METSO IOP353 Digital Output Module
the Metso IOP353 is a specialized Digital Output Module within the maxPAC I/O family, used in the Metso DNA and maxDNA Distributed Control Systems.
It is distinct from the IOP351 in its electrical characteristics and power handling.
1. Introduction
The IOP353 is a 16-channel Digital Output Module. While other modules in the series use physical relay contacts (like the IOP351), the IOP353 is often configured for Solid State or specific Sourcing/Sinking switching.
It is designed to drive discrete field devices such as solenoid valves, pilot lights, and small interposing relays. It provides a reliable interface between the DPU logic and the plant’s physical actuators.
2. Technical Parameter Table
| Parameter | Specification |
| Model Number | IOP353 (Part No: 181557) |
| Output Channels | 16 Channels |
| Output Type | Discrete Digital (Sourcing/Solid State) |
| Operating Voltage | 24V DC (Standard) |
| Max Current per Channel | ~0.5 A to 1.0 A (Depending on load type) |
| Isolation | 1500V AC (Field-to-Logic Galvanic Isolation) |
| Status Indicators | 16 individual Red/Yellow LEDs for channel status |
| Response Time | High speed (< 1 ms switching time) |
| Mounting | maxPAC I/O Chassis / IOT300-series base |
| Operating Temp | 0°C to +55°C |
3. Related Models
The IOP353 is typically used alongside these complementary modules:
IOP351: 16-channel Relay Output (for high-current AC/DC switching).
IOP330: 16-channel 24V Digital Input (the sensing counterpart).
IOP350: A variant digital output module with different circuit protection.
CPO353: The specific Connection Pole used for landing field wires for this module.
4. Application Cases
Pneumatic Valve Control: Driving 24V DC solenoid coils for air-operated valves.
HMI Indicators: Controlling physical lamp panels or “annunciator” windows on a control desk.
PLC Interfacing: Sending discrete handshake signals to third-party PLCs (e.g., Siemens or Rockwell).
Sequence Control: Managing the high-speed timing of conveyor gates or sorting arms in manufacturing.
| EASON | 900 |
| EASY | E2384-E4-1100 |
| Eaton | MPB2-TP |
| Eaton | DPM-MC2 |
| EATON | XV-442-57CQB-1-10 |
| EATON | 8922-RB-IS |
| EATON | XVS-430-10MPI-1-10 |
| Eaton | XIOC-BP-XC1 |
| EATON | CS-TX3-3. 81X2.54-64TW |
| Eaton | MP3010 66D2205G01 |
| EATON | XV-440-12TSB-1-10 |
| EATON | XV-430-12TSB-1-10 |
5. Product Advantages and Features
High-Speed Switching: Because it utilizes solid-state technology rather than mechanical relays, it has a significantly longer lifespan in high-frequency switching applications.
Inductive Load Protection: Features internal suppression to protect the module from the “flyback” voltage spikes generated when switching inductive loads like solenoids.
Short-Circuit Detection: Intelligent monitoring helps identify if a field wire has shorted, often reflected in the module status LEDs or DNA software diagnostics.
High Density: 16 channels in a single slot allows for a compact cabinet footprint, reducing the need for multiple expansion racks.
6. Other Models in the Same Series
The IOP353 belongs to the maxPAC / Metso DNA hardware ecosystem:
DPU-MR / PDP601: The processing units that execute the logic for the IOP353.
IOP302: 16-channel Analog Input.
IOP320: 8-channel Analog Output.
PSM303: The power supply module providing the 24V DC logic and field bus power.