There are two types of access for symbolic access to S7 controllers: legacy access and encrypted access via secure communication.
Legacy access is necessary for control systems that were programmed with TIA before version 16 or have an older firmware version. Encrypted secure communication using TLS1.3 can be used for newer controllers.
The following requirements exist for encrypted secure communication using TLS1.3:
- The controller software must have been created with at least TIA version 17.
- If software components were created with an earlier version, they must be recompiled and transferred with TIA version 17 or higher. The same applies to the hardware configuration of the PLC.
- At least the following firmware versions are required:
- S7-1200 series with firmware versions V4.5, tested and approved up to version 4.7 [TIA V21]
- S7-1200 G2 series with firmware versions V4.0, tested and approved up to version 4.1 [TIA V21]
- S7-1500 series from firmware version V2.9, tested and approved up to version 4.1 [TIA V21]
Folgende Voraussetzung gibt es für den unverschlüsselten Legacy Zugriff:
- At least the following firmware versions are required:
- S7-1200 series with firmware versions V4.5, tested and approved up to version 4.7 [TIA V21]
- S7-1500 series from firmware version V2.1, tested and approved up to version 4.1 [TIA V21]
Notes:
When using the older legacy access to communicate with a simulated controller, no password may be assigned. This restriction does not apply when using dedicated hardware controllers.
Tested and approved within the specified firmware versions. Older or newer versions have not been tested; functionality cannot be guaranteed.
Depending on the firmware version, legacy access must be explicitly enabled in the controller.
