Siemens Simatic S7-400 - Manual (Page 437)

CPUs for M7-400
11-9
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
11.3.3 Mode Selector Switch
Mode Selector Switch
The mode selector switch of the CPUs is a keyswitch.
You can see the positions of the mode selector switch in the following figure.
MRES
STOP
RUN
RUN-P
Figure 11-3 Mode Selector Switch
Positions of the Mode Selector Switch
The positions of the mode selector switch are explained in Table 11-5 in the order
in which they are arranged on the CPUs.
Table 11-5 Positions of the Mode Selector Switch
Position of
the Mode
Selector
Switch
Explanations
RUN-P The CPU executes the user program.
The key cannot be removed in this position.
Write and read access to the CPU are possible.
RUN The CPU executes the user program. Read access only to the CPU is
possible.
The key can be removed in this position to prevent any unauthorized
persons from changing the operating mode.