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Alternating Pump Control in LOGO! Soft Comfort

Here's how to implement alternating pump control in LOGO! Soft Comfort. The core idea uses a Flip-Flop (SR latch) to toggle between pumps on each demand signal.

Logic Explanation:

1. Demand Signal: An input signal triggering a pump start request.
2. Flip-Flop: Implemented using Setand Resetcoils. The 'S' coil activates Pump 1, and the 'R' coil activates Pump 2.
3. Alternation: Each time the demand signal is active, the Flip-Flop toggles. This means if Pump 1 was on, the next demand activates Pump 2, and vice-versa.

Implementation Steps in LOGO! Soft Comfort:

1. Create two network outputs for Pump 1 and Pump 2.
2. Use an input as the 'Demand' signal.
3. Implement the Flip-Flop logic: Connect the 'Demand' signal to both the 'Set' coil for Pump 1 *and* the 'Reset' coil for Pump 2, and vice versa. This ensures mutual exclusion and alternation.
4. Consider adding interlocks (e.g., manual override, fault detection) for robust operation.

Example Resources:

• Siemens Support Forum: https://support.industry.siemens.com/sf/en/forum/ (Search for "LOGO! pump alternation")
• LOGO! Soft Comfort Help: Access detailed function block information within the software itself.

For detailed step-by-step guides and example programs, please refer to the Siemens documentation and online resources.