Nt20 Status Control; Controllable Nt20 Functions - Omron NT20S-ST121B-EV3 User Manual

NT20 Status Control

5-4

NT20 Status Control

5-4-1

Controllable NT20 Functions

The status of the NT20 can be controlled from the PLC by writing control data
to the "PT status control bits" of the PT status control area allocated in the
PLC memory.
Screen off
Buzzer sounds
PT Status Control Bits of the PT Status Control Area
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Bit
Word
PT status control bits
n+3
15 14 13 12 11 10 9 8 Bit
The PLC status control bits remain unchanged if the NT20 status is changed
with the screen attributes or memory switches, which means that the status of
the PT status control bits does not match the actual status of the NT20. For
example, the buzzer may sound even though the setting for continuous buzzer
bit 13 is "OFF".
In this kind of case, control the NT20 by using the PT status control bits.
• Screen Display (Bit 15)
The screen display bit is used to display and clear the screen to prevent
"burn-in" on the CRT. Set bit 15 to 0 (OFF) to clear the screen. The back-
light will also go OFF at the same time.
When the screen has been cleared, the last displayed screen can be re-
displayed either by turning Bit 15 ON, or by pressing a touch switch. The
backlight will also light at the same time.
NT20 PLC
PT status control area
Screen switch setting
Copy memory table
entry setting
PT status control designation
0 0
0 0 0
Item Controlled
Screen display
(Note 1)
Processing priority
registration
(Note 2)
Continuous buzzer
Intermittent buzzer
Backlight mode
Note 1: The backlighting is on when the
Note 2: Priority registration is only valid
Section 5-4
Control data
PT status control bits
1 (ON) 0 (OFF)
ON OFF
ON OFF
ON OFF
ON OFF
ON Flash
screen display bit is set to ON
and off when the screen display
bit is set to OFF.
when NT link (1:N) is set.
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