Description

Metso NAIO‑03F 64669303 Analog Input‑Output Module

Technical Specifications

• Product Model: NAIO‑03F
• Part Number: 64669303
• Brand: Metso (Valmet DNA DCS System)
• Warranty: One Year
• Input Voltage: Powered by DNA rack backplane, auxiliary 24 VDC field supply (18‑30 VDC)
• Operating Temperature: ‑20 °C ~ +60 °C rack‑mount
• Storage Temperature: ‑40 °C ~ +85 °C
• Response Time: Analog channel scan cycle ≤8 ms
• Protection Class: IP20, cabinet‑only indoor installation
• Accuracy Class: Analog input/output ±0.15 % FS
• Output Frequency: DC analog signal, no AC frequency output
• Rated Current: Module consumption 210 mA @5 VDC backplane; field‑loop power subject to external 24 VDC supply
• Channel Configuration: 8 analog inputs (4‑20 mA / 0‑10 V configurable); 4 analog outputs (4‑20 mA / 0‑10 V configurable)
• Isolation: Field channel‑to‑backplane galvanic isolation 500 VAC
• Diagnostics: Over‑range, under‑range, wire break detection for analog loops; front‑panel LED status indicators; fault‑event logging
• Communication: Internal DNA DCS backplane bus for data exchange with DPU controller
• Mounting: Standard Metso DNA rack slot installation
• Dimensions / Weight: 140 mm × 140 mm × 40 mm; approx 0.51 kg
• 

Product Overview

The NAIO‑03F 64669303 is combined analog input and output module for Metso Valmet DNA distributed control system. It acquires analog process signals from field transmitters and outputs analog control signals to control valves, variable‑speed drives and other analog field actuators. Each channel supports software selection between 4‑20 mA current loop and 0‑10 V voltage signal modes. Built‑in wire‑break and signal over‑/under‑range diagnostics detect instrument loop failures and send alarm information to DCS controller. Galvanic isolation between field side and DCS backplane suppresses ground‑loop interference and transient surges in heavy‑dust, high‑humidity pulp‑and‑paper, power‑plant and process‑plant cabinet environments.

This combined I/O module addresses process‑control signal‑interface challenges: mixed AI/AO channels within single module, flexible signal‑type configuration, comprehensive loop diagnostics, drop‑in spare‑part compatibility for legacy DNA‑series retrofit‑maintenance projects. DCS automation engineers, pulp‑and‑paper and process‑plant maintenance technicians and retrofit integrators benefit most. Typical applications: paper‑machine process control cabinets, power‑plant auxiliary process loops, chemical‑plant analog instrument signal acquisition and output control.

Key Application Notes

‑Rack‑mount DCS I/O module; cannot operate standalone. Requires Metso DNA backplane rack, DPU controller and DNA engineering configuration software. ‑Full part number NAIO‑03F 64669303 must match for replacement; different NAIO‑03 hardware revisions are not fully interchangeable. ‑Not hot‑swap capable: Rack backplane power and field 24 VDC loop power must be fully de‑energized before module replacement. ‑Original OEM production discontinued; aftermarket surplus/refurbished spare parts circulate for legacy‑DCS system maintenance. ‑Conformal‑coated PCB variant exists for corrosive and high‑humidity cabinet environments. ‑Follow Metso NAIO‑03F hardware manual for channel signal‑type setup, loop‑load resistance calculation and fault‑diagnostic troubleshooting steps.