Siemens SIMATIC CloudConnect CC7 Series Operating Instructions Manual page 77

Note
Consistency check of parameters for Publisher and Subscriber
If the gateway as a subscriber receives data from a publisher during runtime, the subscriber
checks the following parameters supplied by the publisher in the user data for each value
received:
• Topic name
• Data point name
• Data type
If these three parameters of the publisher are identical with the parameters configured in the
subscriber and if the quality code of the message is "GOOD", the subscriber writes the
received data into the data block of its CPU.
If these three publisher parameters do not match the parameters configured in the
subscriber, the subscriber discards the data.
The station name of a publisher is not evaluated by the gateway as a subscriber.
Recommendations for configuration
When transferring data in a hierarchically structured system, it is generally advisable to
name the components according to this hierarchical structure.
Example for the name of a data point to be transferred:
"Plant_1/Unit_1/Aggregate_1/DB_1_Signal_1".
For access to the process data of an S7 station, the gateway can directly access inputs and
outputs or tags of the CPU.
Within a cloud application, individual publishers can publish data for multiple subscribers..
Individual subscribers can subscribe to data from multiple publishers.
For better clarity of the data and to reduce the possibility of identical names, the following
procedure is recommended for configuration:
● Data point name / DB number
Use the number of the data block (DB) that the data point accesses as part of the data
point name.
● Publisher
Integrate the station name as part of the data point name, for example, as prefix. This will
result in unique data point names.
● Subscriber
Create a separate DB for each publisher in the assigned CPU.
Configuration error - Diagnostic messages
If you experience different behavior than expected after commissioning the gateway, use the
diagnostic messages of the gateway that you can find in the WBM under "Maintenance >
Diagnostics".
SIMATIC CC7
Operating Instructions, 10/2019, C79000-G8976-C503-02
Configuration
4.9 Cloud configuration
77