PLC-API VAR_INPUT VAR_INPUT fIn : FLOAT; END_VAR fIn : Input value for the function block. VAR_OUTPUT VAR_OUTPUT fOut : FLOAT; bMinLimit : BOOL; bMaxLimit : BOOL; eErrorId : E_CTRL_ERRORCODES; bError : BOOL; END_VAR fOut : Output of the function block. bMinLimit : A TRUE at this output indicates that the output has reached the lower limit. bMaxLimit : A TRUE at this output indicates that the output has reached the upper limit. 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_LIMITER_PARAMS; END_VAR stParams : Parameter structure of the function block.
This consists of the following elements: TYPE ST_CTRL_LIMITER_PARAMS: STRUCT tCtrlCycleTime : TIME := T#0ms; (* controller cycle time [TIME] *) tTaskCycleTime : TIME := T#0ms; (* task cycle time [TIME] *) fMinOutput : FLOAT; fMaxOutput : FLOAT; 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. fMinOutput : Lower limit at which the output is limited. fMaxOutput : Upper limit at which the output is limited. Requirements TS4100 122 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 TwinCAT v2.9 from Build 956 BX [} 10] TcControllerToolbox.lbx