9/26/2014 1:31 PM | |
Joined: 11/21/2007 Last visit: 8/12/2024 Posts: 2325 Rating:
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Hello YogendraG The Attached Document Explains the difference. Here is a short extract : System redundancy Requirement for realizing the system redundancy is the application of an H system. The H system consists of two fault-tolerant controllers (master and reserve CPU). If one H-CPU fails, the other automatically takes over.System redundancy is a connection of IO devices via PROFINET (PN devices), for which there is a communication connection between each PN device and each of both H-CPUs. The IO devices need to support the system redundancy; otherwise, they can be operated in the same network, however only one of both H-CPUs can be assigned (unilateral periphery). The used topology (line, star, ring) plays no role for the system redundancy. This distinguishes the system redundancy from the media redundancy. System redundant periphery is often also referred to as switched I/O. This does not refer to the fault tolerance between I/O groups or systems. Media redundancy Media redundancy ensures the network availability and contributes to increasing the plant availability. The ring topology is used here. The media redundancy protocol (MRP) ensures that when one transmission path fails, an alternative communication path is available.
Attachment66644434_H_Configurations_V12_en.pdf (2383 Downloads) |
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