OPC UA AccessLevel Decoder

Value

AccessLevel / UserAccessLevel / AccessLevelExDecimal, 0x hex or 0b binary. Toggle bits on the right to compose a value.

UserAccessLevel uses the same bits for the current user. Writes fail with BadNotWritable when CurrentWrite is missing in AccessLevel, and with BadUserAccessDenied when only UserAccessLevel lacks it.

Bits

0CurrentReadThe current value can be read (and subscribed to).

1CurrentWriteThe current value can be written.

2HistoryReadHistory of the value can be read.

3HistoryWriteHistory can be updated.

4SemanticChangeThe variable generates SemanticChange events when its meaning (units, range) changes.

5StatusWriteThe StatusCode can be written together with the value.

6TimestampWriteThe SourceTimestamp can be written together with the value.

8NonatomicReadAccessLevelExReads are not atomic (0 means atomicity is guaranteed).

9NonatomicWriteAccessLevelExWrites are not atomic (0 means atomicity is guaranteed).

10WriteFullArrayOnlyAccessLevelExWriting an IndexRange (part of an array) is not supported.

11NoSubDataTypesAccessLevelExThe variable does not accept subtypes of its DataType.

12NonVolatileAccessLevelExThe value is stored non-volatile (survives restarts).

13ConstantAccessLevelExThe value can be considered constant.

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OPC UA AccessLevel Decoder

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