Rules For The Assembly Of Fault-Tolerant Stations - Siemens SIMATIC PCS 7 System Manual

Operation
The operation of a CPU 410-5H requires a system expansion card. The system expansion
card specifies the maximum number of process objects that can be loaded to the CPU and
saves the license information in case of a system expansion. The system expansion card
forms a hardware unit with the CPU 410-5H. In redundant operation, two CPUs 410-5H must
have system expansion cards with the same number of POs.
2.5

Rules for the assembly of fault-tolerant stations

The following rules have to be complied with for a fault-tolerant station, in addition to the
rules that generally apply to the arrangement of modules in the S7-400:
● The CPUs have to be inserted in the same slots.
● Redundantly used external DP master interface modules or communication processors
must be inserted in the same slots in each case.
● External DP master interface modules for redundant DP master systems may only be
inserted in central controllers and not in expansion units.
● Redundantly used CPUs must be identical, which means they must have the same article
number, product version and firmware version. It is not the marking on the front side that
is decisive for the product version, but the revision of the "Hardware" component
("Module status" dialog mask) to be read using STEP 7.
● Redundantly used other modules must be identical, i.e. they must have the same article
number, product version and - if available - firmware version.
● Two CPUs 410-5H must have system expansion cards with the same number of POs.
CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 09/2014, A5E32631667-AB
2.5 Rules for the assembly of fault-tolerant stations
Introduction to CPU 410-5H
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