Siemens Simantic ET200SP System Manual page 263

Testing with PLC tag table
You can monitor the data values that tags currently assume in the CPU directly in the PLC
tag table. To do this, open the PLC tag table and start monitoring.
Additionally, you have a possibility of copying PLC tags to a monitoring or force table and of
monitoring, controlling or forcing them there.
Testing with data block editor
Various possibilities of monitoring and controlling tags are at your disposal in the data block
editor. These functions directly access the current values of the tags in the online program.
Current values are the values that the tags assume at the current time during program
execution in the CPU's work memory. The following functions for monitoring and control are
possible via the data block editor:
● Monitoring tags online
● Controlling individual actual values
● Creating a snapshot of the actual values
● Overwriting actual values with a snapshot
Note
Setting data values during commissioning
During commissioning of a system, data values often have to be adjusted to optimally adapt
the program to the general conditions prevailing locally. To this end, the declaration table
offers a few functions for data blocks.
Testing with the LED flash test
In many online dialogs, you can perform an LED flash test. This function is useful, for
example, when you are not sure which device in the hardware configuration corresponds to
the device currently selected in the software.
When you click the "Flash LED" button, an LED flashes on the currently selected device. In
the case of the CPU, the RUN/STOP, ERROR and MAINT LEDs flash. They flash until you
cancel the flashing test.
Testing with trace function
The trace function is used to record the CPU tags, depending on the settable trigger
conditions. Tags are, for example, the drive parameters or system and user tags of a CPU.
The CPU saves the recordings. You can display and evaluate the recordings with STEP 7, if
necessary.
The trace function can be called from the CPU's folder in the project tree, under the name
"Traces".
In connection with trace functions, also pay attention to the following FAQ on the Internet
(https://support.industry.siemens.com/cs/ww/en/view/102781176).
Distributed I/O system
System Manual, 12/2016, A5E03576849-AG
Test functions and eliminating problems
13.1 Test functions
263