Industrial-grade I/O for DCS

Single- and Multi-channel I/O


Valmet I/O hardware provides a full range of digital and analog interfaces and high-speed controls for Valmet Controllers with single-channel or multi-channel I/O modules. Combining the best of centralized and distributed I/O technologies in a compact format, Valmet's I/O portfolio is simple yet powerful.

Easy to assemble with standard DIN rail installation and front I/O connections

Engineered to withstand extreme environments according to IEC 60721-3-3K3

Hot-swappable components and fully redundant configuration options

I/Os for harsh environments

Valmet I/O hardware is built to withstand the harsh environments of industrial processes while delivering fast control speeds and high-accuracy interfaces. Each unit has conformal coating as standard and an operating temperature up to +70 °C. Optional redundancy on the I/O cabinet level is implemented using dual Fieldbus, power feed, and communication unit per pair. Extensive channel-specific diagnostics, available without additional engineering, ensure you can stay on top of hardware performance. Should an I/O unit need replacing, you change any number of I/O units during operation. Hot swapping is a standard feature of all Valmet I/O models.

  Type Valmet DNA Valmet DNAe
ACN M80 Multi-channel X X
ACN M120 Multi-channel X X
Signal I/O Single-channel - X


Multi-channel I/O

Valmet ACN M80 and M120 series multi-channel I/O units provide robust design and high availability in harsh conditions. ACN M80 is designed for low-voltage and low-current analog/digital applications.

ACN M120 series is designed for high-voltage isolation between the channels and it supports digital interfaces for high DC/AC line voltages without external relays. It also enables high performance in machine condition monitoring and other special features. ACN M120 can also have redundancy on the I/O level when extremely high availability is required.

Valmet ACN M80 and M120 I/O units are compatible with Valmet DNAe and DNA Distributed Control Systems.

Single-channel I/O

A single-channel Valmet Signal I/O extends the I/O modularity even further. You can now choose each I/O interface separately and easily change those later without dependencies. Signal I/O offers low and high voltage I/O, condition monitoring I/O, and special interface modules all in one portfolio.

Signal I/O opens new opportunities in project engineering and work split between the suppliers.

Valmet Signal I/O is compatible with the latest generation Valmet DNAe Distributed Control System.


  Type Mounting Supply voltage

I/O interface voltage range

Controller redundancy
I/O redundancy
Exi interfaces Condition monitoring interfaces Ch-system isolation Ch-Ch
Conformal coating Hot-swap
ACN M80 Multi-channel Rail +24 VDC 0…30 V Yes No No  No Yes No Yes Yes
ACN M120 Multi-channel Rail +24 VDC 0….240 V Yes Yes Yes Yes Yes Yes Yes Yes
Signal I/O Single-channel Rail +24 VDC 0….240 V Yes Yes Yes (Pending) Yes Yes Yes Yes Yes


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