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NT20 Status Control
Section 5-4
5-4
NT20 Status Control
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.
5-4-1
Controllable NT20 Functions
PT Status Control Bits of the PT Status Control Area
PT status control designation
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.
Buzzer sounds
Screen off
PT status control area
Screen switch setting
Control data
NT20
PLC
PT status control bits
Copy memory table
entry setting
Item Controlled
1 (ON)
0 (OFF)
Screen display
(Note 1)
ON
OFF
Processing priority
registration
(Note 2)
ON
OFF
Continuous buzzer
ON
OFF
Intermittent buzzer
ON
OFF
Backlight mode
ON
Flash
Note 1: The backlighting is on when the
screen display bit is set to ON
and off when the screen display
bit is set to OFF.
Note 2: Priority registration is only valid
when NT link (1:N) is set.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Bit
0 0 0
Word
n+3
15 14 13 12 11 10 9 8 Bit
PT status control bits
0 0
Summary of Contents for NT20
Page 1: ...Programmable Terminal Cat No V091 E1 01 NT20 USER S MANUAL ...
Page 2: ...NT series Programmable Terminal User s Manual Produced March 2007 ...
Page 3: ...iv ...
Page 5: ...vi ...
Page 9: ...x TABLE OF CONTENTS ...
Page 15: ...xvi ...
Page 21: ...xxii EC Directives 6 ...
Page 37: ...16 Before Operating Section 1 6 ...
Page 153: ...132 Transferring the Resource Data Section 3 11 ...
Page 185: ...164 Numeral Setting Section 4 8 ...
Page 267: ...246 Key to Programs Section 6 8 ...
Page 281: ...260 Specifications Appendix A ...
Page 285: ...264 Transporting and Storing PTs Appendix C ...
Page 303: ...282 Function Restrictions Depending on the Support Tool Appendix I ...
Page 307: ...286 Index ...
Page 309: ...288 Revision History ...