Siemens SIMATIC S7-1500 System Manual page 261

Test and service functions
14.1 Test functions
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
A test with the "Program status" function can cause serious damage to property or injury to
persons if there are functional disturbances 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.
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WARNING
SIMATIC Drive Controller
System Manual, 11/2019, A5E46600094-AA