Profinet System Redundancy - Siemens SINAMICS S120 Series Function Manual

Communication via PROFINET IO

5.9 PROFINET system redundancy

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.
152
Function Manual, 12/2018, 6SL3097-5BD00-0BP0
Communication