InjectionUnitCycleParametersType – OPC UA interfaces for plastics and rubber machinery – Data exchange between injection moulding machines and MES

17.3 InjectionUnitCycleParametersType

The InjectionUnitCycleParametersType represents information on the production cycle related to an injection unit. This type is used to extend the CycleParametersEventType defined in OPC 40083.

The BrowseNames of the additional objects shall be “InjectionUnitCycleParameters_<Nr>” (starting with 1)

Table 6 – Example of an event type derived from CycleParametersEventType
with two moulds and two injection units

Attribute	Value
BrowseName	ExampleCycleParametersEventType
IsAbstract	false

References	Node Class	BrowseName	TypeDefinition	Other
Subtype of 3:CycleParametersEventType defined in OPC 40083
0:HasComponent	Object	MouldCycleParameters_1	Example1Mould CycleParametersType	M
0:HasComponent	Object	MouldCycleParameters_2	Example2Mould CycleParametersType	M
0:HasComponent	Object	InjectionUnitCycleParameters_1	Example1InjectionUnit CycleParametersType	M
0:HasComponent	Object	InjectionUnitCycleParameters_2	Example2InjectionUnit CycleParametersType	M

The Types Example1MouldCycleParametersType and Example2MouldCycleParametersType used in the example are subtypes of the MouldCycleParametersType defined in OPC 40083. The Types Example1InjectionUnitCycleParametersType and Example2InjectionUnitCycleParametersType are subtypes of the InjectionUnitCycleParametersType which is formally defined Table 7.

Table 7 – InjectionUnitCycleParametersType Definition

Attribute	Value
BrowseName	InjectionUnitCycleParametersType
IsAbstract	True

References	Node Class	BrowseName	DataType	TypeDefinition	Other
Subtype of 0:BaseObjectType defined in OPC UA Part 5
0:HasProperty	Variable	Index	0:UInt32	0:PropertyType	M
0:HasComponent	Variable	CushionVolume	0:Double	0:AnalogItemType	M
0:HasComponent	Variable	CushionStroke	0:Double	0:AnalogItemType	O
0:HasComponent	Variable	PlastificationVolume	0:Double	0:AnalogItemType	M
0:HasComponent	Variable	DecompressionVolumeBeforePlastification	0:Double	0:AnalogItemType	O
0:HasComponent	Variable	DecompressionVolumeAfterPlastification	0:Double	0:AnalogItemType	O
0:HasComponent	Variable	HydraulicPressureMaximum	0:Double	0:AnalogItemType	O
0:HasComponent	Variable	SpecificPressureMaximum	0:Double	0:AnalogItemType	M
0:HasComponent	Variable	PlastificationRotationalSpeedMaximum	0:Double	0:AnalogItemType	O
0:HasComponent	Variable	PlastificationRotationalSpeedAverage	0:Double	0:AnalogItemType	O
0:HasComponent	Variable	PlastificationCircumferentialSpeedMaximum	0:Double	0:AnalogItemType	O
0:HasComponent	Variable	PlastificationCircumferentialSpeedAverage	0:Double	0:AnalogItemType	O
0:HasComponent	Variable	InjectionSpeedMaximum	0:Double	0:AnalogItemType	O
0:HasComponent	Variable	InjectionSpeedAverage	0:Double	0:AnalogItemType	O
0:HasComponent	Variable	TransferVolume	0:Double	0:AnalogItemType	O
0:HasComponent	Variable	TransferStroke	0:Double	0:AnalogItemType	O
0:HasComponent	Variable	HoldHydraulicPressureMaximum	0:Double	0:AnalogItemType	O
0:HasComponent	Variable	HoldHydraulicPressureAverage	0:Double	0:AnalogItemType	O
0:HasComponent	Variable	HoldSpecificPressureMaximum	0:Double	0:AnalogItemType	O
0:HasComponent	Variable	HoldSpecificPressureAverage	0:Double	0:AnalogItemType	O
0:HasComponent	Variable	CavityPressureMaximum	0:Double	0:AnalogItemType	O
0:HasComponent	Variable	PlastificationHydraulicPressureMaximum	0:Double	0:AnalogItemType	O
0:HasComponent	Variable	PlastificationHydraulicPressureAverage	0:Double	0:AnalogItemType	O
0:HasComponent	Variable	PlastificationSpecificPressureMaximum	0:Double	0:AnalogItemType	O
0:HasComponent	Variable	PlastificationSpecificPressureAverage	0:Double	0:AnalogItemType	O
0:HasComponent	Variable	TransferHydraulicPressure	0:Double	0:AnalogItemType	O
0:HasComponent	Variable	TransferSpecificPressure	0:Double	0:AnalogItemType	O
0:HasComponent	Variable	TransferCavityPressure	0:Double	0:AnalogItemType	O
0:HasComponent	Variable	BackPressure	0:Double	0:AnalogItemType	O
0:HasComponent	Variable	InjectionTime	0:Duration	0:BaseDataVariableType	M
0:HasComponent	Variable	DosingTime	0:Duration	0:BaseDataVariableType	M
0:HasComponent	Variable	FlowIndex	0:Double	0:AnalogItemType	O
0:HasComponent	Variable	InjectionStartPosition	0:Double	0:AnalogItemType	O
0:HasComponent	Variable	VPChangeOverPosition	0:Double	0:AnalogItemType	O

Table 8 contains a description of the parameters listed in Table 7.

Table 8 – Description of cycle parameters

Parameter	Description
Index	Index of the InjectionUnit (see 16.2)
CushionVolume	Material volume remained in front of the screw after injection and holding pressure
CushionStroke	Stroke position at cushion
PlastificationVolume	Volume dosed by the machine for the next injection shot
DecompressionVolumeBeforePlastification	Decompression before plastification is the movement of the screw in the opposite direction to injection
DecompressionVolumeAfterPlastification	Decompression after plastification is the movement of the screw in the opposite direction to injection
HydraulicPressureMaximum	Maximum pressure in the hydraulic cylinder
SpecificPressureMaximum	Pressure in front of the screw tip
PlastificationRotationalSpeedMaximum	Maximum plastification speed of the injection unit (RPM)
PlastificationRotationalSpeedAverage	Average plastification speed of the injection unit (RPM)
PlastificationCircumferentialSpeedMaximum	Maximum screw circumferential speed for plastification (e.g. mm/s)
PlastificationCircumferentialSpeedAverage	Average screw circumferential speed for plastification (e.g. mm/s)
InjectionSpeedMaximum	Maximum injection speed (e.g. mm/s)
InjectionSpeedAverage	Average injection speed (e.g. mm/s)
TransferVolume	Switch-over point to the holding pressure via volume
TransferStroke	Switch-over point to the holding pressure via stroke
HoldHydraulicPressureMaximum	Maximum holding pressure in the hydraulic cylinder
HoldHydraulicPressureAverage	Average holding pressure in the hydraulic cylinder
HoldSpecificPressureMaximum	Maximum holding pressure in front of the screw
HoldSpecificPressureAverage	Average holding pressure in front of the screw
CavityPressureMaximum	Maximum pressure during the injection process in the cavity or mould
PlastificationHydraulicPressureMaximum	Maximum plastification pressure in cylinder
PlastificationHydraulicPressureAverage	Average plastification pressure in cylinder
PlastificationSpecificPressureMaximum	Maximum plastification pressure in front of the screw tip
PlastificationSpecificPressureAverage	Average plastification pressure in front of the screw tip
TransferHydraulicPressure	Hydraulic pressure in the cylinder during switch-over to the holding pressure
TransferSpecificPressure	Pressure in front of the screw tip during switch-over to the holding pressure
TransferCavityPressure	Cavity pressure in the mould during switch-over to the holding pressure
BackPressure	Back pressure is the melt-pressure against the screw movement during dosage
InjectionTime	Time required to fill the cavity or mould
DosingTime	Time to melt-up the plastic granulates and feed the melt for the next injection shot to the front of the screw
FlowIndex	Integral of the injection pressure over the injection time as measure for the injection work
InjectionStartPosition	Start position of the injection
VPChangeOverPosition	Screw position at switching between injection (V) and holding pressure (P)

The InjectionUnitCycleParametersType is abstract and the OPC server of the machine shall create a derived type with the additional objects of TemperatureZoneCycleParametersType (defined in OPC 40083) for the temperature zones of the barrel. The BrowseNames of the objects shall be “BarrelTemperatureZoneCycleParameters _<Nr>” (starting with 1 for each injection unit).