Omron NT30 Operation Manual page 278

NT30/30C Internal Processing
Event Processing
When the status of the NT30/30C changes during operation, the processing for writing the changed data to the
relevant area of the PC memory is executed.
This kind of processing is only executed when statuses change. When changes occur simultaneously, processing
is executed in accordance with the order of priority.
NT30/30C Processing
High
Writing to the PT status notify area
Bit writing
Writing to numeral memory tables
Low Writing to character string memory table
Data is only written to PC bits and numeral/character string memory table entries for elements in screens currently
being displayed. If the contents of numeral/character string memory table entries that are not being displayed
change, the changed contents are not written to the PC.
Details of Processing
Writing to the PT status notify area in order to
(PT→PC)
inform the PC of changes in the PT operating
status.
Writing to bits in order to inform the PC that a
(PT→PC)
touch switch and an B7A Unit has been pressed.
Changing the contents of words allocated to the PC
(PT→PC)
when the value in a numeral memory table has
changed.
Changing the contents of words allocated to the PC
(PT→PC)
when the value in a numeral memory table entry
has changed.
Appendix D
269