Interlock Module

Source: docs.foxbms.org — Interlock Files: src/app/driver/interlock/interlock.c, interlock.h

How It Works

External safety circuit with monitor current: - BMS-Master supplies low-power current through interlock connector - External loop passes through emergency stop switches - Low-side current sense: 0-100mA → 0-4V (linear) - Threshold comparator: pin goes low when current > 10mA

Feedback Checking

• Pin LOW = interlock closed (normal)
• Pin HIGH = interlock open (fault condition)
• State machine monitors feedback, reports to DIAG on unexpected open

Configuration

BS_IGNORE_INTERLOCK_FEEDBACK — disables feedback checking (removes safety detection).

POSIX Port Status

Interlock hardcoded always-closed (GA-23). Cannot simulate interlock-break → safe-state transition. Phase 3 work: add interlock override via SIL command (0x7E0).