Getting Started
3-3
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
3.2 Configuring Hardware and Starting Up the S7-400H
Installing Hardware
To configure the S7-400H as illustrated in Figure 3-1, perform the following steps:
ET 200M distributed I/O
S7-400H PLC
Rack 0 Rack 1
Figure 3-1 Hardware configuration
1. Configure the two subunits of the S7-400H PLC as described in the S7-400,
M7-400 Programmable Controllers, Hardware and Installation/Module
Specifications manuals. In addition, you must:
– Set the mounting rack number by means of the switches on the
synchronization submodules. The setting is applied by the CPU after
POWER ON and a subsequent memory reset by means of the mode
selector. If the mounting rack number is not set correctly you will not have
online access and the CPU will not run in certain circumstances.
– Insert the synchronization submodules into the CPUs. Then screw up the
additional front bezels to activate them (refer to S7-400, M7-400
Programmable Controllers, Hardware and Installation).
– Connect the fiber-optic cables (always connect the two upper
synchronization submodules and the two lower synchronization submodules
of the CPUs). Lay the fiber-optic cable so that it is protected from any
damage.
Make sure with the route wires in addition that the two fiber-optic cables are
always laid so that they are isolated from each other. Laying them separately
enhances their availability and protects then from potential dual faults in the
event, say, of simultaneous interruption of the fiber-optic cables.
In addition, make sure that the fiber-optic cables are plugged into the two
CPUs before turning on the power supply or turning on the system. If they
are not, the two CPUs might both process the user program as master
CPUs.
2. Configure the distributed I/O as described in the ET 200M Distributed I/O
Device manual.
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