Never Override HMI Control Panels During GMP Manufacturing Runs

Do Not Override HMI Panels During GMP Production Runs

Remember: Never override HMI (Human-Machine Interface) settings during active manufacturing — unauthorized changes compromise validated parameters and GMP compliance.

Why This Matters in GMP

HMI panels serve as the interface for monitoring and controlling manufacturing systems such as blending machines, granulators, autoclaves, and packaging lines. These systems operate within validated parameters, and any manual override or unauthorized adjustment may result in deviation from the validated state. Such actions, even if well-intentioned, can result in product quality failure, process inconsistencies, and loss of batch integrity.

For instance, adjusting temperature setpoints or stopping alarms via the HMI to expe a process can alter dissolution characteristics or create unrecorded events. In GMP operations, every control system action must be traceable, justified, and controlled via change control or deviation procedures. Direct overrides not only violate this but also interfere with audit trails and electronic data integrity.

Also Read: Never Permit Shift Handover Without Logging Critical GMP Updates

Regulatory and Compliance Implications

21 CFR Part 211.68 requires automated systems to be validated and changes controlled. EU GMP Annex 11 mandates access restrictions and audit trails for electronic systems. WHO GMP also stresses that all parameter changes must be recorded, justified, and authorized. HMI

overrides are often flagged as critical data integrity and process control issues during inspections.

Regulators examine audit trail logs, access control lists, and deviation investigations for evidence of unauthorized system interactions. Findings include “unauthorized parameter adjustment,” “lack of control over electronic data,” or “absence of change control for HMI override.” These violations can lead to warning letters or product recalls if linked to batch failures.

Also Read: Don’t Discard QC Samples Without Prior QA Clearance in GMP

Implementation Best Practices

Restrict access to HMI panels using role-based permissions and electronic passwords. Configure systems to log every adjustment with time stamps and user identification. Prohibit any manual override of critical process parameters during manufacturing through SOPs and system design controls. Set alarms and interlocks to prevent override-based process continuation.

Train operators and supervisors on the risks and regulatory implications of unauthorized system access. Include HMI control adherence in deviation audits and data integrity assessments. Implement regular reviews of system audit trails and conduct exception trend analysis for potential system misuse.

Regulatory References

– 21 CFR Part 211.68 – Automated equipment and control systems
– EU GMP Annex 11 – Computerized systems and access control
– WHO TRS 1019, Annex 3 – Equipment and electronic data integrity
– MHRA GxP Data Integrity Guidance – Electronic systems and audit trails

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