Parametering the function block consists of defining the properties of each actuator, i.e. in the kind of gradient modification of both control outputs in relation to the input IN.
The following points should be defined for the output OUT1:
|
Element
|
Meaning
|
|
out1_inf
|
Lower threshold range
|
|
out1_sup
|
Upper threshold range
|
|
out1_th1
|
Threshold value, i.e the input value IN, for which the following applies: Output OUT1 = out1_inf
|
|
out1_th2
|
Threshold value, i.e the input value IN, for which the following applies: Output OUT1 = out1_sup
|
The modification of the value of OUT1 is linear for both threshold values. With the exception of the two threshold values, no further output modification can occur; it is limited to out1_inf or out1_sup.
Depending on the adjustment of the two threshold values, the control properties are designated by a positive increase (for out1_th1 < out1_th2) or a negative increase (for out1_th2 < out1_th1).
The following shows the properties of the two actuators in three-point step-control
The following shows the properties of the two actuators in split range control
NOTE: The outputs of this controller cannot be used to control a SERVO function block without positional feedback.
The
SPLRG function block is not assigned to any specific operating mode. However both function block outputs may be controlled manually because an
MS is locked on to each output. During programming the user should ensure a bumpless return to automatic mode.
