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LOGO! Application for Speed-Based Relay Control

This outlines a solution for your application using a Siemens LOGO! PLC, based on hall effect sensor input (SP) and relay output (RL) control.

Functionality Summary:

• Startup: RL activates for 4-7 seconds.
• Speed > X for > 30s, then SP < X for > 5s: RL activates for 4-7 seconds.
• Speed > X for < 30s, SP < X: RL activates immediately for 4-7 seconds.

Implementation Approach:

This requires timers and comparison blocks within the LOGO! software. Here's a breakdown:

1. Startup Timer: Use a TON (Timer On Delay) to activate RL for 4-7 seconds at power-up.
2. Speed Comparison & Timers:
   • Compare SP to X using a comparison block.
   • Use two TON timers: one for SP > X (>= 30s) and one for SP < X (>= 5s).
   • Logic to trigger RL based on the timer states as per your requirements.
3. Short Duration Speed > X: Implement logic to activate RL immediately if SP > X for less than 30 seconds and SP < X.

Resources:

• LOGO! Soft Comfort Documentation: https://support.industry.siemens.com/cs/document/109753693
• LOGO! 8.3 Application Examples: https://support.industry.siemens.com/cs/document/109822863
• Siemens Industry Online Support: https://support.industry.siemens.com/

For detailed step-by-step programming guidance, consider consulting the LOGO! Soft Comfort help files or exploring available tutorials. You may also find pre-built example programs that can be adapted to your needs.