Influences On The Cycle Time In Syncup System State - Siemens Simatic S7-1500 Function Manual

5.3.2

Influences on the cycle time in SYNCUP system state

SYNCUP system state
In SYNCUP system state, the primary CPU is in RUN-Syncup operating state. The backup
CPU is in SYNCUP operating state. The task of the SYNCUP system state is to synchronize
the data of both CPUs so that the CPUs can subsequently work redundantly.
Influence on the cycle time
The figure below shows the chronological behavior of primary CPU and backup CPU during
the SYNCUP system state.
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②
③
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Figure 5-1
Cycle and response times
Function Manual, 10/2018, A5E03461504-AD
5.3 Influences on the cycle time of the S7-1500R/H redundant system
Synchronization of data from the primary CPU to the backup CPU
Copying the load memory and terminating the asynchronous instructions
Snapshot of the work memory contents
Transfer of the work memory contents to the backup CPU
Backup CPU makes up the time lag to the primary CPU
Effects of the SYNCUP on the cycle times of the CPUs
Cycle and response times of the S7-1500R/H redundant system
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