Introduction to the CPU 410
2.4 The basic system for redundant operation
CPU 410 Process Automation/CPU 410 SMART
28 System Manual, 05/2017, A5E31622160-AC
You need a system expansion card for operation of a CPU 410. 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.
The basic system for redundant operation
Hardware of the basic system
The basic system consists of the hardware components required for a fault-tolerant
controller. The following figure shows the components in the configuration.
The basic system can be expanded with standard modules of the S7-400. There are
restrictions for the function modules and communication processors. See Appendix Function
and communication modules that can be used in a redundant configuration (Page 389).
Figure 2-4 Hardware of the S7-400H basic system
The two CPUs are the heart of the S7-400H. Use the switch
of the CPU to set
the rack numbers. In the following sections, we will refer to the CPU in rack 0 as CPU 0, and
to the CPU in rack 1 as CPU 1.
The UR2-H rack supports the installation of two separate subsystems with nine slots each,
and is suitable for installation in 19" cabinets.
You can also set up the S7-400H in two separate racks. The racks UR1, UR2, and CR3 are
available for this purpose.
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