Siemens SIMATIC S7-400H - The S7-400 H Basic System; Figure 3-2 Hardware of the S7-400 H Basic System

S7-400H setup options
3.3 The S7–400H basic system
S7-400H
34 System Manual, 03/2012, A5E00267695-11
3.3 The S7–400H basic system
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 S7–400 standard modules. Restrictions only apply
to the function and communication modules; see Appendix Function modules and
communication pro
cessors supported by the S7-400H (Page 457).
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Figure 3-2 Hardware of the S7–400H basic system
Central processing units
The two CPUs are the heart of the S7-400H. Use the switch on the rear 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.
Rack for S7–400H
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 and UR2 are
available for this purpose.
Power supply
You require one power supply module from the standard range of the S7-400 for each
H-CPU, or to be more precise, for each of the two subsystems of the S7-400H.
To increase availability of the power supply, you can also use two redundant power supplies
in each subsystem. Use the power supply modules PS 405 R / PS 407 R for this purpose.
They can also be used together in redundant configurations (PS 405 R with PS 407 R).