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Configuration
4.8 OPC UA
● Endianness
You use this option to specify the order in which the data of the station read word by word
is saved.
– Big Endian
– Little Endian
Numbering of the two bytes of a word: | 1 | 0 |
4.8
OPC UA
4.8.1
OPC UA server
Requirements
CPU tags
The process data that the gateway makes available to the OPC UA services, originate in the
connected S7-CPU. You will find the permitted memory areas of the CPU and the supported
data types in the section Data points (Page 101).
A data point that is configured for OPC UA cannot be configured for transfer to a cloud
broker.
The data point names assigned during data point configuration are included in the NodeID of
an item as part of the identifier, see section Properties of the OPC UA server (Page 74).
Note:
Where possible read tags in in data blocks block by block per DB to achieve a higher speed.
Security settings: Server certificate
If you enable the OPC UA server of the gateway, you must create or import a self-signed
server certificate.
OPC UA server
● Host name (optional)
Optional input box for a host name that can be used instead of the IP address of the UA
endpoint of the gateway.
If you do not want to use a host name, leave the box empty.
● Application URI
Unique OPC UA server URI of the gateway with the following preset components:
<Scheme (Protocol)>:<Authority (Server)>:<Path>
Default:
– urn:Siemens:UA:CC7
The protocol part (urn) must not be changed; the other components can be configured.
68
The higher byte 1 is saved first. (Modbus standard)
The lower byte 0 is saved first.
Operating Instructions, 10/2019, C79000-G8976-C503-02
SIMATIC CC7
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