As Ron stated in his post you need these tags.
Seconded
The "C" tags are used to store the "setup" of the module. When you add a module and can configure any settings for the module these settings are stored in the Config tags. You can also monitor and change these tags from an HMI if needed.
Changing data in "C" tags will have no effect until the processor re-connects with the module, because the "C" tag is written once only, to create the "Connection" to the module.
If you have to dynamically change a module's configuration you must then issue a "Module Configuration" Message (MSG) to force the processor to re-download the "C" tag.
The "I" tags are used as virtual inputs that can be used in the program to monitor for any fault conditions of the module
"I" tags are for any data that the module must transmit to the processor, such as Input data from Input modules, and Status data.
Other types of modules may have more of these tags depending on the features of the modules.
There are only 3 types of tags, "C", "I", and "O".
They are created automatically when you add the module to the I/O Configuration, and what you get will depend on the type of module you add.
Some have all 3, such as an Analog Output module, which needs "C" for the module's configuration", "I" for channel status information, and "O" for the channel Output data.
A Digital Input module typically only has an "I" tag, containing the Input Data, as there is no data to transfer
to the module, and no configuration needed.
Rest assured that the tags are there for a reason, and you cannot delete them.
