Metso D201189 | AI8H 8-Channel Analog Input Module

Description

Core Product Summary

The Metso D201189 is an AI8H 8-channel HART analog input module used in Metso Automation (now Valmet) MasterPiece DCS I/O systems. It acquires continuous analog measurement signals from field transmitters — 0/4–20 mA current or 0/2–10 V voltage inputs — and converts them to digital values with a 16-bit A/D resolution per channel for delivery to the controller.

The “H” in AI8H denotes HART capability: the module supports the HART communication protocol alongside the analog measurement, enabling smart-transmitter configuration and device diagnostics over the same wiring, not just signal collection. The board also provides a 24 Vdc transmitter power supply output, current-limited to 30 mA, so two-wire field devices can be loop-powered directly from the module. Its analog front end includes a 3 dB low-pass filter with a 20 Hz corner frequency plus parametrizable software filtering. The module belongs to the Metso D-series I/O family alongside boards such as the D201190 AO4H HART analog output module and the D201134 AI8 analog input board, and an L-suffixed variant (D201189L) exists — so the revision marking on the original board should be confirmed before ordering a replacement.

Key Technical Specifications

Engineering Selection Highlights

• HART capability distinguishes this from the plain AI8 board: The AI8H reads the 4–20 mA analog signal and the HART digital data stream simultaneously, so plants using smart transmitters can access device diagnostics, tag/configuration data, and secondary variables without separate HART multiplexers.
• 16-bit resolution per channel: Higher resolution than typical 12-bit analog boards in this platform family; it matters where small process changes must register reliably in the controller’s measurement database.
• Integrated loop power, 24 Vdc at 30 mA limit: Two-wire transmitters can be powered directly from the module, eliminating external loop power supplies — but the 30 mA current limit constrains loop load, so verify transmitter loop burden before wiring.
• Dual-mode input, mA or V: Channel electronics accept 0/4–20 mA or 0/2–10 V signals, making the board usable in mixed instrumentation cabinets, though channel-level range configuration must match the I/O database.
• Defined filtering behavior: A fixed 20 Hz analog filter plus parametrizable software filtering addresses RF and process noise; the software filter setting should be recorded as part of the loop configuration when replacing boards.
• Paired HART output board: The D201190 AO4H is the companion HART analog output module in the same family; sites using HART on both measurement and command loops typically stock both.
• Revision check: An L-suffixed variant (D201189L) circulates in the spare market. Match the revision marking on the original board’s label before ordering.

D201189

D201189

Detailed Product Overview

The D201189 is the HART-capable member of Metso’s 8-channel analog input board line, and the distinction it carries over the standard AI8 board is worth stating precisely. A conventional analog input board measures the loop current and stops there. The AI8H additionally participates in the HART protocol superimposed on the same 4–20 mA loop, which means configuration data, device identification, diagnostics, and secondary variables from a smart transmitter become available to the DCS without any additional field wiring or external HART modems. For plants that maintain asset-management programs, this is the difference between a transmitter being just a signal source and being an addressable, diagnosable field device.

The measurement path itself is specified in some detail. Each of the eight channels accepts either current (0/4–20 mA) or voltage (0/2–10 V) signals and converts them at 16-bit resolution. The front end includes a fixed analog low-pass filter with a 3 dB corner at 20 Hz — a radio-frequency suppression measure — followed by parametrizable software filtering that the application engineer sets per the loop’s noise characteristics. When a board is replaced, the software filter settings belong to the loop configuration and should be restored or verified as part of the change record.

Loop power is integrated: the module supplies 24 Vdc, current-limited to 30 mA, sufficient for most two-wire transmitters but tight enough that high-burden loops — long cable runs plus barriers plus transmitter minimum voltage — should be checked. The current limit itself is a protective feature, restricting fault energy on a shorted loop.

In the rack, the board belongs to the MasterPiece 2001 DCS I/O structure, alongside its family counterparts: the D201134 AI8 non-HART analog input, the D201136 AO4C analog output, and the D201190 AO4H HART analog output. As with the rest of this family, procurement discipline matters most: an L-suffixed variant (D201189L) exists, board functions in this series are sometimes misdescribed in third-party listings, and the authoritative identification is always the original board’s own label — order number, module type (AI8H), and revision marking — read in the rack and matched exactly.

System Compatibility & Integration Requirements

Applications & System Role

In a Metso/Valmet MasterPiece control architecture, the D201189 sits on the measurement side of the control loop: it is the interface through which process variables — flow, pressure, level, temperature, and analytical transmitter signals — enter the DCS as conditioned digital values. Its engineering role is analog signal acquisition with an added smart-device layer: because it speaks HART, the same board that feeds a flow value to the controller can also expose the transmitter’s diagnostic status and configuration.

Typical fit scenarios follow directly from this function. Plants operating MasterPiece 2001 systems in process industries use AI8H boards to populate analog input slots in I/O racks, replacing failed boards to restore measurement availability, or to extend I/O capacity during cabinet expansion. Where a plant has standardized on HART-capable smart transmitters, the AI8H board is the board type that lets those devices be interrogated from the control system, supporting asset-management workflows alongside normal control.

FAQ

What is the Metso D201189?
It is an AI8H 8-channel HART analog input module for Metso/Valmet MasterPiece DCS I/O systems.

What signal types does it measure?
Eight channels of 0/4–20 mA current or 0/2–10 V voltage analog signals, each with 16-bit A/D resolution.

What does the “H” in AI8H mean?
It indicates HART protocol capability — the module communicates digitally with HART smart transmitters over the same loop wiring used for the analog measurement.

Does the module power field transmitters?
Yes, it provides a 24 Vdc transmitter power supply output, current-limited to 30 mA, allowing two-wire transmitters to be loop-powered directly.

What filtering does it provide?
A fixed analog RF low-pass filter with a 3 dB corner at 20 Hz, plus parametrizable software filtering for process noise.

Is there an L revision of this module?
Yes, a D201189L variant is documented in the spare market. Match the revision marking on the original board before ordering a replacement.

Which boards belong to the same family?
The D201134 (AI8 analog input), D201136 (AO4C analog output), and D201190 (AO4H HART analog output) are the related boards in the same Metso I/O family.

Where is it used?
In analog input slots of Metso/Valmet MasterPiece 2001 DCS I/O racks, acquiring process measurements and supporting HART smart-transmitter diagnostics.