====================================================================== ROC Human-Machine Interface (HMI) Ergonomic Certification Checklist ====================================================================== DEFINITION ---------------------------------------- The ROC Human-Machine Interface (HMI) Ergonomic Certification Checklist is a standardized, auditable evaluation framework used to verify that the HMI systems deployed in Mine Remote Operations Centers meet internationally recognized ergonomic, usability, and safety requirements for sustained operator performance. It ensures that visual displays, control layouts, interaction modalities, and environmental integration support cognitive load management, error prevention, and physical well-being during extended remote monitoring and intervention tasks. Certification against this checklist is typically required prior to operational commissioning of ROC facilities. OVERVIEW ---------------------------------------- The ROC HMI Ergonomic Certification Checklist addresses the unique human factors challenges inherent in mining remote operations—where operators monitor and control geographically dispersed assets from centralized control rooms for up to 12-hour shifts. It integrates principles from ISO 9241 (Ergonomics of Human-System Interaction), ISO 11064 (Ergonomic Design of Control Centres), and MSHA/NIOSH guidance on fatigue risk management, emphasizing visual ergonomics (e.g., display luminance contrast, font scalability, information hierarchy), spatial layout (e.g., optimal viewing angles, reach envelopes for controls, workstation adjustability), and interaction design (e.g., consistent navigation, feedback latency thresholds <150ms, alarm prioritization per EEMUA 191). The checklist also mandates validation through simulated operational scenarios—including high-stress fault recovery drills—to assess real-time HMI responsiveness, mental workload (measured via NASA-TLX or eye-tracking metrics), and posture-related musculoskeletal risk (using RULA/REBA scoring). Compliance is verified via multidisciplinary audit teams comprising certified ergonomists, HMI software engineers, occupational health specialists, and experienced ROC operators—ensuring both technical adherence and experiential relevance. KEY COMPONENTS ---------------------------------------- 1. Visual Display Ergonomics 2. Control Layout & Accessibility 3. Interaction Feedback & Response Time APPLICATIONS ---------------------------------------- - Pre-commissioning ROC facility certification - HMI software version upgrade validation - Periodic ergonomic recertification (biannual or post-incident review) KEY FORMULAS ---------------------------------------- Minimum Luminance Contrast Ratio: CR = (L1 + 0.05) / (L2 + 0.05) -> Calculates contrast ratio between text/object (L1) and background (L2) luminance in cd/m²; must be ≥ 4.5:1 for normal text per ISO 9241-3 Maximum Permissible Input Latency: Latency ≤ 150 ms -> End-to-end system response time threshold for critical control actions to prevent operator-induced errors due to temporal disorientation NASA-TLX Weighted Workload Score: TLX = Σ(w_i × r_i) / Σw_i -> Composite score (0–100) derived from six subjective dimensions (mental demand, physical demand, etc.), each rated 0–100 and weighted; scores >65 indicate excessive cognitive load requiring HMI redesign RELATED CONCEPTS ---------------------------------------- - ISO 9241-110 (Interaction Principles) - Remote Operations Center (ROC) Design Standards - Cognitive Load Theory REFERENCES ---------------------------------------- ISO 9241-110:2020 Ergonomics of human-system interaction — Part 110: Interaction principles (https://www.iso.org/standard/77520.html) ISO 11064-1:2000 Ergonomic design of control centres — Part 1: Principles for the design of control centres (https://www.iso.org/standard/25856.html) EEMUA Publication 191: Alarm Systems – A Guide to Design, Management and Procurement (https://www.eemua.org/publications/eemua-publication-191-alarm-systems/) TAGS ---------------------------------------- mining, human factors, remote operations, ergonomics, HMI design