Siemens Simatic S7-1500/ET 200MP System Manual page 304

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) allowing you to recognize and
fix logical errors in your program.
Note
Restrictions with the "Program status" function
The monitoring of loops can increase the cycle time significantly, depending in each case on
the number of tags to be monitored and on the actual number of loops processed.
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 no dangerous situations can arise before you conduct a test with the
"Program status" function.
Automation system
System Manual, 12/2017, A5E03461182-AE
WARNING
Test functions and fault resolution
15.1 Test functions
303