Omron NT620C, Operation Manual

Page: 207 / 337

5-1 Section Outline of Host Link/NT Link Operation
196
By reading the currently displayed screen word when the screen switch strobe
flag has turned ON, the number of the currently displayed screen on the
NT620S/620C is displayed.
PC
Currently
displayed
screen
PT status notify area
Currently displayed screen Screen number
Content upgrade memory table
PT status
Screen switch
strobe flag
NT620S/620C
[Currently displayed screen] and [PT status] words in the PT status notify
area
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Bit
– 0 – – – 0 0 –
Word
m
15 14 13 12 11 10 9 8 7 Bit
Screen number (4-digit BCD)*
PT status notify bit PT status
* Screen number: 0001 to 01000
m+2
Screen switch strobe
Screen switch setting
0
Use a 4-digit BCD (binary-coded decimal) value to set a screen number.
The screen switch strobe bit reverts to OFF (0) after this is notified to the PC.
S
Available allocation words
The PT status notify area (PT to PC) can be allocated to the following PC areas.
Symbol C Series PCs Allocated CVM1/CV Series PCs Allocated
DM Data memory
f
Data memory
f
CH Internal/Special Relay
f
Internal/Special Relay
f
TIM Timer Timer
CNT Counter Counter
HR Holding Relay
f
–
AR Auxiliary Relay
f
Auxiliary Relay
LR Link Relay
f
–
f
: OK : NG
Since the special auxiliary relays of the CV series PCs are allocated to the sys-
tem, they cannot be used for purposes other than the system use.
The range of respective area varies with the type of PC. Refer to Appendix L
“PC Memory Map” (page 327).
Procedure 1. Use the support tool to allocate the PT status notify area (PT to PC) to the PC
memory.
2. Create a PC program to read the “currently displayed screen word” in the PT
status notify area when the “screen switch strobe flag” in the PT status notify
area has turned ON.
The contents of the “currently displayed screen word” are updated also by
switching the screen by pressing a touch switch on the NT620S/620C.