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Tech Tip Siemens 3-point Stepper Control

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Tech Tip  Siemens 3-point Stepper Control

Tech Tip Siemens 3-point Stepper Control

3-Point Stepper Control with SIMATIC S7-1200
For products: 6ES7211-1AD30-0XB0; 6ES7211-1AE31-0XB0; 6ES72

PROBLEM: The valve of a mixer tap shall be controlled according to a desired given temperature. A three-way mixing valve with valve actuator is used. The valve is digital controlled in both directions. This is referred to as a 3-point stepper control.
Varying the valve position can yield any mixing ratio of hot and cold entering water and so the water outlet temperature.

SOLUTION: For SIMATIC S7-1200 as of firmware V2.0, the development environment STEP 7 V11 provides the "PID_3Step" 3-point stepper control block.

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