Installation of a CPU 41x-H
4-11
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
4.4 Mode Selector
Function of the Mode Selector
Using the mode selector, you can put the CPU in RUN/RUN-P or STOP mode or
reset the memory of the CPU. STEP 7 offers further options for changing the
mode.
Positions
The mode selector switch is designed as a keyswitch. Figure 4-2 illustrates the
possible positions of the mode selector.
RUN-P
RUN
STOP
MRES
Figure 4-2 Positions of the mode selector
Table 4-2 explains the positions of the mode selector. In the event of a fault or if
there are startup problems, the CPU will go into or remain in STOP mode
irrespective of the position of the mode selector.
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