Syncup System State - Siemens SIMATIC S7-1500 System Manual

Commissioning
11.4 Operating and system states
hardware interrupts, diagnostic interrupts and communication can interrupt the cyclic
program flow and prolong the cycle time.
If you have configured a minimum cycle time, the CPU does not terminate the cycle until after
this minimum cycle time has expired, even if the user program is completed sooner.
The operating system monitors the runtime of the cyclic program on the basis of a
configurable upper limit known as the maximum cycle time. You can restart this time
monitoring at any point in your program by calling the RE_TRIGR instruction.
If the cyclic program exceeds the maximum cycle time, the operating system may start the
time error OB (OB 80). You can find additional information in the section Start events (Page
220).
Points to note in the RUN operating state
In non-redundant operation, the CPUs are independent of each other. They can have different
projects.
RUN-Syncup operating state
In the RUN-Syncup operating state, the backup CPU synchronizes with the primary CPU. The
SYNCUP that temporarily affects the primary CPU (for example delay of asynchronous
services, cycle time extension through transfer of the load and work memory contents) runs
simultaneously in the backup CPU. You can find more information in the section SYNCUP
system state (Page 270).
RUN-Redundant operating state
The redundant system is in the RUN-Redundant system state. Both CPUs process the user
program synchronously.
11.4.6

SYNCUP system state

Requirements
• The article numbers and firmware versions of the two CPUs are the same.
• There is a SIMATIC memory card in each CPU.
• The PROFINET ring is closed.
• There is at least one redundancy connection (fiber-optic cable) in the S7-1500H redundant
system.
• Media redundancy role in the PROFINET ring:
– The two CPUs have the media redundancy role "Manager (auto)".
– All other devices in the PROFINET ring have the media redundancy role "Client".
• Pairing for the two CPUs has been implemented.
• The primary CPU is in the RUN operating state.
• The execution of SYNCUP is not disabled (default setting).
270
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD