Description
| Product model | IOP345 |
| Manufacturer | Metso (Valmet) |
| Product category | High-Density Digital I/O Processor Module |
| System platform | Metso DNA Distributed Control System (DCS) |
| Module type | Digital I/O processing unit with high channel density |
| Supported I/O cards | Up to 8 local I/O slots (digital input, digital output, relay, pulse) |
| Communication protocol | DNA Bus, Modbus TCP/IP, OPC UA |
| CPU processing power | 32-bit RISC processor with real-time operating system (RTOS) |
| Memory (RAM/Flash) | 64 MB RAM, 32 MB Flash |
| Redundancy support | Optional hot-standby redundancy (dual-processor configuration) |
| Operating temperature | 0°C to 55°C (32°F to 131°F) |
| Installation method | DIN rail mounting in 19-inch control cabinet (I/O chassis) |
| Typical applications | Sequence control, machine automation, safety interlocks, pump and valve control |
Product introduction
The Metso IOP345 is a high-performance digital input/output processing module designed for the Metso DNA automation system, delivering robust and reliable handling of discrete signals in industrial control environments. As a specialized processor within the DNA architecture, the IOP345 is optimized for applications requiring high-speed digital signal processing, such as machine sequencing, batch control, and equipment interlocking. It serves as a dedicated interface between the central controller and field-level digital devices, including pushbuttons, limit switches, motor contactors, relays, and status indicators.
The Metso IOP345 supports up to eight local I/O slots, enabling flexible integration of various Metso DNA digital I/O cards. This modular design allows users to configure the module for high-density digital input (DI), digital output (DO), or mixed signal types, making it ideal for complex automation tasks in pulp and paper, power, mining, and process industries. With support for optional redundancy, the IOP345 can be deployed in both standard and mission-critical applications, ensuring system availability and minimizing unplanned downtime.
Engineered for deterministic performance, the IOP345 features a 32-bit RISC processor and a real-time operating system, ensuring fast and predictable scan cycles. It communicates seamlessly with the central controller via the high-speed DNA Bus, enabling synchronized control and rapid data exchange. The module is fully integrated into the Metso DNA engineering environment, allowing for centralized configuration, diagnostics, and monitoring through Valmet DNA software tools, simplifying system design, commissioning, and maintenance.
IOP345 METSO
Core advantages and technical highlights
High channel density and modular flexibility:
The Metso IOP345 supports up to eight I/O cards, enabling configurations with hundreds of digital channels in a single chassis. This high channel density reduces cabinet space and wiring complexity, especially in machine control panels with numerous discrete signals. Users can mix DI, DO, and relay output cards to meet specific application needs, such as controlling multiple pumps or monitoring extensive status feedback.
Deterministic real-time performance:
Equipped with a dedicated 32-bit RISC processor and real-time OS, the IOP345 ensures sub-millisecond response times for digital signal processing. This is critical for time-sensitive applications like emergency stop logic, turbine trip systems, and fast machine sequences where delays can lead to safety risks or production losses.
Optional redundancy for enhanced reliability:
While often used in non-redundant roles, the IOP345 supports hot-standby redundancy when deployed in critical systems. In redundant mode, a secondary IOP345 remains synchronized with the primary, enabling seamless failover during hardware faults or maintenance, ensuring uninterrupted digital control.
Integrated diagnostics and health monitoring:
The module includes comprehensive self-diagnostics that monitor power supply, communication status, I/O card health, and field signal integrity. Faults are reported in real time via the Metso DNA operator interface, enabling predictive maintenance and rapid troubleshooting. Front-panel LEDs provide immediate visual indication of module status (Run, Fault, Comm, Power).
Seamless integration with Metso DNA ecosystem:
As part of the Metso DNA platform—now maintained and enhanced by Valmet—the IOP345 benefits from long-term software support, firmware updates, and cybersecurity improvements. Its compatibility with existing DNA tools ensures smooth integration into legacy systems and new installations alike.
Typical application scenarios
The Metso IOP345 is widely deployed in industrial settings where reliable and fast digital control is essential. In pulp and paper mills, it manages machine-side logic for paper machine drives, reel splicing systems, and sheet break detectors, where rapid response to discrete events prevents costly downtime and product waste.
In power plants, the IOP345 is used in auxiliary systems such as boiler feed pumps, cooling towers, and switchgear control, handling start/stop sequences, interlocks, and alarm monitoring. Its ability to process high-frequency pulse inputs also makes it suitable for turbine speed monitoring and flow metering applications.
In mining and mineral processing, the IOP345 controls conveyor belts, crushers, and sorting systems, where sequence logic and equipment interlocking are crucial for safety and operational efficiency. Its robust design ensures stable performance in electrically noisy and vibration-prone environments.
In water and wastewater treatment plants, the IOP345 manages pump stations, valve actuators, and level control systems, providing reliable on/off control and status feedback. Its support for relay outputs allows direct interfacing with motor contactors, reducing the need for external relay panels.
Due to its modular design and diagnostic capabilities, the Metso IOP345 is also a preferred choice for plant-wide automation upgrades, where it replaces older digital controllers while maintaining compatibility with existing infrastructure.
Related model recommendations
Metso IOP304: General-purpose redundant I/O processor for mixed analog/digital applications.
Metso IOP341: Similar digital I/O processor, often used interchangeably with IOP345 in non-redundant roles.
Metso IOP314: High-performance I/O processor with enhanced processing power for complex control.
Metso DIO330: 32-channel digital input card compatible with IOP345 chassis.
Metso DIO340: 16-channel relay output card for driving motors and solenoids.
Metso DIO350: High-density digital output module with solid-state switching.
Metso PCD230: Standalone programmable controller in Metso DNA system.
Metso FIO311: Fiber optic interface module for extending DNA Bus to remote I/O.
Metso PSM302: Redundant power supply module for IOP345 chassis.
Metso CIO312: Communication interface module for Profibus or Modbus integration.
IOP345 METSO
Installation preparation
Before installing the Metso IOP345, ensure the control cabinet is clean, well-ventilated, and free from dust and moisture. Mount the DIN rail securely according to IEC standards. Use only approved 24 VDC power supplies (e.g., Metso PSM302) and verify proper grounding. Discharge static electricity using an ESD wrist strap. Insert the IOP345 firmly into the backplane and secure it with the locking mechanism. For redundant setups, install both primary and standby units before powering the system. Label all DNA Bus and field wiring for easy identification.
Maintenance suggestions
Regularly check the status LEDs on the Metso IOP345 for normal operation. Use Valmet DNA software to review diagnostic logs and detect early signs of I/O card failure or communication issues. Perform firmware updates during planned shutdowns. Clean air filters and check cabinet cooling every six months. The IOP345 supports hot-swappable I/O cards, allowing field device replacement without process shutdown. Store spare modules in anti-static packaging and verify configuration after hardware changes.
