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 released up to version 4.7
- S7-1500 series from firmware version V2.9, tested and released up to version 4.0
- S7-ET200SP series from firmware version V2.9, tested and released up to version 4.0
Note: When using the older legacy access for communication with a simulated controller, no password must be assigned. This restriction does not apply when using dedicated hardware controllers.
