Installation of a CPU 41x-H
4-12
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
Table 4-2 Positions of the mode selector
Position
Explanation
RUN-P If there are no startup problems or errors and the CPU was able to go into RUN, the CPU
executes the user program or runs with no load. It is possible to access the I/O. The key
cannot be removed in this position.
Programs can:
• Be read out with the programming device from the CPU (CPU programming device)
• Be transferred to the CPU (programming device CPU).
RUN If there are no startup problems or errors and the CPU was able to go into RUN, the CPU
executes the user program or runs with no load. It is possible to access the I/O. The key
can be removed in this position to ensure that the mode cannot be changed without
authorization.
Programs in the CPU can be read out with the programming device (CPU % programming
device).
The program in the CPU cannot be changed when the switch is in the RUN position.
(See STEP 7.) The protection level can be bypassed using a password set in
STEP 7/HWCONFIG (STEP 7 V4.02 and above). In other words, if you use this
password, the program can also be changed when the switch is in the RUN position.
STOP The CPU does not process the user program. The digital signal modules are disabled.
The key can be removed in this position to ensure that the operating mode cannot be
changed without authorization.
Programs can:
• Be read out with the programming device from the CPU (CPU programming device)
• Be transferred to the CPU (programming device CPU).
MRES
(Master
Reset)
Momentary-contact position of the key switch for the master reset of the CPU and for cold
restart (see the following pages).
Protection Levels
A protection level can be defined in the CPUs of the S7-400 that can be used to
protect the programs in the CPU from unauthorized access. You can determine
with the protection level which programming device functions a user can execute
on the CPU in question without particular authorization (password). You can
execute all the programming device function using a password.
Setting the Protection Levels
You can set the protection levels (1 to 3) for a CPU under STEP 7/Configuring
Hardware.
You can remove the protection level set under STEP 7/Configuring Hardware using
a manual reset with the mode selector.
You can also set protection levels 1 and 2 using the mode selector. Table 4-3 lists
the protection levels of a CPU of the S7-400.
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