489
Screen Display and Notification
Section 8-3
Reference: While the NT31/NT31C is running, the screen number of the currently displayed
screen is always recorded in the “screen switch setting” word in the PT status con-
trol area (except when the screen displayed is an error screen or the System Menu
screen, in which case the screen number of the screen displayed immediately be-
fore remains recorded).
[Example of Use]
An example of a PC program which reads the screen number each time the screen
is switched by the NT31/NT31C is described below. This example program stores
the previous screen number also.
S Setting with the Support Tool
Set the following words with the Support Tool.
- Allocated word in the PT status control area:
00100 (word 100 in the CIO area)
- Allocated word in the PT status notify area:
00110 (word 110 in the CIO area)
S PC program
Create the PC ladder program as indicated below.
@MOV(21)
DM0100
DM0101
11112
(1)
(2)
Screen
switching
strobe
Word for storing the screen number of the previous screen
Word for notifying the screen number of the presently displayed screen
Word for storing the screen number of the new screen
@MOV(21)
100
DM0100
S Program operation
(1) When the screen switching strobe (bit 11112) comes ON as the screen is
switched by operation at the NT31/NT31C, the program transmits the data
at DM0100 to DM0101. The previous screen number is saved to the word
provided for that purpose.
(2) The program reads out the new screen number that was notified to the
NT31/NT31C to transmit it to DM0100. The screen number of the screen
presently displayed at the NT31/NT31C is stored to DM0100.
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