STEP 7 V15 Simple Sample: PID Control, SplitRange (Split Range feature)

Hi,

Many controller applications involve more than one actuator. In these cases, a PID output should be “split” between these actuators. It is frequently, for example, to have one actuator to increase and a second one to decrease the process value, or one actuator to low action and other one to high action (non linear processes).

As from STEP 7 V15, it is available the SplitRange instruction (Tool box, Technology, PID Control, Auxiliary Functions).

In the attached program example a PID (output from -100 to +100) uses two SplitRange instructions to be connected to two actuators (one to increase the process value, the other one to decrease).

The SplitRange parameters where set so that from 0 to 100 PID output the first actuator acts, from -100 to 0 the second one acts.

The Setpoints, Output and a simulation of the process values could be monitored by the Watch table.