Metso IOP Series Modules: IOP345 091124 Digital Input Module —

Technical Dossier

Product Details And Specifications

Metso IOP Series: Comprehensive Module Range and Technical Overview

The Metso IOP (Input/Output Processor) series is a core component family within the Metso DNA (Distributed Control System) automation platform, deployed extensively across global heavy industries including petrochemical refineries, nuclear power stations, pulp and paper mills, and offshore oil and gas facilities. The IOP series provides the physical interface layer between field instrumentation and the Metso DNA controller network, handling analog signal conditioning, digital state detection, pulse counting, and serial communication bridging. Installations of Metso DNA with IOP-series I/O modules are documented across hundreds of large-scale continuous process plants in Europe, Asia-Pacific, and the Americas, many of which have operational lifespans exceeding 25 years. The IOP345 091124 specifically is a Digital Input Module designed for high-density binary signal acquisition from field devices such as limit switches, relay contacts, and proximity sensors.

The Evolution of IOP Series Architecture

The Metso IOP series was introduced as part of the Metso DNA platform (formerly Neles Controls / Valmet Automation) in the late 1990s, succeeding the earlier Damatic XD and Damatic Classic I/O families. The original IOP architecture used a parallel backplane bus with proprietary Metso fieldbus protocol, enabling hot-swap module replacement without process interruption. Early IOP modules (IOP100–IOP200 range) supported basic analog and digital I/O with 8–16 channel densities. The mid-generation IOP300 series — which includes the IOP345 091124 — introduced higher channel density (up to 32 DI channels), improved noise immunity, and enhanced diagnostics accessible via the Metso DNA Engineering tool. Later IOP400 and IOP500 variants added HART pass-through capability and redundant power feed options. As of 2024, the IOP series is in the mature/end-of-active-production phase; Metso Automation (now part of Valmet) has transitioned new projects to the Metso DNA Next Generation I/O platform. However, the installed base of IOP-series hardware remains substantial, and long-term maintenance support for existing plants is the primary commercial driver for IOP module procurement.

IOP Series Full Catalog & Functionalities (SKU List)

Digital Input (DI) Modules

• IOP345 091124: 32-channel 24 VDC digital input module, dry contact and voltage input compatible
• IOP341: 16-channel 24 VDC digital input module, standard density DI for Metso DNA cabinets
• IOP342: 16-channel 48 VDC digital input module, suited for legacy field wiring at higher voltage
• IOP346: 32-channel digital input module with extended diagnostics and channel-level fault reporting
• IOP348: 16-channel digital input module with SOE (Sequence of Events) timestamping, 1 ms resolution

Digital Output (DO) Modules

• IOP351: 16-channel 24 VDC digital output module, transistor output, 0.5 A per channel
• IOP352: 16-channel relay output module, SPDT contacts, 2 A at 250 VAC
• IOP355: 32-channel 24 VDC digital output module, high-density DO for compact cabinet layouts

Analog Input (AI) Modules

• IOP311: 8-channel 4–20 mA analog input module, 12-bit resolution, HART revision 5/6 compatible
• IOP312: 16-channel 4–20 mA analog input module, multiplexed, standard process measurement
• IOP313: 8-channel analog input module with HART pass-through, individual channel isolation
• IOP315: 8-channel thermocouple/RTD input module, supports J, K, T, Pt100 sensor types

Analog Output (AO) Modules

• IOP321: 8-channel 4–20 mA analog output module, 12-bit resolution, loop-powered
• IOP322: 4-channel analog output module with HART capability, for positioner and valve control loops

Communication & Specialty Modules

• IOP371: Pulse input module, 4-channel, for flow totalizers and encoder feedback
• IOP381: Serial communication module, RS-232/RS-485, for third-party device integration
• IOP391: Fieldbus communication adapter, Profibus DP slave interface for IOP backplane

Sourcing Hard-to-Find & Obsolete IOP Series Parts

As the Metso IOP series has entered its end-of-active-production lifecycle, OEM channel availability for specific modules — particularly high-density digital I/O variants such as the IOP345 091124 — has become constrained. DriveKNMS maintains a dedicated inventory of new-surplus, refurbished, and tested-used IOP series modules sourced from decommissioned plant assets, authorized distributor overstock, and controlled secondary market channels. For plant operators committed to Metso DNA systems with 10–20 year remaining operational horizons, DriveKNMS provides lifecycle extension support including: module-level replacement supply, cross-reference identification for discontinued part numbers, and compatibility verification against specific Metso DNA software versions. Procurement inquiries for single units or bulk quantities are handled with lead-time commitments and condition-graded inventory disclosure.

Quality Control for the IOP Series Range

IOP series modules use a proprietary Metso backplane connector and internal bus protocol that requires functional validation beyond standard power-on testing. DriveKNMS applies a structured test protocol for all IOP modules prior to shipment: (1) Visual inspection of backplane connector pins, conformal coating integrity, and capacitor condition; (2) Powered bench test using a Metso DNA-compatible test rack to verify module enumeration and self-diagnostic pass status; (3) Channel-level functional test — for the IOP345 091124, all 32 DI channels are individually stimulated and state-verified against the module's internal register map; (4) Communication bus integrity check to confirm correct IOP address assignment and error-free data exchange with the test controller node; (5) Final firmware version logging and documentation included with shipment. Modules that fail any stage are quarantined, documented, and not released for sale.