Siemens SIMATIC S7-1500 System Manual page 262

Testing with breakpoints
With this test option, you set breakpoints in your program, establish an online connection,
and enable the breakpoints on the CPU. You then execute a program from one breakpoint to
another.
Requirements:
● Setting breakpoints is possible in the programming language SCL or STL.
Testing with breakpoints provides you with the following advantages:
● Localization of logic errors step by step
● Simple and quick analysis of complex programs prior to actual commissioning
● Recording of current values within individual executed loops
● Use of breakpoints for program validation also possible in SCL/STL networks within
LAD/FBD blocks
Note
Restriction during testing with breakpoints
• When you test with breakpoints, there is a risk of overwriting the cycle time of the CPU.
• If you are using technology objects and test them with breakpoints, the CPU switches to
STOP.
Note
F-System SIMATIC Safety
Setting breakpoints in the standard user program results in errors in the
security program:
• Sequence of F cycle time monitoring
• Error in communication with the fail-safe I/O
• Error during safety-oriented CPU-CPU communication
• internal CPU error
If you still wish to use breakpoints for testing, you must deactivate
the safety mode beforehand. This will result in the following errors:
• Error in communication with the fail-safe I/O
• Error during safety-oriented CPU-CPU communication
SIMATIC Drive Controller
System Manual, 11/2019, A5E46600094-AA
Test and service functions
14.1 Test functions
261