ConversionLimitEnum indicates whether the ServerUnit can be converted. A distinction is made between NO_CONVERSION, LIMITED and UNLIMITED. NO_CONVERSION means that no conversion is allowed (e.g. for statistical values). LIMITED conversion means that either only the conversions mentioned in the AlternativeUnits are to be used or the client requires specific know-how for the conversion. UNLIMITED means the conversion is simple and possible if the client knows the UnitSystem. The enumeration is defined in Table 51.
Table 51 – ConversionLimitEnum Items
|
Name |
Value |
Description |
|
NO_CONVERSION |
0 |
No conversion of the value allowed (e.g. statistical value). |
|
LIMITED |
1 |
Conversion only permitted on the basis of the conversions specified by the server, or if the client has the appropriate domain knowledge to perform an independent conversion. |
|
UNLIMITED |
2 |
Conversion on the basis of the specified unit according to the rules of the source system of units (e.g. SI / ISQ) and the coding system (e.g. UCUM) is permitted. |
Its representation in the AddressSpace is defined in Table 52.
Table 52 – ConversionLimitEnum Definition
|
Attribute |
Value |
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|
BrowseName |
ConversionLimitEnum |
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|
IsAbstract |
False |
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|
References |
NodeClass |
BrowseName |
DataType |
TypeDefinition |
Other |
|
|
Subtype of the Enumeration type defined in OPC 10000-5 |
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|
HasProperty |
Variable |
EnumStrings |
LocalizedText [] |
PropertyType |
|
|
|
Conformance Units |
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|
Data Access Alternative Units |
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