Description
Metso Automation D100789
Product Overview
The Metso Automation D100789 is a legacy IPU-2 Power Unit Module associated with Valmet Automation PLC and industrial control-system hardware. The part is consistently identified in equipment records as a power-unit module rather than a CPU, analog I/O module, digital I/O module, or communications card. One technical inventory record specifically describes D100789 as an IPU-2 power unit module for PLC/rack systems, installed as a slot-mounted module with an aluminum heat sink.
Its role is therefore infrastructure-level: the module belongs to the power architecture supporting the control-system rack and its installed electronics. That distinction is important during troubleshooting. If a D100789 fails, replacing it with a generic 24 VDC industrial power supply is not automatically equivalent. The rack interface, mechanical format, electrical input/output characteristics, protection functions, and system power distribution all need to match the original Valmet architecture.
D100789 is now a legacy component and is listed as discontinued by the manufacturer. Current procurement therefore tends to involve remaining surplus, unused legacy stock, or refurbished units rather than normal new-production supply. A separate D100789L designation is documented as an IPU2 input power unit, showing that suffix-level identification matters and should not be casually treated as interchangeable with every D100789 assembly.
For engineers maintaining older Valmet installations, the Metso Automation should be specified by its complete part number and physical/system context. Public sources do not provide enough reliable primary documentation to publish definitive input voltage, output voltage, current capacity, efficiency, or thermal limits for every revision.
Product Introduction
Power faults in legacy PLC racks can be deceptively difficult to diagnose because a failed power unit can make otherwise healthy CPU and I/O boards appear defective. Metso Automation is the IPU-2 power-unit module associated with that rack-level power architecture.
For a legacy replacement, verify the rack, mating connector, board markings, and complete identification before ordering. The objective is to reproduce the original power architecture, not simply match a nominal DC voltage.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Product Model | |
| Manufacturer / Brand | Metso Automation / Valmet Automation |
| Product Designation | IPU-2 |
| Product Type | Power Unit Module |
| Primary Application | Valmet PLC / industrial automation rack power |
| Installation Type | Slot-mounted module |
| Heat Dissipation | Aluminum heat-sink construction reported |
| Lifecycle | Discontinued by manufacturer |
| Input Voltage | Not reliably verified from authoritative documentation |
| Output Voltage | Not reliably verified |
| Output Current | Not reliably verified |
| Power Rating | Not reliably verified |
| Efficiency | Not reliably verified |
| Protection Functions | Not reliably verified |
| Operating Temperature | Not reliably verified |
| Communication Protocol | None established as a standalone communication function |
| Firmware | Not applicable as a generic PLC firmware specification |
The basic product identity is supported by multiple records: is described as a Power Unit Module, IPU-2, manufactured by Metso Automation Valmet.
Major Features / Practical Advantages
IPU-2 rack power function
is fundamentally a power-system component, not a process signal module. The designation separates it from Valmet CPU, analog I/O, binary I/O, and communications modules. Treating it as a rack power unit is important when diagnosing a control system that has lost multiple downstream modules simultaneously.
D100789
Slot-mounted architecture
Available equipment documentation identifies as a slot-mounted power unit for PLC/rack systems.
That means mechanical compatibility matters. A standalone industrial power supply with similar electrical output may still be unsuitable if it cannot interface correctly with the Valmet rack or provide the required system-level power distribution.
Legacy Valmet maintenance
The is discontinued by the manufacturer. For plants retaining older Valmet automation equipment, a tested spare can therefore be valuable for reducing shutdown exposure.
The practical benefit is not simply having a spare power supply on the shelf. It is having the correct assembly that can be evaluated against the installed rack before a failure occurs.
Heat-sinked construction
A supplier record specifically describes the as a slot-mounted module with an aluminum heat sink.
That physical feature is useful when comparing an incoming spare with the failed unit. It should not, however, be used to infer a particular wattage or thermal rating without the original electrical documentation.
Clear distinction from D100789L
A D100789L listing identifies that part as IPU2-MA65490100A- INPUT POWER UNIT. This is a useful procurement warning: similar-looking -family identifiers should be checked carefully rather than assumed to be interchangeable.
No unsupported modern-controller specifications
Some online pages currently describe as a dual-core or quad-core controller with Ethernet, EtherCAT, Profinet, IP67/IP68 protection, DDR4 memory, and wide-temperature operation. Those claims conflict with the much stronger and repeated identification of as a Valmet power unit.
Those processor and networking specifications should not be used in an engineering product description for .
Related Products
- D100789L — Related IPU2 input-power-unit designation; verify the complete suffix and installed system before considering it for replacement.
- D200136 — Metso power-supply product used in other automation architectures; not a confirmed drop-in replacement for .
- IPU-1 — Earlier/different Valmet power-unit designation; similar functional category but not automatically interchangeable.
- A413216 — Valmet CPU module; controller hardware rather than rack power hardware.
- A413050 — Valmet RSU CPU module/board; different system function.
- A413135 — Valmet AOU-4 analog output module; field-signal hardware rather than power infrastructure.
- A413150 — Valmet BOU-8 binary output module; discrete-output hardware rather than a power unit.
- IOP382 — Valmet PLC rack; relevant when verifying the physical rack architecture associated with a replacement module.
FAQ
What is Metso Automation ?
is identified as a Metso Automation / Valmet Power Unit Module used in legacy PLC/rack systems.
Is a CPU or PLC processor?
No. The strongest available product records identify it as a power unit module, not a CPU.
What voltage does output?
A reliable authoritative source establishing the exact output voltage and current rating for the base was not located. Those values should therefore be verified from the installed unit’s documentation or nameplate rather than copied from unrelated online listings.
Can I replace with a generic 24 VDC power supply?
Not as a direct substitution. is a slot-mounted Valmet power unit. A generic external supply may provide a similar nominal voltage while lacking the required rack interface, distribution, protection, mechanical installation, or system-specific behavior.
Can I hot-swap ?
Do not assume unrestricted hot-swapping. Because is part of the rack power architecture, removing it can affect multiple modules simultaneously. Follow the applicable Valmet maintenance procedure and place the control system in the required safe state before removing the power unit.
Does have firmware?
It should not be treated like a CPU or communications processor with a user-selectable firmware version. The available evidence identifies as a power-unit module. Claims that it contains a modern ARM processor or supports IEC 61131-3 programming are not supported by the stronger product identification.
Is D100789L the same as ?
Not necessarily. D100789L is separately identified as an IPU2 input power unit with the longer designation IPU2-MA65490100A-. Verify the complete label and system documentation before treating the two as interchangeable.
What should I verify before purchasing a replacement?
For a shutdown-critical spare, verify:
- Complete part number:
- designation
- Any revision or version marking
- Existing Valmet rack model
- Slot position
- Connector and backplane arrangement
- Input power requirements
- Required rack-side output rails
- Physical heat-sink and mounting arrangement
- Actual unit test evidence
Is New Surplus equivalent to current factory production?
No. is listed as discontinued by the manufacturer. New-surplus stock therefore means unused legacy inventory, not necessarily newly manufactured hardware. Storage age, packaging condition, capacitor condition, and prior storage environment should be considered during procurement.
Procurement Note
The Metso Automation should be purchased as a Valmet power-unit module, not as a generic industrial controller or generic DC power supply. Multiple records independently support that identification, while the more elaborate processor/network specifications appearing on some recent listings are inconsistent with the established description.
For procurement, the critical information is the complete marking, revision, rack compatibility, and power-system requirements. Ask for photographs of the actual module, including its label, connector side, and heat-sink assembly. If the supplier provides only a stock photograph or describes the unit as an Ethernet/EtherCAT controller, stop and verify the identification before placing the order.
A tested legacy spare is generally much more useful than a nominally similar power supply that has never been proven against the Valmet rack. For a planned shutdown, obtain functional-test evidence and compare the spare against the failed unit before installation.
