standby time

**Standby time** is the **intentional low-power or reduced-activity tool state entered during extended inactivity to save utilities and reduce wear** - it balances energy efficiency against restart delay and warm-up requirements. **What Is Standby time?** - **Definition**: Controlled equipment mode with selected subsystems throttled or paused when immediate production is not expected. - **Typical Actions**: Lower heater setpoints, reduced gas flows, pump speed changes, and motion-system idle states. - **Entry Criteria**: Triggered by planned idle duration thresholds and production forecasts. - **Exit Requirement**: Tool must complete warm-up and readiness checks before resuming product runs. **Why Standby time Matters** - **Energy Savings**: Reduces utility cost during low-load periods. - **Equipment Protection**: Can lower continuous stress on selected components. - **Throughput Tradeoff**: Excessive standby transitions may increase startup delay. - **Planning Dependence**: Effective standby policy requires accurate demand and queue visibility. - **Sustainability Value**: Supports fab energy and emissions reduction goals. **How It Is Used in Practice** - **Policy Thresholds**: Define minimum idle duration before entering standby mode. - **Restart Standard**: Enforce deterministic wake-up sequence and qualification checks. - **Policy Optimization**: Tune standby strategy using energy savings versus lost readiness time. Standby time is **an important operations-control state for energy-aware manufacturing** - optimized standby policies reduce cost while preserving acceptable production responsiveness.