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- Protects against communication failures arising from a fault in the double bus or in redundant rings
- Simplifies communication between a PC application and the SIMATIC S7-400H system
- Secures the investment thanks to the use of existing applications and flexible application options
- No additional programming overhead for the PC and in H systems
- Increases the availability of the PC application (e.g. PCS 7) thanks to redundant Layer 2 or Layer 3 communication