S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03
12-1
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In view of the many and versatile S7-300 applications, this chapter can only
describe the basic rules on its electrical configuration. You must observe at least
these basic rules if you want your S7-300 to operate free of trouble.
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EMERGENCY-OFF devices to IEC 204 (corresponds to VDE 113) must remain
effective in all operating modes of the plant or system.
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The following table shows you what you have to observe when starting up a plant
again following specific events.
Table 12-1 Starting the system after specific events
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Restart following a voltage dip or power
failure,
No dangerous operating states may occur. If
necessary, force EMERGENCY-OFF.
Start-up after releasing the EMERGENCY
OFF device:
An uncontrolled or undefined start-up must
be avoided.
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