Metso D201376 ACN RT (Real-Time) Controller Node

The Metso D201376 is a high-performance Processor / Controller Module within the ACN (Automation Cloud Node) family of the Metso DNA (now Valmet DNA) automation system. 

It represents the high-end tier of the "D-series" hardware, designed to act as the primary real-time controller for demanding industrial processes.

1. Introduction

The D201376 is a Real-Time (RT) Node that functions as the brain of the DCS (Distributed Control System). It is responsible for executing advanced control logic, managing high-speed communication across the DNA network, and supervising a large number of I/O modules (such as the D201134). 

This module is typically found in the latest generations of Valmet DNA, providing significantly more memory and processing power than the legacy DPU or early D200-series units.

2. Technical Parameter Table

3. Related Models

The D201376 is often the primary controller in a rack that includes:

D201134: 16-channel Analog Input Module.

D201135: 8/16-channel Analog Output Module.

D201126: 16-channel Digital Input Module.

D200175 / D200137: Earlier or specialized versions of the ACN processor.

ACN MR: The configuration where two D201376 units are paired for Master Redundancy.

4. Application Cases

Complex Process Loops: Managing large-scale chemical reactors or paper machine wet-ends requiring hundreds of PID loops.

High-Speed Machine Control: Controlling high-speed turbines or winders where execution cycles need to be consistently under 20ms.

Fleet Management: Acting as a central hub for multiple remote I/O stations in district heating or water utility networks.

DCS Modernization: Serving as the upgrade path for plants moving away from legacy PDP601 or DPU4E hardware.

5. Product Advantages and Features

Massive Throughput: Capable of handling a much higher I/O count and more complex "Function Block" logic compared to older D200 series models.

Hardened Design: The module is fanless and uses industrial-grade solid-state components, allowing it to reside in cabinets on the plant floor rather than climate-controlled server rooms.

Enhanced Security: Features modern encryption and secure boot capabilities to comply with increasing industrial cybersecurity requirements (IEC 62443).

Bumpless Redundancy: When configured in an ACN MR setup, the transition from primary to backup controller is completely invisible to the process.

Cloud-Ready: As part of the ACN (Automation Cloud Node) series, it is designed for better data integration with Valmet’s Industrial Internet (VII) solutions.

6. Other Models in the Same Series

The D201xxx series is the current standard for Valmet DNA architecture:

D201241: Specialized Temperature/RTD Input module.

D201150: Relay Output module for the ACN family.

D201220: Multi-protocol communication interface module.

ACN CS: The "Communication Server" variant of this hardware used for history and plant-wide data management.

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