Siemens Simatic S7-1500R System Manual page 18

Example 2: Avoiding high system restart costs as a result of data loss
Automation task
A logistics company needs a matching automation solution for controlling the storage and
retrieval unit in a high-bay warehouse.
Feature
The failure of a controller would have serious consequences. After the system restart, you
would have to reposition the storage and retrieval units and record the content of the
containers again. The automation solution must ensure that no data is lost if a CPU fails and
that the warehouse can continue to operate.
Solution
To store goods in and retrieve them from the bays, the storage and retrieval unit moves
along an X, Y and Z axis. If the process is interrupted, data can be lost and the location of
the goods is not known. To guard against the loss of data, the storage and retrieval unit is
controlled by the S7-1500R redundant system.
Figure 2-2 Example: High-bay warehouse
Benefits
If one CPU fails, the second CPU maintains control of the process. The project data and the
user program are saved redundantly and are not lost if a CPU fails. Once you have replaced
the defective CPU and switched it to RUN, the redundant system automatically synchronizes
the project data with the user program in the new CPU. The solution saves you service time
and downtime costs for the warehouse.
S7-1500R/H redundant system
System Manual, 10/2018, A5E41814787-AA
2.1 What is the S7-1500R/H redundant system?
System overview
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