Starting Up
6-10
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
6.6 Cold, Warm, and Hot Restarts with the Mode Selector Switch
Sequence of Events During a Warm or Hot Restart (CPU 412, 413, 414, and 416)
1. Turn the switch to the STOP setting.
Result: The STOP LED lights up.
2. Turn the switch to the RUN/RUNP setting.
Whether the CPU carries out a warm restart or a hot restart depends on the
position of the mode selector switch.
Sequence of Events During a Warm Restart (CPU 417 and 417 H)
1. Turn the switch to the STOP setting.
Result: The STOP LED lights up.
2. Turn the switch to the RUN/RUNP setting.
Sequence of Events During a Cold Restart (CPU 417 and 417 H)
1. Turn the switch to the STOP setting.
Result: The STOP LED lights up.
2. Turn the switch to the MRES setting and keep it at this setting.
Result: The STOP LED is dark for one second, bright for one second, dark for
one second and then remains lit.
3. Turn the switch to the RUN/RUNP setting.
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