Siemens SIMATIC S7-1500 System Manual page 272

Commissioning
11.4 Operating and system states
Preparing the SYNCUP system state
After SYNCUP starts, the CPUs prepare SYNCUP:
• The backup CPU switches to SYNCUP operating state and sends a status message to the
primary CPU.
• The primary CPU then switches from the RUN operating state to RUN-Syncup.
The current operating states are shown on the displays:
Table 11-5 Preparing SYNCUP
Sequence of the SYNCUP system state
The operating systems of the two CPUs run through SYNCUP in five phases:
• Copying the SIMATIC memory card
• Restart of the backup CPU
• Finishing tasks
• Copying the work memory
• Making up backup CPU lag
The display of the primary CPU shows you the current phase of the SYNCUP system state.
The display of the backup CPU shows "Connect..." state during the phases
RUN-Redundant system state is reached.
272
Primary CPU
RUN-Syncup
Overview
CPU 1517H-3 PN
X1: 192.168.0.1
X2: 192.168.1.1
[Primary]
6ES7 517-3HP00-0AB0
②
③
④
⑤
SYNCUP
CPU 1517H-3 PN
X1: 192.168.0.1
X2: 192.168.1.1
V3.0 [Backup]
OK
①
Backup CPU
Overview
6ES7 517-3HP00-0AB0
② ⑤
to
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD
V3.0
OK
until the