Omron V022-E3-1 Appendix, NT600S Internal Processing, NT600S PT processing, Details of processing

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APPENDIX I

NT600S Internal Processing

When Host/NT link or C200H direct is used, the following processing is executed inside the NT600S. Processing is divided into two types: periodic processing and event processing.

Periodic Processing (When Using Direct Connection)

The following processing is executed inside the NT600S to enable high-speed control from the PC.

Usually, the only data read from the PC area the elements used for the currently displayed screen. Even if the con- tents of the PC words allocated to memory tables are changed, these contents are not updated at the PT unless the memory table is used for the displayed screen.

[NT600S (PT) processing] [Details of processing]

PT power ON

Initial processing

Operation start

Initial values written to the memory tables

Screen switching

Screen element registration

elementsReading of registered	(PT ￿PC)
Reading of elements
that could not be	(PT ￿PC)
registered.
Reading of the
elements that could not	(PT ￿PC)
be registered.
controlReadingareathe PT status	(PT ￿PC)
Reading of elements
that could not be	(PT ￿PC)
registered
Reading of elements
that could not be	(PT ￿PC)
registered
statusReadingcontrolof theareaPT	(PT ￿PC)

	Hardware check, communication status check, etc., executed.
	When the values registered in the NT600S are used as the
(PT ￿PC)	initial values in the memory tables, these values are written into
	the allocated words of the PC.
	In order to enable fast batch processing, the elements used in
(PT ￿PC)	the displayed screen are registered in the PC in advance.
	Approximately 120 words can be registered per screen.
	The statuses of the registered elements are read from the PC
	and the display is changed.
	The status of the elements that were in excess of the registrable
	number and could not be registered is read from the PC, and
	the display is changed. This processing is continued until the
	statuses of all the remaining elements has been read.

If the number of elements that could not be registered is large, the PT status control area is read after every two element readings.

: Processing performed if necessary

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