Safety Interlocks

• When designing or implementing control logic for laboratory hardware, heating systems, or mechanical actuators.
• When establishing protective mechanisms to prevent system saturation or catastrophic equipment damage.
• When performing risk assessments and configuring automated safety monitoring for industrial processes.

Output

• Functional safety logic patterns and code snippets for interlock implementation.
• Configuration summaries for safety thresholds and emergency response behaviors.
• A checklist of precautions for pre-control sensor validation and safety event logging.

Pre-Control Checklist

Before starting any control operation:

1. Verify sensor reading is reasonable

   • Not NaN or infinite
   • Within physical bounds

2. Check initial conditions

   • Measurement should be at expected starting point
   • Output should start at safe value

3. Confirm safety limits are configured

   • Maximum limit threshold set
   • Output clamping enabled

Best Practices

1. Defense in depth: Multiple layers of protection
2. Fail safe: When in doubt, reduce output
3. Log everything: Record all safety events
4. Never bypass: Safety code should not be conditionally disabled
5. Test safety: Verify interlocks work before normal operation