Product Core Brief

• Model: D201376
• Brand: Metso (Valmet Legacy Automation)
• Series: MasterPiece 2001 ACN CS I/O Subrack & Backplane Family
• Core Function: Host up to eight 3U Eurocard I/O modules, distribute stabilized 24VDC rack power and proprietary internal DCS bus communication signals between the D201925 main CPU and all installed field I/O hardware.
• Product Type: 8-slot plastic/metal composite hot-swappable I/O subrack backplane chassis
• Key Specs: 8 universal 3U Eurocard slots | Integrated isolated power distribution bus | MasterPiece proprietary internal communication bus routing
• Condition: New Original (New Surplus); Fully Discontinued EOL, OEM factory production terminated.

Key Technical Specifications

• Slot capacity: 8 standard 3U vertical Eurocard module positions
• Supported hardware: All D201xx analog input, analog output, digital input, digital output I/O cards for MasterPiece 2001
• Bus interface: Proprietary parallel MasterPiece internal I/O communication bus, direct hardwired trace routing
• Power distribution: Integrated copper bus bars delivering isolated 24VDC logic power from D201832 / D200136L rack power supplies
• Hot-swap bus design: Slot-level buffered bus isolation to suppress transients during single module insertion/removal
• Overcurrent protection: Slot-by-slot passive current limiting fuses built into backplane traces
• Operating ambient range: -20°C to +60°C cabinet; storage -40°C to +85°C
• Construction: Flame retardant ABS plastic housing with galvanized steel heat sink ventilation grilles
• Physical dimensions: 485mm W × 305mm L × 120mm D; unit mass 1.8 kg
• Mechanical locking: Spring-loaded module ejector latches for secure Eurocard seating and easy service extraction
• Safety compliance: CE, UL, RoHS, SIL2 functional safety certification for continuous pulp/paper process control racks
• Compatibility constraint: Cannot intermix Valmet DNA or Advant 400 series I/O hardware due to mismatched bus pinout and slot geometry

Product Introduction

Metso acts as the central signal and power distribution backbone for mid-size MasterPiece 2001 pulp and paper DCS racks. It mechanically mounts all analog and digital I/O cards while routing low-noise 24VDC power and high-speed internal bus signals between the rack CPU and field signal hardware.

Its core differentiator is slot-level bus buffering and independent per-slot current limiting. A shorted I/O module only cuts power to its assigned slot without disrupting communication or power delivery to the remaining seven installed cards, limiting process downtime during field wiring fault events.

Firmware/Software Versions & Upgrade Notes

This backplane is a passive mechanical bus carrier with no onboard microcontroller or flash firmware. All communication protocol logic, I/O mapping, and loop scaling parameters reside on the D201925 main CPU and D200175 PMM personality module. No firmware flash operations apply to the unit itself.

• Supported MasterTool configuration software versions: v4.05 through v5.7; MasterTool v6.x drops native bus compatibility with MasterPiece 2001 backplane hardware.
• Critical matching rule: All I/O cards installed must use D-series MasterPiece hardware; cross-installation of non-D-series modules breaks bus handshake and triggers rack-wide fault alarms.
• OEM constraint: Metso halted official MasterPiece 2001 platform technical support after 2022; validate CPU and I/O firmware archive files before cabinet rebuild projects.

Frequently Asked Questions

1. Can I hot-swap I/O cards into the chassis while the rack remains fully powered?The backplane includes buffered slot bus circuits that prevent full rack communication loss during single module swaps, but you must disconnect all field wiring on the target I/O card before extraction. Live field shorts create power transients on the internal bus that can corrupt recipe and tuning data stored on the PMM memory module. Always isolate field terminal blocks first.
2. Can I source a direct drop-in OEM replacement now that this hardware is EOL?Metso no longer manufactures the chassis, and modern Valmet DNA rack backplanes use incompatible slot dimensions, bus pinouts, and power distribution layouts that prevent plug-and-play retrofits. New Surplus unopened factory stock is the only direct replacement option; third-party refurbished backplanes require full continuity and bus signal bench testing before cabinet installation.
3. Will swapping this chassis erase programmed I/O mapping or loop control parameters?No configuration data resides on the backplane hardware. All channel scaling, interlock logic, alarm thresholds, and bus communication mapping save to the D200175 PMM personality module and D201925 CPU flash memory. Complete a full PMM and CPU program backup via MasterTool before chassis replacement to guard against unexpected bus handshake failures.
4. What warranty coverage comes with New Surplus inventory versus refurbished chassis units?Our New Surplus stock carries a 12-month full functional warranty matching original OEM spare coverage. Refurbished aftermarket backplanes ship with only a 3–6 month limited warranty, as aged copper bus bar traces, worn module latch springs, and degraded plastic insulation create unquantified risk of intermittent bus communication faults during critical production runs.
5. Why is New Surplus chassis stock priced higher than aftermarket refurbished equivalents?New Surplus inventory retains factory-calibrated bus trace impedance, zero cycle wear on module latches, and full traceability to OEM production batches. Refurbished units often reuse cracked plastic frames, reworked bus bar connections, and skip 24-hour full-slot thermal load testing; hidden continuity defects lead to unplanned line downtime with far greater total operational cost than the upfront component price difference.
6. What maximum total I/O load can the backplane support without voltage drop?The integrated copper power bus supports a combined total load of 120W across all eight installed I/O modules. If mixing high-power analog output and relay output cards, split heavy loads across separate chassis to avoid excessive DC voltage sag on the 24VDC logic rail.
7. Can I install a D201925 main CPU directly into one of the eight slots on this chassis?No, the D201925 CPU requires a dedicated separate master rack slot position outside this 8-slot I/O subrack. This chassis only accepts D201xx series analog and digital field I/O cards; CPU hardware will not mechanically lock into standard I/O slots and cannot establish bus communication.