Test and service functions
15.1 Test functions
Automation system
330 System Manual, 01/2023, A5E03461182-AK
-System SIMATIC Safety
Setting breakpoints in the standar
d user program results in errors in the safety 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 nevertheless want to use breakpoints for testing, you must disable safety mode. This
will result in the following errors:
Error in communication with the fail-safe I/O
Error during safety-oriented CPU-CPU communication
Testing with watch tables
The following functions are available in the watch table:
• Monitoring of tags
You can use the watch tables to monitor the current values of the individual tags of a user
program or a CPU on the programming device/PC, on the display of the CPU, and on the
web server. A symbolic name for the tags must be specified in the "Name" column of the
watch table to allow the display of the CPU and the web server to show the value of the
tags.
You monitor the following operand areas:
– Inputs and outputs (process image) and bit memory
– Contents of data blocks
– Peripheral inputs and peripheral outputs
– Timers and counters
• Modifying tags
Use this function to assign fixed values to the individual tags of a user program or CPU on
the PG/PC. Modifying is also possible with Test with program status.
The following operand areas are modifiable:
– Inputs and outputs (process image) and bit memory
– Contents of data blocks
– Peripheral inputs and peripheral outputs (for example, %I0.0:P, %Q0.0:P)
– Timers and counters
• "Enable peripheral outputs" and "Modify now"
These two functions enable you to assign fixed values to individual peripheral outputs of a
CPU in the STOP mode. You can also use them to check your wiring.
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