Mode Selector; Function Of The Mode Selector; Positions; Positions Of The Mode Selector - Siemens SIMATIC S7-400H Manual

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.
Figure 4-2
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.
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
RUN-P
RUN
STOP
MRES

Positions of the mode selector

Installation of a CPU 41x-H
4-11