Response To Snycup; Response To Primary-Backup Switchover - Siemens SIMATIC S7-1500 Function Manual

13.2

Response to Snycup

Response of communication connections via the system IP address in the system state SYNCUP
● HMI, PG- and S7-connections are temporarily closed. For a short time during the
SYNCUP it is not possible to establish connections to the S7-1500R/H redundant system.
● All existing connections of Open User Communication are interrupted:
– Connections set up by the CPUs of the redundant system as an active connection
– The S7-1500R/H redundant system sets up connection endpoints again for the
● The processing of running instances of the instructions TSEND and TRCV is stopped.
The block parameter STATUS returns 80C4
13.3

Response to primary-backup switchover

Response of communication connections via the system IP address during a primary-backup
switchover
● Running instances of the instructions TSEND and TRCV are stopped and return the
status 80C4
● Connections successfully established by the S7-1500R/H redundant system are
established again by the new primary CPU.
● The new primary CPU sets up connection endpoints again for the passive connection
establishment.
Note
Increased duration of connection interruption
If the remote system does not transmit actively after the primary-backup switchover, the
connection monitoring (e.g. TCP-Keep-Alive or application) may have to be performed by the
remote system until the connection can be re-established.
Communication
Function Manual, 11/2019, A5E03735815-AH
partner are set up again after the SYNCUP.
passive connection establishment after the SYNCUP.
(temporary communication error).
H
Communication with the redundant system S7-1500R/H
(temporary communication error).
H
13.2 Response to Snycup
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