FB_Wtc

Implements wall thickness control for the extruded hose in blow molding applications.

Internal functions:

Automatic coupling to a cam when switching on

Close integration with the TF8550 CurveEditor
Flexible change of curve possible with I_CurveHmi

Decoupling from the curve possible through:

DieWaitPosition for a waiting position (e.g. in accumulator mode)
Testposition for spontaneous movement to a position
Referencing.Enable for the execution of referencing processes

Synchronization to a WTC master

Time-based with FB_WtcTimer
Path-based with an FB_WtcAccumulator

Syntax:

FUNCTION_BLOCK FB_Wtc EXTENDS FB_CamAxis

Properties

Name	Type	Access	Initial value	Description
Name	STRING	Get, Set	<SourceName>	Specifies the name of the class instance.
FB_Wtc
InstantCurveActivation	BOOL	Get, Set	TRUE	If not `TRUE`, a new curve is only accepted when the master is in the first 10 % of its value range.
FB_CamAxis
EnableEnvelopeCurveAlarms	BOOL	Get, Set	FALSE	Enables monitoring of the actual curve in relation to the configured envelope.
FB_Axis
Axis	I_AxisBase	Get	NULL	Interface to the assigned TF8560 axis.
Referencing	I_Referencing	Get	<Local>	Functions for referencing the axis.
FB_Motion
Motion	I_MotionBase	Get	NULL	Interface to the assigned TF8560 motion object.
ErrorAlarmTL	TcEventSeverity	Get, Set	Error (3)	Severity of the alarm that the axis triggers in the error state.
Specific	I_MotionSpecific	Get	-	Technology-specific functions/values
FB_BaseMd
MachineData	I_MdBaseContainer	Get	-	Interface for machine data handling.
FB_Base
BaseState	E_BaseState	Get	eNotHandled	Initialization state of the class instance.
Error	BOOL	Get	FALSE	Class is in an error state.
ResultMessage	I_AppMessage	Get	-	Access to the class-internal EventLogger.
[`PROTECTED`] _Name	STRING	Get	<SourceName>	`.Name` without leading 'fb'.

¹ Is obsolete

Methods

Name	Description
Reset()	Resets the error state of the class.
FB_Wtc
CamIn(`bCmd`)	Loads the current curve and starts camming.
DieWaitPosition(`bCmd`)	Commands the WTC to the waiting position.
Power(`bCmd`)	Activates the axis including the connection to the cam plate.
SetMaster(`iMaster`)	Sets the current master to be used by the WTC. Notice If the WTC is not in the idle state, the new master is considered requested and is only assigned when idle.
Testposition(`bCmd`)	Commands the WTC to the test position.
FB_CamAxis
SetCurve(`iCurve`)	Assign the curve to be used
FB_Axis
SetPosition(`bCommand`)	Setting the axis position with the `FB_AxisHmi.Setposition.`
FB_Motion
CheckAxisState()	Checks the current state of the axis.
FeedEnable(`bFeedEnableP, bFeedEnableN`)	Enable of a direction of movement.
JogNegative(`bCommand`)	Starts/stops a jog movement in negative direction.
JogPositive(`bCommand`)	Starts/stops a jog movement in positive direction.
Power(`bCommand`)	Switching on the drive control.
SetMotionRef(`iMotion`)	Assignment method for the TF8560 motion object.
FB_BaseMd
[`PROTECTED`] AddMdComp()	Adds a component of type I_MdComponent to the machine data container.
FB_Base
GetHMI()	Returns the assigned HMI object. Notice The method is not implemented in the `FB_Base` class. If the method is not overwritten by inheritance, a pseudo variable is always returned.
SetHMI(`ipBase`)	General assignment method for an `FB_BaseHmi` extending class as a local HMI. Notice The method is not implemented in the `FB_Base` class. If the method is not overridden by inheritance, it always fails.
[`PROTECTED`] _IsMyself(`iCmp`)	Identifies whether the transferred object corresponds to its own instance.
[`PROTECTED`] _QueryNamespace()	Extracts the first part of the instance path as an object namespace.
[`PROTECTED`] _QueryObjectName()	Extracts the last part of the instance path as the object name.

Procedure controlling methods (FB_AdaptableSequence)

Name	Description
WtcStates()	Procedure for executing commands and coupling and decoupling from the cam.

Possible events

ID	Description	Alarm/Message
11	Object error state	Alarm
21	Command rejected	Alarm
100x	Axis switch on/off failed.	Message
300x	Failed to switch on/off the cam plate.	Message
301x	Envelope limit exceeded	Alarm
10	Axis Errors	Alarm
20	Axis command rejected	Alarm

Machine data

Component	Description	Index range	Number of instances
FB_MdFileInfo	File information	0x0000 Fxxx	1
FB_MdWtc	Parameters for WTC applications	0x0001 3xxx	1
FB_MdWtcTimer	Parameter for a WTC timer, only if `SetMaster()` was executed with a FB_WtcTimer	0x0001 31xx	1 (0)
FB_MdAxis	Applicative axis parameters	0x0000 1xxx	1
FB_MdNc	NC specific parameters, only if `Specific.Nc.IsNc = TRUE`	0x0000 22xx	1 (0)
FB_MdTrafo	Transformation-specific parameters, only if `Specific.Trafo.IsTrafo = TRUE`	0x0000 23xx	1 (0)
FB_MdHoming	Parameters for homing the axis	0x0000 3xxx	1

Interfaces

Type	Description
I_Base	Standard interface on FB_Base.
I_Wtc	Standard interface on FB_Wtc.
I_Axis	Standard interface on FB_Axis.
I_Motion	Standard interface on FB_Motion
I_TwoTaskInterface	Runtime interface for two PLC tasks.
I_BaseMd	Standard interface on FB_BaseMd.
I_BaseDev	Covers all methods and properties of the base class.
I_Comparable	Enables comparisons via `_IsMyself()` or F_IsSameInstance().

Requirements

Development Environment	Target platform	PLC libraries to include
TwinCAT 4026 >= v3.1.4026.16 TwinCAT 4024 >= v3.1.4024.66	PC or CX (x64, x86)	Tc3_PlasticBaseApplication (>= v12.12.0.0)

Further Information

WtcStates()