Building BIOS Architecture

Audit and Engineering Logs provide a durable record of actions, decisions, changes, observations, and evidence affecting the building.

Audit Logs shall record:

authentication attempts;

authorization decisions;

configuration access;

commands;

overrides;

policy changes;

software updates;

credential changes;

remote access;

security incidents;

administrative actions.

Engineering Logs shall record:

commissioning;

configuration changes;

compatibility decisions;

inspection;

maintenance;

faults;

repairs;

test results;

capacity restrictions;

Interface connection and disconnection;

Profile changes;

engineering approvals.

Each log entry shall include:

unique record identity;

timestamp;

actor;

action;

affected entity;

previous and resulting condition;

reason;

authorization;

configuration version;

evidence reference;

outcome.

Logs shall be append-only after acceptance. Corrections shall reference the original entry and preserve both records.

Retention requirements shall reflect safety, regulatory, lifecycle, warranty, security, and engineering needs.

Access shall be role-controlled. Privacy-sensitive information shall be separated or minimized while preserving necessary engineering accountability.

The BIOS shall support export in a documented format so that lifecycle history is not trapped within one vendor platform.

Clock uncertainty, offline entry, delayed synchronization, and imported historical records shall be identified explicitly.