D201190 Metso AO4H 4×4–20 mA HART Output Module

Description

Product Model: D201190 (AO4H D201190)
Product Brand: Metso / Metso Automation
Product Family / Type: AO4H (Analog Output with HART) Module

Key Features (from supplier sources):

• Provides 4 analog output channels, each capable of 4–20 mA output.
• Supports HART communication overlay, enabling digital configuration, diagnostics, or feedback.
• Accepts supply voltage in the range 10–32 V DC (per one supplier listing) for powering the module and outputs.
• Offered in “Ver. G” revision in surplus and supplier inventories.

Role & System Fit

In a DCS or PLC-based control system, outputs to field actuators (valves, control devices) are often required to be analog 4–20 mA, and in modern setups many of those actuators or transducers support HART (Highway Addressable Remote Transducer) communication. A module like AO4H D201190 sits at this interface: it drives the analog outputs to field devices while also enabling bidirectional HART communication for configuration, diagnostics, and verification.

You would typically install AO4H D201190 into an I/O rack or base matching the Metso control architecture. The four outputs can be assigned to control loops, positioners, or actuators. Meanwhile, the HART overlay allows remote tuning, status reading, or error signaling back to the control system.

Because it uses standard 4–20 mA outputs, the module integrates easily into existing analog control wiring, but the added HART layer gives enhanced flexibility: you can monitor actuator health, detect wire breaks or device faults, or remotely calibrate without interrupting the analog control loop.

AO4H modules like D201190 are useful in retrofit or upgrade projects where you want to add more intelligence (HART capability) without re-wiring or replacing the entire control infrastructure.

Technical Features & Benefits

Output Channels & HART Communication

• Four analog outputs (channels) supporting the standard 4–20 mA range.
• HART support overlaid on the same 4–20 mA loops allows two-way communication with field devices: read diagnostics, configure parameters, detect faults, or fetch device metadata.
• Because HART signals ride on top of the analog current, the module must maintain loop integrity and linearity, ensuring that the analog control function is not compromised by the digital signaling.

Electrical Supply & Operating Range

• Supplier listings mention 10–32 V DC as acceptable supply voltage for the module.
• The module is marketed by VB Industrial Supply as “NEW Metso Automation AO4H D201190 Ver. G 4-Channel HART Output Module PLC.”
• Because it’s a surplus / NOS (new old stock) item in many listings, the internal tolerances, temperature drift, or internal design margins may vary depending on age and revision.

Limitations, Variants & Considerations

• The “Ver. G” revision is specifically mentioned in listings, which suggests there are earlier or later revisions.
• The lack of a full OEM datasheet in public sources means that details like output load capability, transient response, isolation, resolution, and HART timing behavior are not verified in my findings.
• Surplus listings show this module sells in industrial markets, including for replacement parts.

Thus, while the module gives you the needed dual analog + HART function, you should carefully validate that it meets your system’s electrical and timing requirements before full-scale deployment.

Technical Specifications Table

Here’s a compilation of known and inferred parameters for AO4H D201190. Use this as a reference pending confirmation from physical or OEM documentation:

Installation & Maintenance Insights

Here are practical tips and cautions when using AO4H D201190 modules in a real system:

Rack Insertion & Mechanical Considerations

• Ensure the module seats firmly into the backplane or base rack; poor contact may degrade analog or HART performance.
• Leave clearance and ventilation around the module; heat buildup may affect output stability or HART timing.
• Label carefully the revision (e.g. Ver. G) and connections, as mismatches might lead to functional issues.

Wiring, Loop Design & HART Communication

• Use twisted-pair, shielded cable for each analog output + HART loop, especially over long distances or in industrial environments.
• Terminate shields properly (typically at one end) to avoid ground loops that can corrupt the analog or HART signal.
• Maintain loop impedance and headroom so that the module can drive full 20 mA plus HART signaling reliably.
• Avoid excessive inductance or capacitance in loops (long wiring, many junctions), as that can degrade HART signal integrity.

Commissioning & Testing

• After wiring, step through each output channel with known output values (e.g. 4 mA, 12 mA, 20 mA) and validate in the control system.
• Use a HART communicator or upstream HART host to poll the field devices via the module, ensuring diagnostics, calibration, and reading works.
• Monitor output linearity, response to step changes, and note if the HART communication introduces delays or disturbance to analog control.
• Be sure any calibration or trim functions are stored, and backup your module configuration.

Spares & Lifecycle Strategy

• Because modules like AO4H D201190 are often supplied as new old stock (NOS) spares, keep at least one spare Ver. G (or matching revision) module on hand.
• Before installation into a live loop, test the spare module offline to verify outputs, linearity, and HART comms.
• Document the mapping of which physical output goes to which field device to simplify swap-out.

Fault Diagnosis

• If a loop fails (no current, stuck low/high, noisy reading, or HART communication failure), first inspect wiring, field device condition, and loop integrity before suspecting module fault.
• If multiple adjacent channels show error, suspect power supply, module internal fault, or backplane issue.
• Use diagnostics (if available) or HART device error codes to help isolate wiring vs module issues.