Custom Machine Management Software

Requirements for Developing 21 CFR Part 11 Compliant Software 1. Introduction This report outlines the technical, functional, and regulatory requirements for developing software that is compliant with 21 CFR Part 11, capable of communicating with a Programmable Logic Controller (PLC), displaying real-time process data, and controlling PLC operations. Such software is typically used in FDA-regulated industries including pharmaceuticals, biotechnology, medical devices, and food & beverage manufacturing. The goal is to ensure that the software meets data integrity, security, auditability, and electronic record/electronic signature (ER/ES) requirements while maintaining reliable and secure industrial control system integration. ________________________________________ 2. Overview of 21 CFR Part 11 21 CFR Part 11 is a U.S. FDA regulation that defines criteria under which electronic records and electronic signatures are considered trustworthy, reliable, and equivalent to paper records and handwritten signatures. Key principles include: • Data integrity (ALCOA+ principles) • Secure user authentication • Audit trails • System validation • Controlled access • Record retention and retrieval ________________________________________ 3. System Architecture Overview 3.1 High-Level Architecture The system typically consists of: • PLC Hardware (e.g., Siemens, Allen-Bradley, Schneider) • PLC Communication Layer (OPC UA, Modbus TCP, Ethernet/IP, Profinet, etc.) • SCADA / Custom Application Software • Application Server (business logic, audit trail, security) • Database Server (electronic records and audit logs) • Client Interface (HMI/Web/Desktop application) 3.2 Data Flow • PLC generates real-time process data • Software reads data continuously • Data is displayed to users in real time • Authorized users send control commands to PLC • All critical actions and data changes are recorded securely ________________________________________ 4. Functional Requirements 4.1 PLC Communication Requirements • Support for industrial communication protocols (OPC UA preferred due to security and compliance features) • Real-time data acquisition with configurable polling rates • Reliable command execution with confirmation from PLC • Fail-safe mechanisms for communication loss • Read/write access control at tag or function level 4.2 Real-Time Data Monitoring • Live visualization of PLC parameters (analog, digital, alarms) • Time-stamped data updates • Data buffering in case of temporary communication failure • Configurable trends and dashboards 4.3 PLC Control Functionality • Ability to start/stop processes • Parameter setpoint changes • Recipe or batch control (if applicable) • Interlocks and safety validation before command execution • Mandatory user authentication for control actions ________________________________________ 5. 21 CFR Part 11 Compliance Requirements 5.1 User Access and Security • Unique user ID for each individual • Role-based access control (RBAC) • Password policies (complexity, expiration, lockout) • Optional multi-factor authentication • Automatic session timeout 5.2 Electronic Records • Secure storage of all GMP-relevant data • Records must be accurate, complete, and protected from alteration • Time-stamped entries synchronized with a secure system clock • Data retention as per regulatory and business requirements 5.3 Audit Trail • Computer-generated, secure, time-stamped audit trails • Record creation, modification, and deletion events • Capture: o Who performed the action o What was changed o Old value and new value o Date and time o Reason for change (where applicable) • Audit trails must be non-editable and retained 5.4 Electronic Signatures • Support for electronic signatures linked to electronic records • Signature components: o User ID and password re-entry o Meaning of signature (approval, review, execution) o Date and time • Signatures must be permanently linked to the record ________________________________________ 6. Data Integrity (ALCOA+) The system must comply with ALCOA+ principles: • Attributable – Actions traceable to individuals • Legible – Human-readable records • Contemporaneous – Data recorded at the time of activity • Original – Source data preserved • Accurate – Error-free and validated • Complete, Consistent, Enduring, Available ________________________________________ 7. System Validation Requirements 7.1 Validation Lifecycle • User Requirements Specification (URS) • Functional Specification (FS) • Design Specification (DS) • Risk Assessment • Installation Qualification (IQ) • Operational Qualification (OQ) • Performance Qualification (PQ) 7.2 Validation Controls • Documented test cases • Change control procedures • Version control and release management • Validation of PLC-software interaction ________________________________________ 8. Infrastructure and Technical Requirements 8.1 Software Design • Modular and layered architecture • Secure APIs and services • Separation of GMP and non-GMP data 8.2 Database Requirements • Secure relational database (e.g., SQL Server, PostgreSQL) • Encryption at rest and in transit • Regular backups and restore verification • Restricted direct database access 8.3 Time Synchronization • Centralized time source (NTP) • Time-stamp consistency across PLC and software ________________________________________ 9. Cybersecurity Requirements • Secure PLC communication (certificates, encryption) • Network segmentation (IT/OT separation) • Firewall and access control rules • Event logging and intrusion detection • Compliance with IEC 62443 (recommended) ________________________________________ 10. Change Management and Maintenance • Formal change control process • Impact assessment for GMP relevance • Re-validation after significant changes • Periodic system review ________________________________________ 11. Regulatory and Documentation Requirements • SOPs for system use, security, backup, and recovery • Training records for users and administrators • Incident and deviation management • FDA inspection readiness documentation ________________________________________ 12. Other Requirements • Access of data also through cloud • A server / client based architecture • Software should connect with machine through a hardware id • Software should be computer specific (computer id must be integrated with the software at time of installation and access through cloud) • Warranty, installation date, machine manufacturing date, place of installation should be displayed in the software • ‘n’ number of machines should be connectable in groups (space/ area/ name / department specific) • Software should be accessible through our company website (In web based access) • Our software should be able to integrate with the buyer’s ERP system • Multi-lingual • Operatable on Windows/ MAC os/ Linux Conclusion Developing a software system that communicates with PLCs while complying with 21 CFR Part 11 requires a combination of robust industrial automation design, secure IT infrastructure, and strict regulatory controls. By implementing strong authentication, audit trails, validated processes, and secure PLC communication, the system can meet FDA expectations while enabling real-time monitoring and control of manufacturing operations.

Project ID: 40193184