Siemens SIMATIC S7-1500 System Manual page 473

Test and service functions
15.1 Test functions
Test options
• Testing with program status
• Testing with breakpoints (only in the STARTUP (startup OB) or RUN-Solo system state)
• Testing with a watch table
• Testing with a force table
• Testing with a PLC tag table
• Testing with a data block editor
• Testing with the LED flash test
• Testing with a trace function
Testing with program status
The program status allows you to monitor the execution of the program. You can display the
values of operands and the results of logic operations (RLO). This allows you to detect and fix
logical errors in your program.
Note
Restrictions with the "Program status" function
Monitoring loops can significantly increase the cycle time. The increase in cycle time depends
on the following factors:
• The number of tags to be monitored
• The actual numbers of loops run through
Testing with program status
Testing with the "Program status" function can cause serious damage and injury if there are
functional disruptions or program errors.
Make sure that you take appropriate measures to exclude the risk of dangerous states
occurring before running a test with the "Program status" function.
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.
• You can only set breakpoints in the startup OB (OB 100) when the CPU is in STOP mode.
• You can only test with breakpoints with the primary CPU in the STARTUP (startup OB) or
RUN-Solo system state.
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WARNING
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF