Hmi Communication - Siemens SIMATIC ET 200AL System Manual

HMI communication

Properties
Using HMI communication, one or more HMI devices (for example HMI Basic/Comfort/Mobile
Panel) exchanges data with a CPU for operator control and monitoring with via the PROFINET
or PROFIBUS DP interface. The data exchange is via HMI connections.
If you want to set up several HMI connections to a CPU, use for example:
• The PROFINET and PROFIBUS DP interfaces of the CPU
• CPs and CMs with the relevant interfaces
Note
As of TIA Portal version V17, the TLS (Transport Layer Security) protocol is supported for
PG/HMI communication to secure the data exchange between PG/PC and CPU using
standardized security mechanisms.
For more information, refer to the following sections:
• Requirements for secure communication (Page 61)
• Secure PG/HMI communication (Page 92)
Procedure for setting up HMI communication
As soon as you drag-and-drop a tag, for example a tag from a global data block into an HMI
screen or into the HMI tag table, STEP 7 automatically sets up an HMI connection.
Alternatively, you can also set up the HMI connection yourself.
To set up an HMI connection, follow these steps.
1. Configure the HMI device in an existing configuration with a CPU in the network view of the
Devices & networks editor of STEP 7.
2. Select the "Connections" button and then "HMI connection" from the drop-down list.
3. Drag-and-drop a line between the end points of the connection (HMI device and CPU). The
end points are highlighted in color. If the required S7 subnet does not yet exist, it is created
automatically.
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Communication