METSO S420071 Distributed I/O Interface Card / Process Bus Board

This model is a key component of the early distributed control system (DCS) series of Metso Automation (now part of Valmet).

1. Product Description

The METSO S420071 is an industrial-grade interface board / communication processing unit.

It is mainly used in Maestro’s early automation systems (such as Damatic XD or related series), serving as an important component of the fieldbus interface or I/O processing layer.

The main function of this module is to coordinate the signals of on-site sensors/actuators and convert them into data streams that can be recognized by the system bus, ensuring real-time monitoring and control in industrial production processes.

2. Technical Data Sheet

Model: S420071

Product Type: Distributed I/O Interface Card / Process Bus Board

Power supply for operation: Usually 24V DC (standard industrial voltage)

Installation method: Card-type design, installed on a specific PLC frame or backplane (such as S420154. etc.)

Communication protocol: Supports Ometec’s proprietary XD bus or other serial industrial bus protocols

Physical dimensions: Standard Maestro modular card dimensions

Origin: Finland

3. Related Models / Components

Model S420071 is typically installed together with the following hardware in the same rack:

S420154: I/O Backplane

TIU 61 / TCU 41: Conversion or Interface Unit

IPU Series: Intelligent Processing Unit

PDP 401: Distributed Processing Module

4. Application Cases

Due to its high reliability and real-time performance, S420071 is widely applied in:

Paper and Pulp Industry (Pulp & Paper): Carries out precise process control in the automated control systems of large paper machines (the predecessor of Valmet DNA system).

Electricity and Energy: Boiler control and monitoring systems for thermal power plants.

Mining and Metallurgy: Handling complex on-site data in the automation systems of crushing, grinding and beneficiation production lines.

S420071

5. Product Advantages and Features

Industrial-grade durability: Designed for use in demanding environments with 24/7 continuous operation, featuring excellent electromagnetic interference (EMI) resistance.

High real-time performance: The optimized internal logic ensures a signal processing delay of milliseconds, meeting the requirements of critical production processes.

Hot-swappable support: In certain system configurations, it is possible to replace modules without affecting the overall operation, thereby reducing maintenance downtime.

Precise Diagnosis: Equipped with status indicator lights (LEDs), it can promptly display the status of the module and whether the communication link is normal.

6. Other Models in the Series

This product is part of the Metso Classic Automated Hardware Series. The series also includes:

S420070: Early versions of similar functions or interface boards with different channel configurations.

S420072: Models that may have enhanced communication capabilities or more input channels.

A413325 / A413111: Commonly used interface processing cards and interface cards.