Omron NT20S Operation Manual page 273

NT20S Internal Processing
Event Processing (When Using Direct Connection)
When the status of the NT20S 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, the proces-
sings are executed in accordance with the order of priority.
[NT20S processing]
High
Writing to PT status notify area
Bit writing
Writing to numeral memory tables
Writing to character string memory tables
Low
Data is only written to PC bits and numeral/character string memory tables for elements in screens currently being
displayed. If the contents of numeral/character string memory tables that are not being displayed change, the
changed data is not written to the PC.
254
Writing to the PT status notify area in order to inform the PC
(PT ³ PC)
of changes in the PT operation status.
Updating the contents of words allocated to the PC when the
(PT ³ PC)
value in a numeral memory table has changed.
Updating the contents of words allocated to the PC when the
(PT ³ PC)
contents of a character string memory table have changed.
Writing to bits in order to inform the PC of touch switch
(PT ³ PC)
statuses.
[Details of processing]
Appendix E