Metso D201134 high-density Analog Input Module
The Metso D201134 is a high-density Analog Input Module belonging to the ACN (Automation Cloud Node) I/O family within the Metso DNA (now Valmet DNA) automation system. It represents the modern generation of I/O hardware, designed to replace legacy 100 and 300-series modules with improved speed and reliability.
1. Introduction
The D201134 is a 16-channel Analog Input Module that primarily handles standard current signals (4–20 mA). It is designed to work with the ACN RT and ACN MR controllers. This module is the “workhorse” for modern Valmet DNA installations, providing the interface for pressure, flow, and level transmitters. It is characterized by its compact form factor and advanced digital signal processing capabilities.
2. Technical Parameter Table
| Parameter | Specification |
| Model Number | D201134 |
| Input Channels | 16 Channels |
| Signal Type | 4–20 mA / 0–20 mA (Current) |
| A/D Resolution | 16-bit High Precision |
| Accuracy | $\pm 0.05\%$ to $0.1\%$ of Full Scale |
| Input Impedance | 250 $\Omega$ |
| Isolation | Galvanic isolation (Channel-to-Logic) |
| Loop Power | 24V DC integrated per channel |
| Sampling Rate | High-speed (Up to 10 ms update rate) |
| Operating Temp | -20°C to +70°C |
3. Related Models
The D201134 is part of the “D201” I/O family, which features a unified mechanical design:
D201135: Analog Output Module (the counterpart to the D201134).
D201126: Digital Input Module (24V/48V).
D201129: Digital Output Module.
D201241: Specialized RTD/Temperature Input Module.
D200175: The ACN Controller that typically manages this I/O module.
4. Application Cases
Process Instrumentation: Connecting a high volume of 4–20 mA sensors in pulp and paper fiber lines.
Chemical Processing: Monitoring temperature and pressure transmitters in corrosive or demanding environments.
Water Treatment: Managing large-scale flow meter data for municipal or industrial filtration systems.
Modernization Projects: Frequently used to replace older IOP302 modules during DNA system upgrades (Migration to ACN).
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5. Product Advantages and Features
High Density & Compactness: 16 channels in a slim module significantly reduces the footprint of control cabinets compared to legacy hardware.
Extended Temperature Range: Designed to operate in environments from -20°C to +70°C, making it suitable for field-mounted cabinets without auxiliary cooling.
Enhanced Diagnostics: Provides “HART-ready” capabilities (depending on firmware) and detailed channel-level diagnostics, such as wire-break and short-circuit detection.
Hot-Swappable: Can be replaced while the system is live without affecting the operation of other modules in the same rack.
Superior Filtering: Advanced digital filtering helps reject electrical noise (EMI) common in heavy industrial settings.
D201134
6. Other Models in the Same Series
The D20xxxx series is the current standard for Valmet DNA I/O:
D201134-B: Specific revision for enhanced loop power stability.
D201128: 8-channel Analog Input variant for smaller installations.
D201220: Specialized communication interface for third-party bus protocols.
ACN RT / ACN MR: The processing nodes that serve as the backbone for these I/O units