PLC-API eErrorId : E_CTRL_ERRORCODES; bError : BOOL; END_VAR bOut : Output of the 2-point element. eState : State of the function block. eErrorId : Supplies the 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_2POINT_PARAMS; END_VAR stParams : Parameter structure of the 2-point element. This consists of the following elements: TYPE ST_CTRL_2POINT_PARAMS : STRUCT tCtrlCycleTime : TIME := T#0ms; (* controller cycle time [TIME] *) tTaskCycleTime : TIME := T#0ms; (* task cycle time [TIME] *) 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. fHysteresisRange : Hysteresis range, see image above. Requirements 5.4.2 FB_CTRL_2POINT_PWM_ADAPTIVE The function block provides an adaptive two-position controller.
It is particularly suitable for single-area controllers in which high flow temperatures are present and which make use of a thermal actuator. TS4100 40 Version: 1.1 Development environment Target platform PLC libraries to include TwinCAT v2.8 PC (i386) TcControllerToolbox.lib TwinCAT v2.9 from Build 947 BC [} 10] TcControllerToolbox.lb6 TwinCAT v2.9 from Build 956 BX [} 10] TcControllerToolbox.lbx