In the following you will map a device output to a global implicit variable, which you recently create for this purpose directly in the “I/O Mapping” dialog.
The “I/O Mapping” dialog is thus a further place for declaring a global variable.
Requirement: A device that supports an I/O mapping configuration in CODESYS is inserted in the device tree of your project. On the ⮫ I/O Mapping tab in the device editor you will thus see a tabular display of the input and output channels of the device with specification of the addresses and data types.
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To open the device editor, double-click the device object in the device tree, and then the “<device name> I/O Mapping” tab.
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Click in the mapping table on a channel entry in the “Variable” column in order to open an input field.
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Specify a simple name (without "
.") for a new variable (example:myBool).CODESYS creates the variable as an implicit global variable in the project and assigns it directly to the channel address. Therefore in this case the address does not appear struck through as in the case of mappings to existing variables
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