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5-1
Section
Outline of Host Link/NT Link Operation
195
Example Application of Screen Switching
In this example, if the temperature in a water tank rises above the upper limit, a bit
is turned ON, and the warning screen that corresponds to the bit is displayed.
S
Support tool settings
The following settings are made using the support tool.
Bit memory table No. 0
Allocated bit
CH 000100 (input bit that comes ON when the
. . . . . . . . .
temperature of the water tank rises above the
upper
limit)
Function
Screen switching (screen No. 1000)
. . . . . . . . . . . . .
Created screen No.
Screen No. 1000
. . . .
Proc.4 Water Tank Temp.
OVERHEATING
Return
Urgent: Check the thermostat!
S
PC program
A ladder program to control the NT620S/620C is not required.
S
Program operation
When bit 001000 comes ON, the NT620S/620C displays screen No. 1000.
5-1-6 Notifying the Display Screen to the PC
(To Know the Number of Currently Displayed Screen)
The following describes the processing to know the number of currently dis-
played screen of the NT620S/620C.
This processing reads the data from the PC status notify area.
To indicate that the screen has switched, use the screen switch strobe flag.
To display the number of the currently displayed screen, use the currently dis-
played screen word.
When the screen has switched, the NT620S/620C notifies the following to PT
status notify area (PT to PC) allocated to the PC.
Screen switch notification: Screen switch strobe flag of the PT status word
New screen number:
Currently displayed screen word
Summary of Contents for NT620C
Page 1: ...Cat No V033 E1 5 Programmable Terminals NT620S 620C OPERATION MANUAL...
Page 2: ...NT620S 620C Programmable Terminals Operation Manual Revised April 2001...
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Page 5: ...vi...
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