Metso DNA AIH8 Modules: A413187 AIH8

Technical Dossier

Product Details And Specifications

Metso DNA AIH8 Series: Comprehensive Module Range and Technical Overview

The Metso DNA (Distributed Control System) platform — originally developed under the Neles Controls and later Valmet brand lineage — represents one of the most widely deployed process automation architectures in global heavy industry. The A413187 AIH8 8-Channel Analog Input Module is a core I/O component within this ecosystem, installed across continuous-process industries including petroleum refining, pulp and paper mills, chemical processing plants, nuclear power generation facilities, and offshore oil and gas platforms. The DNA system's modular backplane architecture allows the AIH8 to interface directly with field transmitters (4–20 mA, HART-compatible), providing high-resolution analog signal acquisition with galvanic isolation per channel. Its deployment density in brownfield plants — many of which have operated the DNA platform for 15–25 years — makes the A413187 AIH8 one of the most consistently demanded spare parts in the Metso ecosystem globally.

The Evolution of DNA AIH8 Architecture

The Metso DNA control system evolved through several distinct hardware generations. The earliest deployments (mid-1990s) used the Damatic XD platform, which established the modular I/O philosophy later refined in the DNA series. The transition to the DNA architecture (early 2000s) introduced standardized backplane bus communication, enabling hot-swap capability and online diagnostics — features that became critical for continuous-process plants with zero-downtime requirements.

The AIH8 module family specifically addressed the need for high-channel-density analog acquisition within a single slot. Early revisions used 12-bit ADC resolution; later hardware revisions (identifiable by PCB revision markings) upgraded to 16-bit resolution, improving measurement accuracy for precision flow and pressure loops. The A413187 designation covers the primary production variant of the AIH8, with sub-variants differentiated by firmware revision and backplane connector generation. Compatibility between hardware revisions requires verification against the DNA system's I/O configuration database — cross-generation substitution without firmware alignment can cause channel offset errors.

As the DNA platform has entered its mature/end-of-active-production phase, Metso (now Valmet) has shifted support to the DNA Next generation. However, the installed base of legacy DNA hardware remains extensive, and OEM spare part availability has declined significantly since 2018. Third-party MRO suppliers and certified refurbishers have become the primary sourcing channel for modules including the A413187 AIH8.

Metso DNA Full Catalog & Functionalities — AIH8 Series SKU List

Analog Input Modules (AI)

• A413187 AIH8: 8-channel analog input, 4–20 mA, HART-compatible, galvanic isolation per channel
• A413188 AIH8: 8-channel analog input, high-accuracy variant, 16-bit ADC resolution
• A413100 AI8: 8-channel standard analog input module, non-HART, 12-bit resolution
• A413101 AI16: 16-channel analog input module, multiplexed acquisition, 4–20 mA
• A413102 AITC8: 8-channel thermocouple input module, multi-type (J, K, T, E, R, S, B)
• A413103 AIRTD8: 8-channel RTD input module, PT100/PT1000, 3-wire and 4-wire

Analog Output Modules (AO)

• A413200 AO8: 8-channel analog output, 4–20 mA, loop-powered, short-circuit protected
• A413201 AOH8: 8-channel analog output, HART pass-through, 16-bit DAC resolution

Digital Input Modules (DI)

• A413300 DI16: 16-channel digital input, 24 VDC, optically isolated, status LED per channel
• A413301 DI32: 32-channel digital input, high-density, 24 VDC, group isolation
• A413302 DIAG16: 16-channel digital input with diagnostics, line-fault detection

Digital Output Modules (DO)

• A413400 DO16: 16-channel digital output, 24 VDC, 0.5 A per channel, short-circuit protection
• A413401 DO8R: 8-channel relay output module, SPDT contacts, 2 A at 250 VAC

CPU / Controller Modules

• A413000 ACN: Application Controller Node, dual-redundancy capable, Ethernet backplane
• A413001 ACN-R: Redundant Application Controller Node, hot-standby, bumpless transfer

Communication & Network Modules

• A413500 FBM: FOUNDATION Fieldbus Module, H1 segment, 16-device capacity
• A413501 PBM: PROFIBUS DP Master Module, 12 Mbit/s, 126-node support

Power Supply Modules

• A413600 PSU24: 24 VDC backplane power supply, 10 A output, redundancy-ready
• A413601 PSU-R: Redundant power supply module, automatic failover, status relay output

Sourcing Hard-to-Find & Obsolete DNA AIH8 Parts

DriveKNMS maintains a dedicated inventory program for Metso DNA legacy modules, with specific focus on the A413187 AIH8 and related I/O hardware. As OEM production of these modules has ceased or been significantly curtailed, the primary sourcing channels are decommissioned plant equipment, certified refurbishment programs, and cross-regional surplus inventory networks.

Quality Control for the DNA AIH8 Range

The A413187 AIH8 module presents specific test challenges due to its multi-channel analog acquisition architecture and HART communication overlay. DriveKNMS applies the following test protocol to all DNA AIH8 units prior to shipment:

• Backplane bus continuity test: Verification of all backplane connector pins against Metso DNA slot specification, including power rails (5 VDC, 24 VDC) and communication bus lines.
• Per-channel analog accuracy test: Each of the 8 input channels is stimulated with calibrated 4 mA, 12 mA, and 20 mA reference signals. Measured values are compared against the module's specified accuracy (±0.1% of full scale for production-grade units).
• Galvanic isolation verification: Channel-to-channel and channel-to-backplane isolation resistance is measured at 500 VDC. Minimum acceptable value: 100 MΩ.
• HART communication test: HART protocol overlay is verified on all channels using a HART communicator, confirming correct FSK modulation and device variable response.
• Thermal cycling: Units are cycled between 0°C and 60°C operating range to identify latent solder joint or component failures consistent with field-aged hardware.
• Firmware revision logging: PCB revision and firmware version are recorded and disclosed to the customer prior to shipment to enable compatibility verification against the target DNA system configuration.