PLC Programming

4 - The Individual Components
To edit numerical values it is possible with the arrow keys or the Page Up/Down keys to change the
value by one or ten units respectively. A double click with the mouse also changes the value by
increasing by one unit. A typing check is installed for numerical values: + or +
deliver the lowest or the highest value respectively for the possible input values for the type of
parameter in question.
Quick check in the event of unsuccessful connection attempt to the gateway
You should make the following checks if the connection to the selected gateway computer is not
successful. (You get the message „not connected" in the Communication Parameters dialog behind
the gateway server address in the field Channels):
• Has the gateway server been started (the three-color symbol appears in the bottom right portion of
the toolbar)
• Is the IP address that you entered in the 'Gateway: Communication Parameters' dialog really that
of the computer on which the gateway is running (use „ping" to check)
• Is the TCP/IP connection working locally The error may possibly lie with TCP/IP.
'Online' 'Sourcecode download'
This command loads the source code for the project into the controller system. This is not to be
confused with the Code that is created when the project is compiled! You can enter the options that
apply to Download (time, size) in the 'Project' 'Options' 'Sourcedown ' dialog.
'Online' 'Create boot project'
With this command, the compiled project is set up on the controller in such a way that the controller
can load it automatically when restarted. Storage of the boot project occurs differently depending on
the target system. For example, on 386 systems three files are created: default.prg contains the
project code, default.chk contains the code's checksum, default.sts contains the controller status
after restart (start/stop).
The command 'Online' 'Create boot project' is also available in offline mode if the project has been
built without errors. In this case the following files are created in the projects directory:
.prg for the boot project code, and projektname>.chk for the checksum. These files
can be renamed as necessary and then be copied to a PLC.
Note:
If the project option Implicit at create boot project (category Sourcedownload) is activated, then
the selected sources will be loaded automatically into the controller on the command 'Online' 'Create
boot project'.
'Online' 'Write file to controller'
This command is used for loading any desired file onto the controller. It opens the dialog for 'Write file
to controller' in which you can select the desired file.
After the dialog is closed using the 'Open' button, the file is loaded into the controller and stored there
under the same name. The loading process is accompanied by a progress dialog.
With the command 'Online' 'Load file from controller' you can retrieve a file previously loaded on the
controller.
'Online' 'Load file from controller'
With this command, you can retrieve a file previously loaded into the controller using 'Online' 'Write file
to controller'. You receive the 'Load file from controller' dialog. Under Filename, provide the name of
the desired file, and in the selection window enter the directory on your computer into which it is to be
loaded as soon as the dialog is closed with the „Save" button.
CoDeSys V2.3 4-61