FB_CTRL_P
The function block provides a P-transfer element in the functional diagram.
Transfer function:
VAR_INPUT
VAR_INPUT
fIn :FLOAT;
eMode :E_CTRL_MODE;
END_VAR
fIn : Input of the P element.
eMode : Input that specifies the block's operating mode.
VAR_OUTPUT
VAR_OUTPUT
fOut :FLOAT;
eState :E_CTRL_STATE;
eErrorId :E_CTRL_ERRORCODES;
bError :BOOL;
END_VAR
fOut : Output of the P element.
eState : State of the function block.
eErrorId : Supplies the error number when the bError output is set.
bError : Becomes TRUE, as soon as an error occurs.
VAR_IN_OUT
VAR_IN_OUT
stParams :ST_CTRL_P_PARAMS;
END_VAR
stParams : Parameter structure of the P element. This consists of the following elements:
TYPE ST_CTRL_P_PARAMS
:
STRUCT
tCtrlCycleTime : TIME := T#0ms; (* controller cycle
time *)
tTaskCycleTime : TIME := T#0ms; (* task cycle time
*)
fKp : FLOAT := 0.0; (* proportional gain Kp
*)
END_STRUCT
END_TYPE
tCtrlCycleTime : Cycle time with which the control loop is processed. This must be greater than or equal to the TaskCycleTime. The function block uses this input value to calculate internally whether the state and the output values have to be updated in the current cycle.
tTaskCycleTime : Cycle time with which the function block is called. If the function block is called in every cycle this corresponds to the task cycle time of the calling task.
fKp : Proportional gain of the P element.