【2026 Interlocking Systems】 6 Common Types of Equipment Interlocking
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1. Activate interlock 🚦 Core logic: All conditions must be met before the device can be started; otherwise, the permission to start is \"locked out\". ✅ Typical scenarios: Startup of a large motor → Lubricant pressure must be at the required level✅ Startup of the mixing agitator in a reactor → The reactor cover must be properly sealed✅ Startup of a conveyor belt → Downstream equipment is already in operation✅
2. Operate interlock ⚠️ Core logic: Monitor in real time during operation; stop immediately in case of any anomaly! 🔥 Frequent occurrence: When the machine tool protection door is opened → the spindle stops instantly! Too low pressure at the pump inlet → Automatic pump shutdown to prevent damage; Excessive temperature and pressure in the reactor → Emergency shutdown of feed supply
3. Stop interlocking ⏳ Core logic: Shutdown is not the end; a safe conclusion is what matters! 🔧 Standard procedure: When the host is shut down, the cooling water pump shuts off after a delay (e.g., after 5 minutes of continuous operation). In case of an emergency shutdown, all equipment along the line applies segmented braking to prevent material blockages
4. Sequential interlock ▶️ Core logic: Equipment startup and shutdown must occur in order; any out-of-order operation is strictly prohibited! 📦 Scenario replication: The material conveying system must: ① Start the downstream equipment first → ② Then start the upstream equipment. ⛔ Skip a step? The system locks up immediately!
5. Interlock (competitive interlocking) ⚔️ Core logic: Only one of the two can exist, like a safety \"life-or-death\" situation! 💡 Typical examples: Dual-power switching: Main power supply in operation ⚡️ → Backup power supply is forcibly disconnected. Valve control: Valve A opens → Valve B closes automatically
6. Emergency Shutdown (ESD) 🚨 Core logic: The highest level of alarm! Unconditional emergency stop across the entire line! ⚠️ Trigger conditions: Fire detection alarm 🔥 | Gas leak ⚠️ | People entering a dangerous area → All power sources are cut off within 0.1 seconds
Key summary: Safety rigid constraints: Interlocking acts as a \"mandatory insurance\" to bypass manual operation, eliminating the risk of errors.
Process automation assurance: Ensures that equipment operates in coordination according to process logic, thereby improving efficiency and stability.
Layered fault protection: A failure in a single device can have its impact limited through interlocks (e.g., if a pump stops, the upstream valve closes automatically).
Equipment interlock = Equipping machines with a \"rule-based brain\" to prevent incorrect operations❌ to stop dangerous situations from arising🔥 and to ensure the safety of both humans and machines🛡️