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This function will read a selected option from a selection field on a received form.
Note that the received form is only valid after a "Form received" event is raised; the event will not be removed until the navFormReceiveDone function is called.
To read all the selected options of a field with multiple selections, call this function with incrementing index until all the selected options have been found.
id : DINT (1..2147483647)
ID of the field to read.
index : INT (1..30)
Index of the option to read.
option : DINT
The id of a selected option.
FUNCTION navFormReceiveReadSelect : INT;