DCS |
| Output Type | Current (4–20 mA), Voltage (1–5 V) |
| Number of Channels | 8 channels per module |
| Output Accuracy | ±0.1% of span |
| Load Resistance (Current) | 0–750 Ω |
| Load Resistance (Voltage) | 10 kΩ or higher |
| Isolation | Channel-to-channel and channel-to-ground isolation |
| Self-Diagnosis Function | Yes (channel diagnostics, communication errors, etc.) |
| Power Supply | Supplied from the FCS (Field Control Station) |
| Response Time | ≤ 100 ms |
| Temperature Range (Operation) | 0 to 50°C (32 to 122°F) |
| Humidity Range | 5% to 95% RH, non-condensing |
| Installation | Mounted in I/O cabinet on Yokogawa V-Net |
| Dimensions | 130 × 27 × 130 mm |
| Weight | 0.113 kg |
| Certifications | CE, CSA, UL, ATEX Zone 2 (with system compliance) |
| Hot Swap Support | Yes (without stopping the system) |
| LED Indicators | Channel status, module health, power status |
| Configuration Interface | Via Yokogawa PRM / DCS engineering station |
Applications
The AAM51-S1 module serves as a critical interface between control systems and field devices, especially in plants where precise analog control is necessary. Its applications include:
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Control Valve Positioning – Converts DCS control signals into precise current to drive control valves via I/P transducers.
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Variable Frequency Drive (VFD) Control – Sends voltage or current signals to modulate motor speeds.
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Batch Process Automation – Provides analog outputs for temperature, flow, or pressure controllers.
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Pharmaceutical Cleanroom Environments – Maintains control over HVAC and pressurization systems using analog signals.
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Chemical Reactor Control – Ensures accurate chemical dosing or thermal regulation via analog drives.
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Power Plant Systems – Controls auxiliary equipment like boiler fans or fuel feeds with 4–20 mA outputs.
The module is widely deployed in process plants where loop integrity, signal precision, and system reliability are of paramount importance.
Product Advantages
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Dual Output Type Support: The ability to output both current and voltage increases deployment flexibility across diverse control scenarios.
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High Reliability: Yokogawa’s design guarantees long-term durability with channel isolation and protective diagnostics, reducing downtime.
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Hot Swap Functionality: Enables maintenance and module replacement without system shutdown—critical in 24/7 environments.
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Fast Response Time: With sub-100 ms response, it ensures real-time control over fast-acting actuators and regulators.
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Modular Design: Easily scalable with other Yokogawa modules, allowing for future expansion without design overhaul.
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Integrated Diagnostics: Proactively detects channel issues, signal deviation, or hardware faults, helping maintenance teams react before failure.
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Robust Construction: Operates reliably in challenging industrial conditions including high humidity and temperature variations.
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Certified for Safety: Suitable for use in hazardous zones when installed with compliant systems—trusted in oil & gas and refining.
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Seamless Integration: Fully integrated with Yokogawa PRM, CENTUM VP, and Plant Resource Manager for streamlined operations.
Frequently Asked Questions (FAQ)
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Can the AAM51-S1 be configured for mixed current and voltage outputs per channel?
No. All channels must be configured for either current or voltage mode. Mixing on the same module is not supported. -
Is the AAM51-S1 hot-swappable?
Yes, the module can be replaced while the system is running, minimizing downtime. -
Does this module support channel-to-channel isolation?
Yes, each channel is isolated to prevent cross-talk and ground loop interference. -
What is the maximum loop resistance for the current output mode?
The module supports up to 750 Ω of loop resistance. -
Can this module be used in safety instrumented systems (SIS)?
Not directly. It is for process control use only, not certified for SIL-level safety systems. -
What’s the typical life expectancy of this module?
Under normal operating conditions, the service life is 10+ years. -
How is the module configured or diagnosed?
Using Yokogawa’s PRM software or via the CENTUM DCS engineering station. -
Can the module withstand a power surge or transient?
Yes, it has built-in surge protection as per Yokogawa’s industrial-grade standards. -
What happens if a channel fails?
The module will report a diagnostic alarm and can continue functioning on the remaining channels. -
Does it require calibration after installation?
Factory-calibrated. However, periodic calibration per plant standards is recommended for high-accuracy applications.
Related Models (Same Series or Functionally Similar)
| Model Number | Description | Channels | Output Type | Notes |
|---|---|---|---|---|
| AAM50-S1 | Analog Output Module (Current only) | 8 | 4–20 mA | Older version of AAM51-S1 |
| AAM53 | High Precision AO Module | 4 | 4–20 mA or 1–5 V | For demanding high-accuracy loops |
| AAP135 | AO Module with self-diagnostics | 16 | Current | Higher density, newer platform |
| ADV551-P50 | Analog Output Module for ProSafe-RS system | 8 | 4–20 mA | For use in SIS applications |
| AAM71-S1 | Analog Output with redundant channel support | 8 | 4–20 mA | Redundancy-enabled version |
| NFAI141 | AO Module (N-IO architecture, newer systems) | 8 | Configurable per channel | For Yokogawa’s next-gen field architecture |
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