The Table 4 defines the structure of an MDISBaseObjectType.

Table 4 – MDISBaseObjectType Definition

Attribute	Value
BrowseName	MDISBaseObjectType
IsAbstract	True
References	Node Class	BrowseName	Data Type	TypeDefinition	Other
Subtype of the 0:BaseObjectType defined in OPC 10000-5
0:HasComponent	Variable	Fault	0:Boolean	0:BaseDataVariableType	M, RO
0:HasComponent	Variable	Warning	0:Boolean	0:BaseDataVariableType	O, RO
0:HasComponent	Variable	Enabled	0:Boolean	0:BaseDataVariableType	O, RO
0:HasProperty	Variable	TagId	0:String	0:PropertyType	O, RO
0:HasComponent	Method	EnableDisable	See 6.2.3		O
0:HasComponent	Variable	FaultCode	0:UInt32	0:BaseDataVariableType	O, RO
0:HasComponent	Variable	WarningCode	0:UInt32	0:BaseDataVariableType	O, RO
0:HasSubtype	ObjectType	MDISDigitalInstrumentObjectType
0:HasSubtype	ObjectType	MDISDiscreteInstrumentObjectType
0:HasSubtype	ObjectType	MDISChokeObjectType
0:HasSubtype	ObjectType	MDISElectricChokeObjectType
0:HasSubtype	ObjectType	MDISInstrumentObjectType
0:HasSubtype	ObjectType	MDISValveObjectType
0:HasSubtype	ObjectType	MDISCIMVObjectType
0:HasSubtype	ObjectType	MDISMotorObjectType
0:HasSubtype	ObjectType	MDISAggregateObjectType
ConformanceUnits
MDIS Base Fault

The RW column indicates if a Node of Variable NodeClass is readable, writeable or both readable and writeable. Other NodeClasses (Object, Method) do not support reading or writing and do not fill in this column.

By definition a Profile can require that an Optional item be provided, it cannot change the behaviour of an Object from what is described in this specification, which includes support for any Mandatory items. Profiles are described in section 14.3.

Fault – The status of the object, true if any fault exists.

Warning – The status of the object, true if any warnings exist. A warning does not require immediate operator action.

Enabled – This Variable is set as enabled (true) by default. When disabled the Object will not report any dynamic information other than a bad status code (Bad_InvalidState). It will still report configuration related information. It will disable execution of any method that might be defined as part of the Object. For the MDISBaseObjectType the default is that only the Enabled flag, TagId and EnableDisable Method report values or perform functions. Subtypes of this ObjectType may describe additional requirements for disabled Objects.

TagId – The TagId is a unique equipment identifier. This is additional information that can be used to help identify the Variable associated with the instance of this type. This field is intended to be used to store the tag id from the P&ID.

EnableDisable – This Method allows a Client to disable or enable the Object.

FaultCode – An unsigned integer that describes a fault code(s), zero indicates no fault. The FaultCode is a 32 bit mask, with 16 bits for standard defined codes and 16 bits for vendor defined codes. Each of the Subtypes of this ObjectType defined in this specification shall define a set standard FaultCodes that apply to that ObjectType (bits 0-15). In addition, the SPCS vendor may provide vendor specific bits (bits 16-31). Once a Bit is defined (given a name), then in all Objects that use that same named fault, the same bit number is used.

WarningCode – An unsigned integer that describes a warning code(s), zero indicates no warning. The SPCS vendor will provide a definition of what the number means The WarningCode is a 32 bit mask, with 16 bits for standard defined codes and 16 bits for vendor defined codes. Each of the subtypes of this ObjectType defined in this specification shall define a set standard WarningCodes that apply to that ObjectType (bits 0-15). In addition, the SPCS vendor may provide vendor specific bits (bits 16-31). Once a Bit is defined (given a name), then in all Objects that use that same named warning, the same bit number is used.