FB_CTRL_STEPPING_MOTOR_OUT

FB_CTRL_STEPPING_MOTOR_OUT 1:

This function block generates a control value for a stepper motor.

Behavior of the output

FB_CTRL_STEPPING_MOTOR_OUT 2:

Inputs

VAR_INPUT
    fIn                : FLOAT; 
    bUpperLimitSwitch  : BOOL;
    bLowerLimitSwitch  : BOOL;
    fManSyncValue      : FLOAT;
    bSync              : BOOL;
    eMode              : E_CTRL_MODE;
END_VAR

Name	Type	Description
fIn	FLOAT	Controller's control value (controller output)
bUpperLimit Switch	BOOL	Limit switch, becomes TRUE when the upper stop is reached.
bLowerLimit Switch	BOOL	Limit switch, becomes TRUE when the lower stop is reached.
fManSyncValue	FLOAT	Input with which the internal state of the motor setting can be adjusted, or whose value is adopted in manual mode.
bSync	BOOL	With a rising edge at this input the internal step counter is set to the step that corresponds to the value "fManSyncValue".
eMode	E_CTRL_MODE	Input that specifies the operation mode of the function block.

	For synchronization with the current valve position, this function block has the mode eCTRL_MODE_SYNC_MOVEMENT. In this mode, pulses for closing the valve are output until the valve is safely closed. The function block is then synchronized with this valve position. Once the synchronization process is completed, eCTRL_STATE_ACTIVE mode is automatically activated.

Outputs

VAR_OUTPUT
    bOutBitPos   : BOOL; 
    bOutBitNeg   : BOOL; 
    nActualStep  : DINT; 
    eState       : E_CTRL_STATE;
    eErrorId     : E_CTRL_ERRORCODES;
    bError       : BOOL;
END_VAR

Name	Type	Description
bOutBitPos	BOOL	Output required to drive the motor in a positive direction.
bOutBitNeg	BOOL	Output required to drive the motor in a negative direction.
nActualStep	DINT	Actual step at which the motor is positioned.
eState	E_CTRL_STATE	State of the function block
eErrorId	E_CTRL_ERRORCODES	Supplies the error number when the output `bError` is set.
bError	BOOL	Becomes TRUE, as soon as an error occurs.

Inputs/ outputs

VAR_IN_OUT
    stParams    : ST_CTRL_STEPPING_MOTOR_OUT_PARAMS;
END_VAR

Name	Type	Description
stParams	ST_CTRL_STEPPING_MOTOR_ OUT_PARAMS	Parameter structure of the function block

stParams consists of the following elements:

TYPE
ST_CTRL_STEPPING_MOTOR_OUT_PARAMS:
STRUCT
    tCtrlCycleTime             : TIME := T#0ms;
    tTaskCycleTime             : TIME := T#0ms; 
    tOnTime                    : TIME;
    tOffTime                   : TIME;
    nMaxMovingPulses           : DINT;
    nMinMovingPulses           : UINT := 0;
    bHoldWithOutputOn          : BOOL;
    nAdditionalPulsesAtLimits  : DINT;
    bMoveOnLimitSwitch         : BOOL;
    fCtrlOutMax                : FLOAT := 100.0;
    fCtrlOutMin                : FLOAT := 0.0;
END_STRUCT
END_TYPE

Name	Type	Description
tCtrlCycleTime	TIME	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	TIME	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.
tOnTime	TIME	Pulse length
tOffTime	TIME	Pause length
nMaxMoving Pulses	DINT	Max. number of pulses required to move from one limit to another.
nMinMoving Pulses	UINT	Min. number of pulses required to move from one limit to another.
bHoldWith OutputOn	BOOL	If this parameter is set to TRUE, then an output remains set when the drive is stationary. This will result in braking.
nAdditionalPulsesAtLimits	DINT	Number of supplementary pulses that are output to reliably ensure that limits are reached.
bMoveOnLimit Switch	BOOL	If this is TRUE, then pulses are output when the control value is either 0% or 100% until the limit switch is reached.
fCtrlOutMax	FLOAT	Control value for which the valve will be driven to 100%.
fCtrlOutMin	FLOAT	Control value for which the valve will be driven to 0%.