Description

Triconex 4200 Analog Output (AO) Module

This is an analog output (AO) module for Tricon systems. Its main function is to convert the digital control signal generated by the Tricon main processor (such as the 4200 series) into a standard, continuously variable analog signal (such as 4-20 mA or 0-5 V DC) to drive and control field devices.

 

 

 

Detailed Product Description

The Triconex 4329 is an Analog Output (AO) Module for the Tricon system. Its primary function is to convert digital control signals generated by the Tricon main processor (such as the 4200 series) into standard, continuously varying analog signals (e.g., 4-20 mA or 0-5 V DC) to drive and control field devices, such as:

• Control Valves (for modulating position)

• Variable Frequency Drives (for speed setpoint)

• Control signals for solenoid valves or positioners

• Other actuators requiring an analog command signal.

1. Key Features & Architecture

The design of the 4329 module adheres to the core Triconex requirements for high availability and safety. Its key features include:

• High-Density Design: A single 4329 module provides 16 channels of analog output, efficiently saving chassis space.

• Triple Modular Redundant (TMR) Support:

  • In a standard TMR configuration, three 4329 modules work together as a group.

  • Each module independently receives commands from one of the three main processors.

  • The three output signals for each channel are voted on in a “2-out-of-3” scheme at the Output Voter Module before being sent to the field device. This means a failure in any single 4329 module or its path will not affect the correct system output, providing high fault tolerance.

• Flexible Configuration: The 4329 module can also be configured for Simplex mode for applications with lower safety integrity requirements but still needing highly reliable output, optimizing cost.

• High Accuracy & Reliability: The module provides high-accuracy signal output, ensuring precise control of field devices, and features a rugged design to withstand harsh industrial environments.

• Comprehensive Diagnostics:

  • The module features continuous internal diagnostics to detect internal faults.

  • It supports Output Loop Monitoring, capable of detecting field circuit faults such as open wires or shorts. Diagnostic information is reported in real-time to the main processor, generating system alarms for quick troubleshooting by operators.

• Hot Swappable Maintenance: Aligning with the standard Triconex system feature, the 4329 module supports online replacement while the system remains powered and operational, greatly facilitating maintenance.

2. Technical Specification Summary

• Number of Output Channels: 16

• Output Signal Type: Typically 4-20 mA (most common), may also support other ranges like 0-5 V DC, depending on the module version and configuration.

• Resolution: High resolution (e.g., 16-bit), ensuring output signal precision.

• Compatibility: Designed for Tricon V9, V10, and newer chassis and systems.

• Operating Environment: Complies with industrial standards for typical plant environments.

3. Role in the System & Integration

Within a complete Triconex TMR system, the 4329 module is a critical component of the output section:

1. Input: Field signals enter the system via TMR Analog Input modules (e.g., 3700A).

2. Logic Solving: The three main processors (4200 series) execute the user logic program in sync and vote on the results.

3. Output: The main processors send the voted digital command to the three 4329 modules. Each 4329 converts the digital signal to an analog signal. These three analog signals are finally voted on at the output voter hardware, producing a single, correct 4-20mA signal to drive the field device.

4. Primary Application Fields

The Triconex 4329 module is widely used in critical safety and control applications requiring highly reliable analog control:

• Oil & Gas: Modulating control for platform shutdown valves, output for compressor anti-surge control.

• Chemical & Petrochemical: Feed flow control valves for reactors, pressure control valves for distillation columns.

• Power Generation: Control for boiler feedwater regulation valves.

• Any scenario requiring precise analog control from a Safety Instrumented System (SIS) or high-availability control system.