How do I implement the feature of a three step controller with PID Loop in a S7-200?
This entry contains a description of the three step controllers and its configuration in STEP 7 Micro/WIN by means of the supplied blocks as STEP 7 Micro/WIN library. Example of a Three Step Controller : Water Level Fig. 1: Example Water Level The control variable of this loop is the water level in the tank (current value). The water level is measured by a sensor and supplied to the PID loop . Depending on which setpoint of the water level is given, the electrically adjustable valve must be activated by the motor. The valve can only be opened or closed slowly by the motor. The output of the controller delivers the manipulated variable of the change of the valve position. Because of the inertness of the valve motor, the given manipulated variable is not directly adjusted at the valve. Thus, the current valve position is determined and compared with output value of the controller. There are two possibilities to determine the current position of the valve: determination of the valve posit
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