Omron NT11S, Operation Manual

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Note
156
NT11S Internal Processing
Appendix F
APPENDIX F
NT11S Internal Processing
When host link/NT link is used, the following processing is executed inside the NT11S. Processing is divided into
two types: periodic processing and event processing.
Periodic Processing
When the NT11S is in the RUN mode it executes the following internal processing cyclically. The contents of all the
allocated bits and words used for screen display are read from the PC at one time, allowing high-speed processing.
The contents of the allocated bits and words registered
in the PC are all read at one time.
[NT11S processing] [Details of processing]
NT11S power ON
Initial processing
Hardware check, communication status check, etc.,
executed
Operation start
Initial values written to the memory tables
When the values registered in the NT11S are used as
the initial values in the memory tables, these values are
written into the allocated words of the PC.
Screen switching
Registration of the read allocated bits and words in the
PC
The allocated bits and words for the display
elements that have to be read from the PC are
registered in the PC.
Reading of allocated bits and words
(PT
®
PC)
(PT
®
PC)
(PT
¬
PC)
- Only the data of the PC Status Control Area and data for currently displayed
screens is read from the PC.
Even if the contents of the PC words allocated as memory tables are changed,
the data are not upgraded at the NT11S unless these memory tables are used
for screen displays.
- The maximum number of bits/words that can be read is 120 words per screen.
If the number that can be read is exceeded, the data are not upgraded.