3-Point Stepper Control with SIMATIC S7-1500
The technology object "PID_3Step" controls the valve of a mixer tap 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.
This entry won't be updated anymore because this application example is published together with the version for SIMATIC S7-1200 under the following link: Application Example "3-Point Stepper Control with SIMATIC S7-1200/S7-1500"