Metso IOP302 high-performance Analog Input Mod
The Metso IOP302 is a high-performance Analog Input Module (also categorized as a Digital Input module in specific high-density configurations) designed for the Metso DNA (formerly Valmet DNA) and maxDNA Distributed Control Systems.
It serves as a bridge between field-level analog sensors and the central processing unit, facilitating real-time data acquisition for industrial automation.
1. Introduction
The IOP302 module is part of the maxPAC I/O subsystem. Its primary function is to collect signals from field devices (such as pressure, flow, or level transmitters) and convert them into digital data for the system controllers.
It is widely recognized for its high channel density and robust isolation, making it a staple in large-scale power plants and pulp and paper mills.
2. Technical Parameter Table
| Parameter | Specification |
| Model Number | IOP302 (Part No: 181524) |
| Input Channels | 16 Channels |
| Input Type | 4–20 mA (Standard) / Analog Input |
| Loop Power | 24V DC (Individually fused per channel) |
| Scan Time | ~20 msec |
| Isolation | Field-to-Logic Galvanic Isolation |
| Power Consumption | Low power dissipation design |
| Calibration | Self-calibration on power-up; Online periodic re-calibration |
| Operating Temp | 0°C to +55°C |
| Dimensions | ~20.3 cm x 12.7 cm x 5.1 cm |
3. Related Models
The IOP series includes various modules tailored for different signal types within the Metso/Valmet DNA ecosystem:
IOP304: Digital Input/Output Processing Module (Mixed).
IOP305: Voltage Input Module (specifically for voltage rather than current).
IOP306: Dedicated Digital Output Module.
IOP314: Analog I/O Processing Module for high-precision monitoring.
IOP320: Often used as a companion for specific signal conditioning.
4. Application Cases
Power Generation: Monitoring steam pressure and water levels in boiler systems.
Pulp & Paper: Tracking chemical flow rates and tank levels in processing lines.
Mining & Minerals: Integrated into sensor-based sorting and grinding circuit controls.
Oil & Gas: Used in compressor stations for pressure and temperature transmitter interface.
5. Product Advantages and Features
Intelligent Diagnostics: Features “Open Input Detection” for every measurement, allowing the system to identify broken wires or sensor failures instantly.
High Reliability: Supports redundant configurations (N+1) when used in a standard maxDNA rack, ensuring the process remains online even if a module fails.
Hot-Swappable: Supports online replacement, meaning you can swap the module without shutting down the entire control rack.
Fast Integration: Software is stored in FLASH memory, allowing for easy updates and consistent performance without manual tuning.
6. Other Models in the Same Series
The IOP302 belongs to the maxPAC / Metso DNA I/O family, which also includes:
DPU404 / DPU4E: Distributed Processing Units (the “brains” that the IOP302 talks to).
PSM303: Power Supply Modules that provide the 24V DC backplane power.
CIO312: Communication Interface Modules that link the I/O subsystem to the wider DNA network.
RTD/TC-TB: Specific terminal blocks for resistance and thermocouple signals
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