Coordinating Write And Read Rights For Cpu Tags - Siemens SIMATIC ET 200AL System Manual

Example: Structure of EUInformation with UDT "LocalizedText"
MinimumSamplingInterval attribute of tags
In addition to "Value", "DataType" and "AccessLevel", you can also set the
"MinimumSamplingInterval" attribute for a tag in the XML file that represents the server
address space. The attribute specifies how fast the server can sample the tag value.
The following rule applies to the OPC UA server of the S7-1500 CPU for possible values of
MinimumSamplingInterval:
● Use only positive integers between 0 and 4294967.
Decimal numbers with a comma as decimal place (for example, 0,55) are not allowed
because they are misinterpreted. With decimal numbers up to 7 digits with a comma as
decimal place, the comma is removed, with decimal numbers with more than 7 digits the
value is set to the maximum: 4294967.295.
Negative numbers are set to the maximum possible value 4294967.295.
9.3.5.2

Coordinating write and read rights for CPU tags

Definition of write and read rights in the information model (OPC UA XML)
In the OPC UA information model, the attribute "AccessLevel" regulates access to tags.
AccessLevel is defined bit by bit:
Bit 0 = CurrentRead and Bit 1 = CurrentWrite. The meaning of the bit combinations is as
follows:
● AccessLevel = 0: no access
● AccessLevel = 1: read only
● AccessLevel = 2 write only
● AccessLevel = 3: read+write
Communication
Function Manual, 12/2017, A5E03735815-AF
OPC UA communication
9.3 Using the S7-1500 as an OPC UA server
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