PLC-API VAR_INPUT VAR_INPUT fSetpointValue : FLOAT; fActualValue : FLOAT; fManValue : BOOL; eMode : E_CTRL_MODE; END_VAR fSetpointValue : Set value of the controlled variable. fActualValue : Actual value of the controlled variable. fManValue : Input whose value is output in manual mode. eMode : Input that specifies the block's operating mode [ } 16] . VAR_OUTPUT VAR_OUTPUT fOut : nPOINT_CTRL_TABLE_ELEMENT; eState : E_CTRL_STATE; eErrorId : E_CTRL_ERRORCODES; bError : BOOL; END_VAR fOut : Output of the n-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_nPOINT_PARAMS; END_VAR stParams : Parameter structure of the n-point element. This consists of the following elements: TYPE ST_CTRL_nPOINT_PARAMS : STRUCT tCtrlCycleTime : TIME := T#0ms; (* controller cycle time [TIME] *) tTaskCycleTime : TIME := T#0ms; (* task cycle time [TIME] *) pDataTable_ADR : POINTER TO nPOINT_CTRL_TABLE_ELEMENT := 0; nDataTable_SIZEOF : UINT := 0; nDataTable_NumberOfRows : UINT := 0; fHysteresisRange : FLOAT; (* range of the hysteresis loop *) 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. pDataTable_ADR : Address of the data table. nDataTable_SIZEOF : Size of the data table in bytes. nDataTable_NumberOfRows : Number of rows in the data table. fHysteresisRange : Hysteresis range, see image above. The hysteresis range functions as described for FB_CTRL_2POINT [ } 39] . TS4100 48 Version: 1.1