Technical Specifications (DNA DI Module):
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Model Number: D201925
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Number of Channels: 32 channels (grouped in banks of 8); some site configurations list as 16-channel variant — verify by I/O list
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Input Type: Dry contact or 24 V DC PNP/NPN (sourcing or sinking, software-configurable per bank)
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Rated Input Voltage: 24 V DC nominal (operating range 15–30 V DC)
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ON-state Voltage Threshold: 18–30 V DC (typ. 18 V); OFF-state < 5 V DC
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Input Current: ≈ 3.5–7 mA per channel @ 24 V DC
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Isolation: 500 V AC / 500 V RMS galvanic isolation (field-to-backplane); channel groups share common return but are isolated from system side
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Input Filter / Debounce Time: Software-configurable 1–100 ms (typical default 3–10 ms)
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Scan / Update Time: < 10 ms (typical)
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Power Supply: Derived from DNA backplane (+5 V / +24 V internal bus); no external power terminal
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Power Consumption: ≈ 1.5–2.5 W (typical for fully loaded 32-channel module)
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Status Indication: Individual green LED per channel (ON = lit); red/green bi-color for module health (Power OK / Comm Error / Config Mismatch)
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Hot-Swap: Supported — module can be inserted/removed with system live (requires DNA rack firmware support)
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Mechanical / Mounting: Plugs into Metso DNA I/O base unit (D2000-series rack); 35 mm DIN rail mount for distributed remote I/O stations
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Operating Temperature: –20 °C to +60 °C (–4 °F to +140 °F)
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Storage Temperature: –40 °C to +85 °C
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Protection Rating: IP20 (designed for installation inside enclosed control cabinet)
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Certifications: CE, UL 61010-1, CSA C22.2 No. 61010-1, IEC 61000-6-2 / IEC 61000-6-4(EMC)
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Diagnostics: Open-wire detection (on selected firmwares), channel-level status, module temperature monitor, communication heartbeat to controller
Applications (DNA DI Module):
Mineral processing plants — crusher cavity level switches, conveyor belt pull-cord / misalignment switches, pump run status; power — turbine trip contact monitoring, fan bearing temp switch; pulp & paper — press roll nip guard interlocks, broke pulper level switches; chemical — batch reactor agitator ON/OFF feedback, ESD valve limit switch monitoring.
General Installation & Usage Notes (Positioners & DNA Modules):
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Positioner Mounting: Install on actuator yoke per VDI/VDE 3845 (NAMUR) or using Metso/Neles dedicated bracket. Ensure feedback linkage is rigid and correctly phased (CW/CCW matches valve action).
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Air Supply to Positioner: Use instrument-grade filtered & regulated air (≤ 40 µm, oil-free, dew point min. 10 °C below lowest ambient). Fit a 3-way isolation valve upstream for maintenance.
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Wiring: Shielded twisted-pair for 4–20 mA; ground shield at DCS/panel end only. Verify loop polarity. Ensure ≥ 250 Ω resistance in HART loop for digital communication.
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Calibration: After mechanical installation perform auto-calibration (zero + full stroke + direction detect) via local buttons or HART communicator — this optimizes deadband and gain.
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Hazardous Area: Confirm Ex-certification label matches plant zone classification before energizing.
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DNA Module Handling: Insert/remove only with system de-energized unless hot-swap is confirmed enabled. Verify backplane connectors are clean. Download configuration from controller or restore from saved file after replacement.
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Safety: Before removing a positioner from a live loop confirm the valve can safely assume its fail-safe position. For SIL-rated loops follow the proof-test interval defined in the Safety Requirements Specification (SRS).
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