PLC-API VAR_OUTPUT VAR_OUTPUT bPosOut : BOOL; bNegOut : BOOL; eState : E_CTRL_STATE; eErrorId : E_CTRL_ERRORCODES; bError : BOOL; END_VAR bPosOut : This output from the 3-point element is TRUE if the upper junction of the characteristic curve is active. bNegOut : This output from the 3-point element is TRUE if the lower junction of the characteristic curve is active. 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_PARAMS; END_VAR stParams : Parameter structure of the 3-point element. This consists of the following elements:
TYPE ST_CTRL_3POINT_PARAMS : STRUCT tCtrlCycleTime : TIME := T#0ms; (* controller cycle time [TIME] *) tTaskCycleTime : TIME := T#0ms; (* task cycle time [TIME] *) fPosOutOn : FLOAT; (* switch to bPosOut on *) fPosOutOff : FLOAT; (* switch to bPosOut off *) fNegOutOn : FLOAT; (* switch to bNegOut on *) fNegOutOff : FLOAT; (* switch to bNegOut off *) 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. fPosOutOn : Control deviation that will result in bPosOut = FALSE being switched to bPosOut = TRUE (bNegOut = FALSE). fPosOutOff : Control deviation that will result in bPosOut = TRUE being switched to bPosOut = FALSE (bNegOut = FALSE). fNegOutOn : Control deviation that will result in bNegOut = FALSE being switched to bNegOut = TRUE (bPosOut = FALSE). fNegOutOff : Control deviation that will result in bNegOut = TRUE being switched to bNegOut = FALSE (bPosOut = FALSE). Requirements TS4100 44 Version:
1.1 Development Environment Target System PLC libraries to include TwinCAT v2.8 PC (i386) TcControllerToolbox.lib TwinCAT v2.9 from Build 947 BC [} 10] TcControllerToolbox.lb6