PLC-API VAR_INPUT VAR_INPUT fSetpointValue : FLOAT; fActualValue : FLOAT; fManSyncValue : FLOAT; bSync : BOOL; eMode : E_CTRL_MODE; END_VAR fSetpointValue : Setpoint of the controlled variable. fActualValue : Actual value of the controlled variable. fManSyncValue : Input through which the extended 3-point element can be set to one of the junctions. | fManSyncValue | | fManSyncValue | >= 1 → fOut = fE * fGain + fOffset bSync : A rising edge at this input sets the 3-point element to the value fManSyncValue. eMode : Input that specifies the operation mode [ } 16] of the function block. VAR_OUTPUT VAR_OUTPUT fOut : FLOAT; eState : E_CTRL_STATE; eErrorId : E_CTRL_ERRORCODES; bError :
BOOL; END_VAR fOut : Output of the extended 3-point element. eState : State of the function block. nErrorID : Returns the ADS error number [ } 16] when the bError output is set. bError: Becomes TRUE, as soon as an error occurs. VAR_IN_OUT VAR_IN_OUT stParams : ST_CTRL_3POINT_EXT_PARAMS; END_VAR stParams : Parameter structure of the extended 3-point element. This consists of the following elements: TYPE ST_CTRL_3POINT_EXT_PARAMS : STRUCT tCtrlCycleTime : TIME := T#0ms; (* controller cycle time [TIME] *) tTaskCycleTime : TIME := T#0ms; (* task cycle time [TIME] *) fOutOff : FLOAT; (* x-parameter for threshold OFF *) fOutOn : FLOAT; (* x-parameter for threshold ON *) fGain :
FLOAT; (* y-parameter gain *) fOffset : FLOAT; (* y-parameter offset *) 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. fOutOff : If the system deviation falls below this value, the output is switched off (set to zero). TS4100 46 Version: 1.1