9.1 JoiningDataVariableType
The JoiningDataVariableType is a subtype of the BaseDataVariableType. It is to describe common sematic required for variables in the system. In this version of the specification, it provides information about physical quantity and Engineering Units. It is formally defined in Table 203.
| Attribute | Value | ||||||
| BrowseName | JoiningDataVariableType | ||||||
| IsAbstract | False | ||||||
| ValueRank | −1 (−1 = Scalar) | ||||||
| DataType | BaseDataType | ||||||
| References | NodeClass | BrowseName | DataType | TypeDefinition | Other | ||
|---|---|---|---|---|---|---|---|
| Subtype of the 0:BaseDataVariableType defined in OPC 10000-5. | |||||||
| 0:HasComponent | Variable | PhysicalQuantity | 0:Byte | 0:MultiStateDiscreteType | O, RO | ||
| 0:HasProperty | Variable | 0:EngineeringUnits | 0:EUInformation | 0:PropertyType | O, RO | ||
| Conformance Units | |||||||
|---|---|---|---|---|---|---|---|
| IJT Engineering Units |
The component Variables of the JoiningDataVariableType have additional Attributes defined in Table 204.
| BrowsePath | Value Attribute |
OTHER TIME TORQUE ANGLE IMPULSE DISTANCE AREA VOLUME FORCE PRESSURE VOLTAGE CURRENT RESISTANCE POWER ENERGY MASS TEMPERATURE FREQUENCY JOLT VIBRATION NUMBER LINEAR_SPEED ANGULAR_SPEED LINEAR_ACCELERATION ANGULAR_ACCELERATION TORQUE_SPEED TORQUE_PER_ANGLE_GRADIENT TORQUE_PER_ANGLE_GRADIENT2 |
PhysicalQuantity is to determine the type of the physical quantity associated to a given value(s). It has the following pre-defined values which shall be used for each instance of this type.
0 – OTHER
1 – TIME
2 – TORQUE
3 – ANGLE
4 – IMPULSE
5 – DISTANCE
6 – AREA
7 – VOLUME
8 – FORCE
9 – PRESSURE
10 – VOLTAGE
11 – CURRENT
12 – RESISTANCE
13 – POWER
14 – ENERGY
15 – MASS
16 – TEMPERATURE
17 – FREQUENCY
18 – JOLT
19 – VIBRATION
20 – NUMBER
21 – LINEAR_SPEED is the change of distance over time.
22 – ANGULAR_SPEED is the change of angle over time.
23 – LINEAR_ACCELERATION is the change of DISTANCE_SPEED over time.
24 – ANGULAR_ACCELERATION is the change of ANGULAR_SPEED over time.
25 – TORQUE_SPEED is the change of torque over time.
26 – TORQUE_ACCELERATION is change of TORQUE_SPEED over time.
27 – TORQUE_PER_ANGLE_GRADIENT is the change of torque over angle.
28 – TORQUE_PER_ANGLE_GRADIENT2 is the change of TORQUE_PER_ANGLE_GRADIENT over angle. Example: It is used for yield and snug detection. It represents the change of the slope in a torque over angle graph.
0:EngineeringUnits defines the engineering unit of the values.
Note: The quantity and units of the value is of importance, and it is going to be defined in harmonized way.
Note on Physical Quantity and Engineering Units
JoiningDataVariableType describes a minimal way to provide the PhysicalQuantity and EngineeringUnits properties for a given value.
An application can ensure that those are available by using a corresponding Conformance Unit defined for this use case.
If an application does not provide the EngineeringUnits for a given value, it is assumed to be in International System of Units (SI).