METSO DNA IOP331 181207 Modules

Technical Dossier

Product Details And Specifications

METSO DNA Series: Comprehensive Module Range and Technical Overview

The Metso DNA (Distributed Network Architecture) automation system is a full-scale distributed control platform deployed across the global heavy process industries, including pulp and paper mills, chemical plants, oil refineries, power generation facilities, and nuclear auxiliary systems. The DNA platform is engineered for continuous, high-availability operation in environments where process uptime is measured in years, not hours. The IOP331 181207 is a field-proven I/O module within this architecture, designed for reliable analog and digital signal interfacing between field instrumentation and the DNA controller backbone.

Metso DNA installations span hundreds of sites across Europe, Asia-Pacific, and the Americas. The modular backplane design of the DNA system means that individual modules such as the IOP331 181207 can be replaced or upgraded without full system shutdown, making spare parts availability a critical operational concern for plant maintenance teams.

The Evolution of DNA Series Architecture

The Metso DNA platform evolved from the earlier Neles Controls and Valmet Automation product lines, consolidating under the Metso brand following the 1999 merger. Early DNA hardware (circa 2000–2006) used proprietary backplane buses with limited hot-swap capability. The mid-generation DNA architecture (2006–2014) introduced the IOP3xx module family, standardizing the physical form factor and expanding I/O channel density. The IOP331 181207 belongs to this mid-to-late generation, featuring an enhanced signal conditioning circuit and improved EMC shielding compared to its IOP310/IOP320 predecessors.

From 2015 onward, Metso began transitioning select installations toward the DNA Next Generation (DNA NG) platform, which introduced Ethernet-based field communication. However, the installed base of IOP3xx-series modules remains extensive, and Metso has committed to providing spare parts and firmware support through extended lifecycle programs. Plants operating legacy DNA systems must source IOP3xx modules from certified aftermarket suppliers as OEM production volumes decline.

DNA Series Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly deployed modules within the Metso DNA IOP3xx and associated series. Each module is classified by functional category.

Analog Input Modules (AI)

• IOP331 181207: 8-channel analog input module, 4–20 mA HART-compatible, field-side isolation
• IOP321 181206: 8-channel analog input, standard 4–20 mA, non-HART variant
• IOP311 181205: 4-channel analog input, high-accuracy thermocouple/RTD input module
• IOP341 181208: 16-channel analog input, high-density rack-mount configuration
• IOP351 181209: 8-channel analog input with redundant signal path support

Analog Output Modules (AO)

• IOP332 181217: 8-channel analog output, 4–20 mA, loop-powered field devices
• IOP322 181216: 4-channel analog output, high-current drive capability
• IOP342 181218: 16-channel analog output, high-density, DIN-rail compatible

Digital Input Modules (DI)

• IOP361 181231: 32-channel digital input, 24 VDC, sink/source configurable
• IOP371 181232: 16-channel digital input, 120 VAC field voltage compatible
• IOP381 181233: 32-channel digital input with SOE (Sequence of Events) timestamping, 1 ms resolution

Digital Output Modules (DO)

• IOP362 181241: 32-channel digital output, 24 VDC, 0.5 A per channel
• IOP372 181242: 16-channel relay output, SPDT contacts, 2 A rated
• IOP382 181243: 16-channel digital output, high-current 2 A per channel, short-circuit protected

Communication & CPU Modules

• ACN11 180101: DNA Application Controller Node, dual-redundant CPU module, primary process controller
• ACN12 180102: Redundant ACN controller node, hot-standby failover, paired with ACN11
• FBM201: PROFIBUS DP fieldbus master module, supports up to 125 slave devices
• FBM220: FOUNDATION Fieldbus H1 linking device, 4-segment, intrinsically safe option

Power Supply Modules

• PSU24 180501: 24 VDC backplane power supply, 10 A output, redundancy-capable
• PSU48 180502: 48 VDC field power supply module, for high-voltage I/O racks

Sourcing Hard-to-Find & Obsolete DNA Series Parts

DriveKNMS maintains a dedicated inventory program for Metso DNA IOP3xx series modules, including the IOP331 181207 and related variants. As Metso transitions its manufacturing focus to DNA NG hardware, OEM availability of legacy IOP3xx modules has become constrained. DriveKNMS sources verified surplus, refurbished, and new-old-stock (NOS) units through a global network of industrial equipment suppliers and decommissioned plant auctions.

All sourced IOP331 181207 units are cross-referenced against Metso's published part number database to confirm hardware revision compatibility. DriveKNMS provides documentation of module revision codes (e.g., 181207 Rev. C vs. Rev. D) to ensure backward compatibility with existing DNA backplane configurations. For plants requiring long-term maintenance agreements (LTMAs) covering IOP3xx modules, DriveKNMS offers multi-year supply contracts with guaranteed stock reservation.

Quality Control for the DNA Series Range

Each IOP331 181207 module processed by DriveKNMS undergoes a structured test protocol designed specifically for DNA-series backplane and bus communication hardware:

• Backplane Bus Integrity Test: Module is seated in a reference DNA backplane and subjected to full DNA bus communication cycle verification, confirming correct node addressing and data throughput.
• Channel-Level Signal Verification: All 8 analog input channels are individually stimulated with calibrated 4–20 mA signals. Output readings are compared against factory calibration tolerances (±0.1% full scale).
• HART Communication Test: HART protocol handshake is verified on each channel using a HART communicator, confirming secondary variable transmission and device descriptor response.
• Isolation Resistance Test: Field-side to backplane-side isolation is measured at 500 VDC, minimum 100 MΩ required for pass.
• Thermal Cycling: Modules flagged as refurbished are subjected to 4-hour thermal cycling (0°C to 55°C) to screen for latent solder joint failures.
• Firmware Revision Check: Onboard firmware version is read and logged. Modules with outdated firmware are updated to the latest compatible release prior to shipment.