Programming
Fail-Safe Systems
5-42 A5E00085588-03
7. If the password is entered correctly, a further request is made (next step); if the
password is invalid, safety mode is not switched off and remains active.
8. Confirm that safety mode is to be deactivated with OK.
Result: Safety mode is deactivated.
You can then download changes to the Safety Program to the CPU during
operation (RUN).
5.4.3 Activating Safety Mode
After you have downloaded the changes, you must activate safety mode again to
guarantee the safe execution of the Safety Program.
Procedure
1. Select the CPU or its S7 program in SIMATIC Manager.
2. Choose the Options > Edit Safety Program menu command.
3. Select the online view in the dialog box that appears.
4. Enter the CPU password, if it is requested.
5. Check whether "Inactive" is displayed in the "Safety Mode" text box. If yes,
continue to the next step; if not, terminate the procedure because safety mode
is already active.
6. Click the "Safety Mode" button.
7. Confirm that safety mode is to be activated again with OK.
Result: Safety mode is activated again and "Active" is displayed in the "Safety
Mode" box.
Note
If you are unable to reactivate safety mode using the procedure described, either
switch the line voltage off and then on or switch the CPU to STOP and then to
RUN.
Note on Activation or Deactivation of Safety Mode
The F_TESTM block sets the TEST output when safety mode is deactivated. In
addition, it is recommended that the safety mode status is indicated on the OS by
means of the TEST output parameter of the F_TESTM.
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