Process Data Communications with the Antaris FT-NIR Analyzers – Analog, Digital, OPC and LIMS

Significance of the Topic

The integration of process analytical technology into manufacturing lines is critical for robust process control, real-time quality assurance, and efficient scale-up. Fourier-transform near-infrared (FT-NIR) spectroscopy is increasingly adopted for online measurements because it provides rapid, non-destructive molecular information relevant to concentration, moisture, and physical-state monitoring. Reliable communication of FT-NIR results to control systems, historians, and laboratory information systems is essential to convert spectral information into actionable control decisions and archived records.

Objectives and Overview of the Article

This technical note describes how Thermo Scientific Antaris FT-NIR process analyzers (Antaris EX and MX) communicate with plant control and information systems using analog I/O, digital I/O, OPC, and LIMS interfaces mediated by RESULT software. The aim is to outline available communication pathways, demonstrate workflow-based implementation for bi-directional integration, and show how chemometric results and pass/fail logic are exported to PLCs, OPC clients, and LIMS without deep programming effort.

Methodology and Workflow Implementation

The workbench for testing was the Antaris MX and EX analyzers connected to an Ethernet-linked programmable logic controller (PLC) using the Antaris Process Communication Controller configured with appropriate analog and digital modules. RESULT software functions as the orchestration layer: it operates as an OPC server, executes customizable electronic workflows composed of events, and provides dedicated events for "Report to OPC", "Write to IO", "Read from IO", "Report" (or "Report to Text"), and "Request" for LIMS interactions. Typical workflow steps include spectral acquisition via fiber-optic probes, chemometric quantification (PLS or other models), logical checks (PASS/FAIL), and reporting of numerical or binary outcomes to the selected client or controller.

Instrumentation Used

• Antaris EX and Antaris MX FT-NIR process analyzers (Thermo Scientific)
• Antaris Process Communication Controller (Ethernet-connected PLC interface developed for use with RESULT)
• RESULT software (Thermo Scientific) acting as OPC server and workflow engine
• Standard Ethernet network infrastructure and DCOM for OPC client/server communication
• Optional LIMS or data historian systems consuming text or HTML reports

Main Results and Discussion

The article explains practical implementations rather than reporting experimental analytical results. Key outcomes and functional capabilities are:

• OPC integration: RESULT acts as an OPC server enabling client computers to receive numeric measurements, chemometric outputs, and logical events. The "Report to OPC" workflow event publishes selected measurement values automatically to OPC clients, enabling remote or centralized process control and monitoring over existing Ethernet networks.
• Analog and digital I/O: The Antaris Process Communication Controller maps RESULT workflow outputs to physical channels. "Write to IO" events send continuous values (e.g., 4–20 mA concentration signals) to analog gauges or PLC inputs; digital channels convey binary status such as PASS/FAIL, alarms, or solenoid control signals.
• LIMS connectivity: RESULT produces human- or machine-readable outputs (HTML or delimited text) via "Report" or "Report to Text" events for automated ingestion by LIMS. The "Request" event enables two-way interactions by reading identifiers or sample requests from files supplied by LIMS.
• Workflow automation: RESULT workflows standardize acquisition, chemometric evaluation, decision logic, and reporting. Workflows can be configured to accept remote commands from OPC clients, enabling true two-way communication and centralized orchestration.

These mechanisms reduce custom programming needs, allow legacy and modern systems to interoperate, and keep spectral processing close to the analyzer while exporting only actionable outputs to process systems.

Benefits and Practical Applications

The presented integration approach yields multiple practical advantages for process analytical implementations:

• Minimal programming: Workflow events encapsulate common communication needs, lowering implementation effort for QA/QC and process control teams.
• Real-time control: Rapid reporting of chemometric results enables feed-forward and feedback strategies (e.g., automated valve adjustments, endpoint detection, or automated alarms).
• Flexible interfacing: Support for OPC, analog/digital I/O, and text/HTML reporting enables connectivity to PLCs, DCS, LIMS, and historians across legacy and modern infrastructures.
• Standardized, reproducible operations: Centralized RESULT workflows enforce consistent acquisition and decision logic, reducing operator variability.
• Traceability and archival: Report outputs can be routed to LIMS or historians for long-term storage and investigative analytics.

Common use cases cited include reaction-endpoint monitoring in chemical production, polymer QA/QC, and moisture content control in pharmaceutical solid dosage forms.

Future Trends and Potential Applications

Several directions expand on the documented capabilities:

• Tighter integration with advanced data platforms: Native connectors to modern data lakes, cloud historians, or IIoT platforms could reduce reliance on intermediary file formats and support higher-volume analytics.
• Edge analytics and model lifecycle management: Deploying model updates, automated validation, and drift detection at the analyzer edge can improve long-term performance of chemometric models without disrupting process communications.
• Standardized semantic layers: Adoption of higher-level semantics (e.g., OPC UA information models) will further simplify integration across vendors and support richer metadata exchange.
• Cybersecurity and secure remote access: As Ethernet and remote XML-based access become commonplace, hardened authentication, encryption, and secure gateway patterns will be essential.
• Expanded two-way automation: More sophisticated two-way workflows could enable dynamic model selection, on-demand re-calibration, or automated sampling strategies driven by process analytics.

Conclusion

RESULT software combined with Antaris FT-NIR analyzers provides a practical, workflow-driven framework to bring spectroscopic measurements into plant control and information systems. By supporting OPC, analog and digital I/O, and LIMS-compatible reporting, the solution minimizes custom coding while enabling real-time control, data archiving, and reproducible process analytics. These integration patterns facilitate broad industrial adoption of FT-NIR for in-line monitoring, process control, and quality management.