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Alternating Pump Control Logic (FBD)

Here's a basic FBD approach for alternating between two pumps to equalize wear, triggered by a single start/timeout input. This solution utilizes timers and logic gates within Siemens TIA Portal.

Logic Overview:

1. Input Signal: A digital input signal initiates the pump alternation sequence.
2. Timers: Two timers (e.g., TON - Timer On Delay) are used, one for each pump's run time.
3. Flip-Flop (SR or RS): A set-reset flip-flop determines which pump is active. The input signal sets the flip-flop, activating the first pump.
4. Pump Control Outputs: The flip-flop outputs directly control the two pumps.
5. Timer Reset & Alternation: When a timer completes, it resets the flip-flop, switching control to the other pump and starting its timer.

FBD Implementation Considerations:

• Adjustable Timers: Use parameterizable timer blocks to easily adjust pump run times.
• Safety Interlocks: Always include appropriate safety interlocks (e.g., level sensors, pressure switches) in your actual implementation.
• Error Handling: Implement logic to handle potential errors (e.g., pump failure).

Resources:

• Siemens Support Article: Alternating Pumps with S7-1500
• TIA Portal Documentation: TIA Portal Help (search for "Timer" and "Flip-Flop")

For detailed programming examples and specific configuration assistance, please refer to the Siemens documentation and support resources linked above. You may also find helpful application examples on the Siemens Industry Online Support website.