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

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.

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.