Technical data

Testing with the Variable Table
20.8 Forcing Variables
Programming with STEP 7
462 Manual, 05/2010, A5E02789666-01
20.8 Forcing Variables
20.8.1 Safety Measures When Forcing Variables
Beware of Injury to Personnel and Damage to Property
Note that when using the "Force" function, any incorrect action could:
• Endanger the life or health of personnel or
• Cause damage to machines or the whole plant.
!
Caution
Before you start the Force function you should check that nobody is executing this function on the same CPU at
the same time.
A Force job can only be deleted or terminated with the menu command Variable > Stop Forcing. Closing the
force values window or exiting the "Monitoring and Modifying Variables" application does not delete the force job.
Forcing cannot be undone (for example, with Edit > Undo).
Read the information on the Differences between Forcing and Modifying Variables.
If a CPU does not support the Force function, all menu commands in the Variable menu linked with forcing are
deactivated.
If the output disable is deactivated with the menu command Variable > Enable Peripheral Output, all forced
output modules output their force value.