FB_MasterVelFeedForward - General Information

Overview

Type:	Function block
Available as of:	V1.0.0.0
Versions:	Current version

Task

Calculation of the required feed forward velocity for an infeed distance

Description

The mean product flow on the feed belt and on the target belt of an infeed distance must be the same. However, the product feed that precedes an infeed distance normally delivers a product flow with a variable time mean value. If idle cycles on the target belt are to be avoided, the velocity of the target belt must be adjusted to the mean product flow of the feed belt or vice versa.

To this end, the POU measures the mean product flow of the feed belt and the mean flow of the targets on the target belt and from this calculates the velocity at which the feed belt or the target belt has to move in order to match the mean product flow of the mean flow of the targets.

Interface

Input	Data type	Description
i_xEnable	BOOL	A rising edge FALSE -> TRUE activates the POU, a falling edge TRUE -> FALSE deactivates the POU. A deactivated POU does not execute any actions.
i_xStart	BOOL	A rising edge FALSE -> TRUE starts the calculation with the set parameters.
i_xWsSelect	BOOL	TRUE: Warm start is selected. In the case of a positive edge at i_xStart, a warm start is performed.
i_ifInfeed	IF_Infeed	The instance of the FB_Infeed for which the calculation is to be performed.

Output	Data type	Description
q_xActive	BOOL	TRUE: The POU is active and has to be executed further. FALSE: The POU is inactive.
q_xReady	BOOL	TRUE: The POU is ready to operate and can accept user commands. FALSE: The function block is not ready to accept user commands.
q_etDiag	GD.ET_Diag	General library-independent statement on the diagnostic. A value unequal to GD.ET_Diag.Ok corresponds to a diagnostic message.
q_etDiagExt	ET_DiagExt	POU-specific output on the diagnostic. q_etDiag = GD.ET_Diag.Ok -> status message q_etDiag <> GD.ET_Diag.Ok -> diagnostic message
q_sMsg	STRING[80]	Event-triggered message which gives more detailed information on the diagnostic state.

Input/Output	Data type	Description
iq_stParameter	ST_VelFeedForwardParameter	The parameters of the POU
iq_stFeedBack	ST_VelFeedForwardFeedback	The return values of the POU

Diagnostic Messages

q_etDiag	q_etDiagExt	Enumeration value	Description
OK	Disabling	7	The POU is being disabled.
OK	Disabled	1	The POU is disabled.
OK	Initializing	2	The POU is being initialized.
OK	WaitForStart	3	Waiting for starting command.
OK	Working	6	The POU is working.
ControllerConditionInvalid	NoTimeInterface	26	The controller does not support all required time functionalities.
InputParameterInvalid	BeltIdRange	11	BeltId is outside the valid range.
InputParameterInvalid	InfeedInvalid	94	An invalid infeed POU has been transferred.
UnexpectedProgramBehavior	UnknownFeedback	20	An unexpected error occurred during execution.

BeltIdRange

Enumeration name:	BeltIdRange
Enumeration value:	11
Description:	BeltId is outside the valid range.

Issue	Cause	Solution
-	An invalid value has been applied at the input i_lrVel.	It must be made sure that a value greater than 0 and smaller than the number of parameterized belts of the connected FB_Infeed POU is applied at the iq_stParameter.udiBeltId input.

Disabled

Enumeration name:	Disabled
Enumeration value:	1
Description:	The POU is disabled.

The function block is deactivated, it executes no actions whatsoever. i_xEnable and q_xActive have the value FALSE.

Disabling

Enumeration name:	Disabling
Enumeration value:	7
Description:	The POU is being disabled.

The POU is being disabled.

InfeedInvalid

Enumeration name:	InfeedInvalid
Enumeration value:	94
Description:	An invalid infeed POU has been transferred.

Issue	Cause	Solution
-	An invalid object has been applied at the input i_ifInfeed.	It must be made sure that the instance of the FB_Infeed POU is transferred to the i_ifInfeed input, the belts of which are to be monitored.

Initializing

Enumeration name:	Initializing
Enumeration value:	2
Description:	The POU is being initialized.

The function block is being initialized and thus is not yet ready to receive commands at its inputs.

The POU will signalize that it is ready for operation with the signal q_xReady = TRUE.

NoTimeInterface

Enumeration name:	NoTimeInterface
Enumeration value:	26
Description:	The controller does not support all required time functionalities.

Issue	Cause	Solution
-	The connected controller does not support all required functionalities.	Use a controller that supports all required functionalities.

UnknownFeedback

Enumeration name:	UnknownFeedback
Enumeration value:	20
Description:	An unexpected error occurred during execution.

Issue	Cause	Solution
-	An error occurred in the internal execution.	Please inform the support team about this error.

WaitForStart

Enumeration name:	WaitForStart
Enumeration value:	3
Description:	Waiting for starting command.

The function block has completed its initialization and is waiting for a positive edge at the input i_xStart before continuing the processing.

Working

Enumeration name:	Working
Enumeration value:	6
Description:	The POU is working.

The feed forward velocities are being calculated.

Methods

Name	Description
RegisterLoggerPoint	Registers the internal logger point in the Application Logger.