Omron NT20S-ST121B-EV3 User Manual page 194

Overview of Direct Connection Operations
E EM Area
(See note 2.)
E0_to EC_ ---
Note
1,2,3...
Example of Display Screen Switching
❍
EM Area
Current bank
--- ---
Since the AR area bits of the CVM1/CV series PLCs 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 PLC.
(1) LR 00000 to LR 00199 are converted to CIO 01000 to CIO 01199.
(2) The EM Area is supported only by the C200HX/HG/HE-(Z)E.
1. Use the Support Tool to allocate the PT status control area (PLC to PT) to
the PLC memory.
2. Create a PLC program to write the number of the displayed screen to the
"screen switch setting word" in the PT status control area.
Use a 4-digit BCD (binary-coded decimal) value to set a screen number.
If a screen has been switched by operating the PT status control area (PLC to
PT), the contents of the "currently displayed screen word" in the PT status
notify area (PT to PLC) also change.
• Screen Switching Timing
The NT20 screen switches when the contents of the "screen switch setting"
have changed. To re-specify the number of the currently specified screen,
first write the value 0000 to clear the screen before writing the appropriate
screen number.
• Use of the Screen Switching Strobe
Create a program to read the number of the currently displayed screen and
to write the number to the "screen switch setting word" at the leading edge
of the "screen switching strobe" of the PT status notify area. This program
enables screen switching by using the touch switches on the NT20 and
eliminates repeated setting of the same screen number. If the screen
switching is not executed on the NT20, the screen switching strobe does
not need to be checked.
For the screen switching strobe, refer to the "Notifying the PLC of the Dis-
play Screen," below.
• Continuous Screens and Overlapping Screens
Continuous or overlapping screens can be displayed by designating the
parent screen. If a child screen is designated, only the child screen is dis-
played.
For the continuous and overlapping screens, refer to 4-3-1 Classification of
Screens on page 140.
This example operates the PLC switch (bit) to switch the NT20 display screen.
• Support Tool Settings
Make the following settings with the Support Tool:
PT status control area: Word 0100
PT status notify area: Word 0110
Screen number to be created: Screen #2 and #3
• PLC Ladder Program
Not for EM Area
Host Link Current bank
--- EM Area
EM bank 0 to C
Section 5-1
Not for
Host Link
Not for
Host Link
❍: OK × : NG
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