Omron NT-series Programmable Terminal V022-E3-1 - Manual (Page 172)

Reference
Reference

   
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Section 5-1
Notifying the NT600S Status by Using Allocated Bits and Words ..... PT Status Notify Area (PT to PC)
The PT status notify area (PT to PC) is provided to notify the NT600S status
changes to the PC. When any NT600S status has changed, such change is written
to this area in the PC, and the PC will read the data from this area to check the
NT600S status.
The PT status notify area is configured as three consecutive words as shown be-
low.
0
0 0
The first word (word m) of the PT status notify area must be set with the support
tool.

Currently displayed screen (refer to page 162)
The screen number displayed on the NT600S is written to this word.
Simultaneously, the PT status screen switch strobe flag is set to ON (1). After
this is notified to the PC, this flag reverts to OFF (0). Checking the status of this
flag will provide a simple method of checking if the NT600S display has
switched.
 Content upgrade memory table (refer to page 189)
The number of the numeral table is written to the word when the numeral
memory table contents change due to the touch switch operation on the
NT600S.
The contents of the word to which the numeral table has been allocated also
change.
Word 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Bit
Screen # (4-digit BCD) Screen being displayed
Content upgrade
memory table
Numeral memory table # (3-digit BCD)
PT status PT status
m
m+1
m+2