Description
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | D201466 |
| Module Designation | DII8P24 |
| Manufacturer | Metso |
| Product Family | ACN I/O M120 |
| Module Type | Digital input unit |
| Number of Channels | 8 |
| Input Signal Type | Positive logic (PNP) |
| Field Supply Voltage | 18–32 VDC |
| Channel-Specific Supply | 24 VDC nominal, current limited |
| Current Limit | 40 mA per channel |
| Input Impedance | 3.5 kΩ |
| Maximum Field Leakage Current | 1.5 mA |
| Input Filtering | 0.5 ms time constant |
| Measuring Interval | 1.0 ms |
| Pulse Counting Frequency | Below 400 Hz |
| Configurable Minimum Pulse Length | 1–500 ms |
| Configurable Pulse Hold Time | 0–1250 ms |
| Dimensions | 130 × 24 × 95 mm (H × W × D) |
| Weight | Approximately 110 g |
| Cross-Connection Board | IXR16, D201651 |
| Compatible Cable Families | S446497–S446503 and S446513–S446519 |
Specifications are based on the Metso ACN I/O M120 technical documentation. Confirm the exact revision and cabinet wiring arrangement before installation.
Product Introduction
Metso D201466 DII8P24 Digital Input Module
The Metso D201466, designated DII8P24, is an eight-channel digital input module in the ACN I/O M120 family. It reads positive-logic PNP signals from field contacts, proximity switches, and other compatible 24 VDC switching devices. Each channel has a current-limited field supply, allowing the module to support common two-wire and three-wire sensor arrangements.
D201466
For maintenance teams, the module provides configurable input filtering and pulse-counting operation, making it suitable for both discrete status monitoring and selected pulse-based signals. Its 1 ms measuring interval supports responsive signal acquisition, while the 40 mA channel-specific current limit must be considered when selecting connected sensors.
Application Scenarios & Field Pitfalls
The D201466 is intended for field signals that use positive-logic PNP switching. A common commissioning problem is confusing PNP sourcing signals with NPN sinking signals or connecting devices that require a different supply arrangement. Such mismatches can produce incorrect input states, persistent channel indications, or unreliable signal detection.
Typical applications
- Proximity sensor monitoring: Reads compatible PNP proximity switches for equipment position and movement feedback.
- Machine status acquisition: Monitors auxiliary contacts, operating states, and discrete equipment interlocks.
- Process equipment feedback: Collects limit-switch and valve-position signals for PLC or DCS logic.
- Pulse counting: Supports pulse-counting mode for compatible signals below 400 Hz, subject to configured pulse-width requirements.
Engineering checks before replacement
- Verify signal polarity. The DII8P24 is designed for positive-logic PNP inputs. Do not assume that an NPN sensor or dry-contact circuit can be connected without checking the wiring design.
- Check sensor current demand. The channel-specific supply is limited to 40 mA. Confirm that the connected field device remains within this limit, including startup or transient demand.
- Review pulse settings. The configurable minimum pulse length is 1–500 ms. A pulse-counting application may miss signals if the actual pulse width and configured parameters are incompatible.
- Confirm the cabinet connection. Metso documentation identifies the IXR16 D201651 cross-connection board for DII8P24. Check the installed board, cable family, terminal mapping, and cabinet drawings before moving field wiring.
Related Products
- D201467 – DII8P48: Eight-channel PNP digital input module with a 48 VDC channel supply. Consider it for 48 VDC field circuits; it is not a direct electrical substitute for the 24 VDC D201466.
- D201472 – AII8CN: Eight-channel isolated analog current input module for 0/4–20 mA signals. Used for continuous process measurements rather than discrete switching signals.
- D201473 – AII8C: Eight-channel analog current input module with channel-specific transmitter power. Check transmitter supply requirements before selecting it instead of AII8CN.
- D201474 – AII8V: Eight-channel analog voltage input module for 0/1–5 V signals. Intended for voltage measurement, not PNP digital input acquisition.
- D201475 – AII4H: Four-channel HART analog input unit. Relevant when the application requires HART communication with compatible field instruments.
- D201477 – AOI4C: Four-channel analog current output module for 0/4–20 mA control signals. It performs an output function, unlike the D201466 input module.
- D201651 – IXR16: Cross-connection board identified for the DII8P24 and other M120 modules. Verify the installed board and cable arrangement when replacing or expanding the I/O assembly.
Procurement note: Specify the complete designation Metso / , not just the part number. Before purchase, confirm the nameplate, hardware revision, connector condition, and compatibility with the installed ACN I/O M120 cabinet.
