Technical data

Establishing an Online Connection and Making CPU Settings
18.1 Establishing Online Connections
Programming with STEP 7
406 Manual, 05/2010, A5E02789666-01
Using the menu command PLC > Access Rights > Setup, you can call the "Enter Password"
dialog box directly. By doing this, for example at the beginning of a session, you can enter the
password once and will no longer be queried during later online accesses. The password remains
effective until either the SIMATIC Manager is closed or the password is cancelled with the menu
command PLC > Access Rights > Cancel.
CPU Parameter Remarks
Test operation/process
operation
(not for S7-400 or CPU
318-2)
Can be set in the "Protection" tab.
In process operation, test functions such as program status or monitor/modify
variables are restricted so that the set permissible scan cycle time increase is not
exceeded. This means, for example, that no call conditions are allowed in program
status and the status display of a programmed loop is interrupted at the point of
return.
Testing using breakpoints and single-step program execution cannot be used in
process operation.
In test operation, all test functions via programming device/PC even if they cause
considerable increases to the scan cycle time can be used without restrictions.
Protection level Can be set in the "Protection" tab. (Note: If your CPU is set to protection level 1 and
your CPU makes SFC 109 "PROTECT" available, you can switch between protection
levels 1 and 2 with this SFC.) You can make write or read/write access to the CPU
dependent on knowing the correct password. The password is set in this tab.
If you attempt to load a block on an M7 module when the mode selector switch is set to RUN, the
"Enter Password" dialog opens with the message: "Module <xxx> is protected by a password". This
message does not apply to M7 modules with M7-SYS RT < V5.0.
In this case, follow the steps below:
1. Close the dialog with "Cancel".
2. Set the mode selector switch to STOP or RUN-P.
3. Start the required function again.