Communication via PROFINET IO
5.9 PROFINET system redundancy
Communication
152 Function Manual, 12/2018, 6SL3097-5BD00-0BP0
5.9 PROFINET system redundancy
5.9.1 Overview
Thanks to SINAMICS S120 PROFINET Control Unit, the assembly of system-redundant
systems is possible.
Precondition for system-redundant systems is a so-called H-system. The H-system consists
of 2 fault-tolerant controls – master and reserve CPU – which are constantly synchronized
via fiber-optic cables. If one controller fails, the other automatically takes on the job. This
reduces system downtimes.
Requirements
● SIMATIC controller S7-400H with two PROFINET H-CPUs type 41xH (or newer: e.g.
SIMATIC S7-1500 R/H)
● SINAMICS S120 PROFINET Control Unit (CU310-2 PN or CU320-2 PN)
● Redundant communication links
Benefits
● No system downtime in the case of a controller failure
● Component replacement possible during ongoing operation
● Configuration changes possible during ongoing operation
● Automatic synchronization after replacing components
Restrictions
● IRT is not supported
● No simultaneous operation of Shared Device and Shared I-Device
● Maximum 2 cyclical PROFINET connections
● System redundancy only via the onboard interface of SINAMICS S120 PROFINET
Control Unit
● For the duration of switching from one controller to the other, the setpoints of the last
connection remain frozen and valid.
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