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Here you find a way to connect redundant I/O devices to a S7-1500 controller. For this solution you can use blocks of the TIA Portal.
shipbuilding certificate, BV, SIMATIC S7-400 safety related 43377/A0 BV
Monitoring and automatic connection switchover for up to four lower-level connections based on the TCON blocks of Open User Communication.
EU Declaration of Conformity, SIMATIC S7 Sync-Modul for S7-1500H ( 6ES7960-1FB00-0AA5) EU FTLF1318P3BTL
EU Declaration of Conformity, SIMATIC S7 Sync-Modul for S7-1500H ( 6ES7960-1CB00-0AA5) FTLF8519P3BTLS31
If you are using UDP multicast messages with an S7-1500R/H system and the primary CPU fails in redundant mode, it might no longer be possible to access the S7-1500R/H system. This entry describes the reasons for this behavior and shows how you can avoid such a communication failure.
Various operating states of an S7-1500R/H system can be read out in the user program by a diagnostics block and made available.
The SIMATIC S7-1500 controller family has been extended by redundant CPUs for applications where controller availability is of greater importance.
S7-400 - Information for Hazardous substance restrictions identification marking (SJ/T 11364-2014)