METSO S420154 I/O BACKPLANE IOB (I/O Backplane)
Product Description
The METSO S420154 is an industrial-grade PLC framework and I/O backplane module (PLC Rack with I/O Backplane Module).
It is mainly produced by Metso Automation (now part of Valmet or related business of Vappu) and its origin is usually Finland.
This product is a core infrastructure component of a distributed control system (DCS) or programmable logic controller (PLC),
responsible for providing physical support, power distribution, and signal communication buses for various functional cards.
2. Technical Data Sheet
Model/MPN: S420154
Component Name: I/O BACKPLANE IOB (I/O Backplane)
Back panel part number: 65428977 / 65428977A
Slot capacity: Generally supports I/O slots from 5 to 12.
Compatible sub-modules: Capable of accommodating functional boards such as TCU 41. TIU 61. BIU 8. PIC2. and IPU.
Weight: Approximately 5.65 kg – 5.7 kg.
Origin: Finland (Made in Finland).
Manufacturing standard: CSA Certified, CE Compliant.

S420154
3. Related Models / Components
This backplate is usually used in conjunction with the following components:
TCU 41: Transition Unit
TIU 61: Interface Unit
BIU 8: Bus Interface Unit
IPU: Intelligent Processing Unit / Power Unit
PIC2: Peripheral Interface Controller
4. Application Cases
The METSO S420154 is mainly applied in the field of heavy industry automation:
Mining and quarrying: Automated control systems for crushers (such as the Superior MKIII series), screening machines, and conveying systems.
Pulp and Paper: As part of the Valmet/Neles Automation system, control the papermaking process flow.
Metal smelting: Sensors for monitoring and actuators for control in the refining process.
Offshore and onshore energy: Suitable for monitoring of oil and gas processing or energy distribution that requires high reliability.
5. Product Advantages and Features
High Reliability: Designed for extremely harsh industrial environments (such as high temperatures, vibrations, and dust), ensuring uninterrupted operation of critical production lines.
Modular Design: Easy to expand and maintain. Supports hot swapping or quick replacement of sub-modules (such as TCU/TIU), reducing system downtime.
Outstanding communication performance: The backplane bus design ensures high-speed data exchange between the I/O module and the central processing unit.
Global standard certification: Possesses CSA and CE certifications, meeting international safety and electrical standards.
6. Other Models in the Series
In the automated hardware system of Metso/Volmet, the following models are often mentioned together with S420154:
S420153: Another specification of PLC frame or backplane.
PDP401: Distributed Processing Module.
547070-2B / M851004: CPU module.
A413111 (TIU 61): Interface board card.
A413325 (IPU): Power Processing Unit.