Basics of program execution
10.4 Special instructions for S7-1500R/H redundant systems
S7-1500R/H redundant system
330 System Manual, 01/2024, A5E41814787-AF
Example: Disabling/enabling SYNCUP for a baggage handling system
Automation task
A baggage handling system at an airport is used to distribute pieces of baggage. When a
flight lands, all baggage is loaded onto the baggage handling system. The baggage passes
through a scanner at high speed. The scanner checks the destination of the baggage:
• If a piece of baggage has reached its destination airport, the baggage handling system
forwards it directly to baggage claim.
• If a piece of baggage has not reached its final destination, the system immediately
redirects it towards the connecting flight.
Figure 10-3 Airport baggage handling system
To ensure high availability for the baggage handling system, you use an S7-1500R/H
redundant system as controller. If one of the CPUs fails (loss of redundancy), the S7-1500R/H
redundant system switches from the RUN-Redundant system state to RUN-Solo. A CPU
continues to ensure the control of the baggage handling system, but no second redundant
CPU is available.
Replace the failed CPU with a replacement CPU. The procedure for replacing the CPU is
described in the section Replacing defective R/H-CPUs (Page 446).
As soon as you set the exchanged CPU to RUN, the R/H-System responds as follows:
• The replaced CPU (Backup CPU) switches to SYNCUP operating state and sends a
corresponding status message to the primary CPU.
• The primary CPU then switches from the RUN operating state to RUN-Syncup.
• The S7-1500R/H redundant system then does a SYNCUP.
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