Technical data

Testing Using Program Status
21.2 What You Should Know About Testing in Single-Step Mode/Breakpoints
Programming with STEP 7
470 Manual, 05/2010, A5E02789666-01
21.2 What You Should Know About Testing in Single-Step
Mode/Breakpoints
When testing in single-step mode you can do the following:
• Execute programs statement by statement (in single steps)
• Set breakpoints
The function "testing in single-step mode" is not possible for all programmable controllers (refer to
the documentation for the relevant programmable controller).
Requirements
• The test operation mode must be set. Testing in single-step mode is not possible in process
operation mode (see menu command Debug > Operation).
• Testing in single-step mode is possible only in Statement List. For blocks in Ladder Logic or
Function Block Diagram you must change the view using the menu command View > STL.
• The block must not be protected.
• The block must be open online.
• The opened block must not be changed in the Editor.
Number of Breakpoints
The number of breakpoints is variable and depends on the following:
• The number of breakpoints already set
• The number of variable statuses running
• The number of program statuses running
Refer to your programmable controller documentation to find out whether it supports testing in
single-step mode.
You will find the menu commands you can use to set, activate, or delete breakpoints in the "Debug"
menu. You can also select these menu commands using icons in the breakpoint bar. Display the
breakpoint bar using the menu command View > Breakpoint Bar.