Siemens SINAMICS S150 NEMA Operating Instructions Manual page 367

6.9.4 PROFINET system redundancy
6.9.4.1 Overview
Redundant systems can be created when using the SINAMICS PROFINET Control Unit
CU320-2 PN.
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.
Preconditions
● SIMATIC controller S7-400H with two PROFINET H-CPUs type 41xH
● SINAMICS drive with a PROFINET Control Unit (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 system redundancy.
● Maximum 2 cyclic PROFINET connections.
● System redundancy is only possible via the onboard interface of SINAMICS PROFINET
Control Unit (CU320-2 PN)
● For the duration of switching from one controller to the other, the setpoints of the last
connection remain frozen and valid.
Converter cabinet units
Operating Instructions, 11/2017, A5E36652151A
6.9 Communication via PROFINET IO
Operation
365