Supplementary information
16.4 Configuring with STEP 7
CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 10/2013, A5E32631667-AA
219
● A fault-tolerant station may contain up to 20 expansion units.
● Assign racks with even numbers only to central controller 0, and racks with odd numbers
only to central controller 1.
● FMs and CPs can be operated only in racks 0 through 6.
● FMs and CPs are not permitted in switched I/O.
● Pay attention to the rack numbers for operation of CPs for fault-tolerant communication in
expansion units:
The numbers must be directly sequential and begin with the even number, e.g., rack
numbers 2 and 3, but not rack numbers 3 and 4.
● A rack number is also assigned for DP master no. 9 onwards if the central controller
contains DP master modules. The number of possible expansion units is reduced as a
result.
Compliance with the rules is monitored automatically by STEP 7 and considered accordingly
during configuration.
You can create the AS bundle configurations with the PCS 7 wizard.
Another way of achieving a redundant hardware configuration is to initially assemble
rack with all components to be implemented redundantly and to assign parameters to them.
The entire rack must then be copied and inserted. You adjust the network parameters
appropriately in the subsequent dialogs.
Special features in presenting the hardware configuration
In order to enable quick recognition of a redundant DP master system or PN/IO system,
each of them is represented by two parallel cables.
Assigning parameters to modules in a fault-tolerant station
Procedure
Assign all parameters of the redundant components identically, with the exception of
communication addresses.
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