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5-1
Section
Outline of Host Link/NT Link Operation
193
For the continuous and overlapping screens, refer to the “Classification of
screens” (page 129).
Example of Display Screen Switching
This example operates the PC switch (bit) to switch the NT620S/620C display
screen.
S
Support tool settings
Make the following settings with the support tool:
PT status control area:
CH 0100
PT status notify area:
CH 0110
Screen number to be created:
Screen No. 2 and No. 3
S
PC ladder program
Create a PC ladder program as follows:
@MOV(21)
#0002
100
00002
00003
11212
@MOV(21)
#0003
100
@MOV(21)
110
100
(1)
Screen number
Screen switch setting word
(2)
Screen number
Screen switch setting word
(3)
Screen number
Screen switch setting word
Screen switch strobe flag
S
Program operation
(1) Screen No. 2 is displayed on the NT620S/620C when bit 00002 turns ON.
(2) Screen No. 3 is displayed on the NT620S/620C when bit 00003 turns ON.
(3) When the screen switch strobe flag turns ON, the number of the currently
displayed screen is read and written to the currently displayed screen word
in the PT status notify area. In this case, the NT620S/620C will not write the
same screen twice.
5-1-5 Switching the Screen Display
(by Using the Allocated Bit of a Bit Memory Table)
This section describes the actual procedure used to perform screen switching
under the control of the PC by using bit memory tables.
This function continually reads the allocated bits of the screen switching function
regardless of which screen is currently displayed. Consequently, if the number of
screens that could be switched to with this function is large, PT operations (such
as updating of memory tables, touch switch response, lamp response) may be
delayed.
One of two methods can be used to switch the screen display: registering a
screen number for a touch switch and pressing the touch switch during opera-
tion, or writing the screen number into the PT status control area. For details on
these methods, see “Stand Alone Functions” (page 154) or “Switching the
Screen Display (by Using the PT Status Control Area)” (page 191).
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...
Page 3: ...iv...
Page 5: ...vi...
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