Omron NT21 Reference Manual page 73

Areas for Control/Notification
15 14 13 12 11 10
n+3ch 0
Reference:
Reference: Even when bit 15 is OFF, the designated screen will be displayed if screen
Pt Status Control Bits
The PT status control bits have the functions indicated below.
9 8 7 6 5 4 3 2
The backlight mode bit (bit 8) is not supported by the NT631.
The screen printing bit (bit 7) is not supported by the NT21.
S Since the statuses of the PT status control bits do not change even if the status
of the PT changes in accordance with the settings of attributes or memory
switches, the statuses of the PT status control bits may sometimes disagree
with the status of the PT. For example, the buzzer may be sounding even
though the continuous buzzer bit is OFF. In such a case, perform PT status
control bit operations to achieve agreement with the status of the PT.
S The PT status control bits are checked in bit units by the PT. The only functions
that are actually performed are those for which the corresponding bits have
changed in status.
S The configuration of the PT status control bits is different when the PT is set to
NT20S or NT30/620 compatible mode. Refer to Appendix C for details on the
NT20S and NT30/620 compatible modes.
Screen Display (Bit 15)
The screen display bit displays and clears screens. It is used to prevent the
formation of an afterimage on the display panel, etc. When bit 15 is turned OFF,
the screen is cleared and the backlight also goes off. However, if the screen sav-
er function is set with the memory switches of the PT, the screen saver is acti-
vated (the operation depends on the setting made for the screen saver function).
If bit 15 is turned ON (1), or the touch panel is pressed, while the screen is
cleared (or while the screen saver function is working), the screen that was dis-
played immediately before the screen was cleared is redisplayed. The backlight
also comes back on (or flashes).
switching is designated from the host, or the status of bit 8 (backlight mode)
changes, or the touch panel of the PT is pressed.
1 0 Bit
0
Controlled Item
15
Screen display
14
Processing priority registration (for NT link (1:N))
13
Continuous buzzer
12
Intermittent buzzer (short)
11
Display history initialization
10
Not used
9
Intermittent buzzer (long)
8
Backlight mode
7
Screen printing
6
PT window opening
5
Numeral/character string input
4
PT screen switching
3
Memory table copy execution
Memory table copy type
2
Alarm history initialization
1
Not used
0
Section 2-2
1 (ON) 0 (OFF)
Performed Not performed
Canceled
Registered
Stopped
Sounded
Stopped
Sounded
Not performed
Performed
Always 0
Stopped
Sounded
Flashing
Lit
Not performed
Performed
Disabled Enabled
Disabled Enabled
Disabled Enabled
Performed Not performed
Numeral Character string
Performed Not performed
Always 0
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