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A Quick Recap
In Step7, Offline refers to the program in the computer, and Online refers to the program in the PLC
Let me first start with the Offline program and try to go online to CPU
Establish a connection with PLC to which you are connected
The green rectangle with Run' shows we are able to Monitor the PLC or download/upload something to/from PLC
For example, we can Monitor the running logic to read the timer values
Being in Monitor mode, the toolbar is highlighted
This new window, shows the program in the PLC
Notice there are many SFBs and FCs specific to this CPU in addition to the main program, i.e., OB1
Go to the online ladder logic
Now try to Monitor the running program