Using Legacy Pg/Pc Communication For Tia Portal - Siemens SIMATIC ET 200AL System Manual

Comfort Panels, Mobile Panels 2nd Generation
1. Open the file manager via the Windows CE desktop icon "My Device".
2. Navigate to the directory "\flash\simatic\SystemRoot\OMS\Untrusted". There you will find the
PLC communication certificate of the CPU.
3. Copy the PLC communication certificate of the CPU to the directory
"\flash\simatic\SystemRoot\OMS\Trusted".
4. Restart the HMI runtime software.
When the PLC communication certificate is already available on the HMI device with the
"trustworthy" status, secure HMI communication can be set up. You can find additional
information in the operating instructions of the HMI device.
3.6.4.6

Using Legacy PG/PC communication for TIA Portal

As of TIA Portal version V17, the TIA Portal and the S7-1200/S7-1500 CPU as of firmware
version V4.5/V2.9 automatically communicate "securely" - the connection partners set their
connection mechanisms automatically to the highest possible security method.
Only special circumstances (see Information about compatibility (Page 102)) cause a fallback
to the old PG/PC communication, called "Legacy PG/PC communication".
There may be some cases in which the higher security is not desirable because it can impact
the transmission rate of CPUs with weak communication performance.
Requirement
• There may be no online connections to the CPUs.
• For CPUs that are to be reached online, the option "Only permit secure PG/PC and HMI
communication" must be disabled (CPU parameters in the area "Connection
mechanisms").
• The communication partners are in a protected environment, for example, during the
commissioning phase.
Setting the Legacy PG/PC communication
1. In the "Online" menu, select the command "Use only Legacy PG/PC communication".
2. Select the check box in front of the menu command.
Result: All online connections are set up as for TIA Portal versions < V17.
The setting remains active for the duration of the session. When you open a project, the
option "Use only·Legacy PG/PC communication" is not set.
Communication
Function Manual, 05/2021, A5E03735815-AJ
Communications services
3.6 Secure Communication
101