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Introduction to CPU 410-5H
2.4 The basic system for redundant operation
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, UR2, and CR3 are
available for this purpose.
Power supply
You require a power supply module from the standard system range of the S7-400 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. In this case, you use the power supply modules PS 405 R / PS 407 R.
A combination of these can also be used in redundant configurations (PS 405 R with PS 407
R).
Synchronization modules
The synchronization modules are used to link the two CPUs. They are installed in the CPUs
and interconnected by means of fiber-optic cables.
Two types of synchronization modules are available:
● Synchronization modules for synchronization cables up to 10 meters long
● Synchronization modules for synchronization cables up to 10 kilometers long
You must use 4 synchronization modules of the same type in a fault-tolerant system. For a
description of the synchronization modules, refer to the section Synchronization modules for
the CPU 410-5H (Page 181).
Fiber-optic cable
The fiber-optic cables are used to interconnect the synchronization modules for the
redundant link between the two CPUs. They interconnect the upper and lower
synchronization modules in pairs.
You will find the specification of the fiber-optic cables you can use in an S7-400H in the
section Selecting fiber-optic cables (Page 187).
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CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 10/2013, A5E32631667-AA
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