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2-2
Section
Areas for Control/Notification
51
Pt Status Control Bits
The PT status control bits have the functions indicated below.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Bit
0
0
Controlled Item
Screen display
Processing priority registration (for NT link (1:N))
Continuous buzzer
Intermittent buzzer (short)
Display history initialization
Not used
Intermittent buzzer (long)
Backlight mode
Screen printing
PT window opening
Numeral/character string input
PT screen switching
Memory table copy execution
Memory table copy type
Alarm history initialization
Not used
1 (ON)
Performed
Registered
Sounded
Sounded
Performed
Sounded
Lit
Performed
Disabled
Disabled
Disabled
Performed
Numeral
Performed
0 (OFF)
Not performed
Canceled
Stopped
Stopped
Not performed
Stopped
Flashing
Not performed
Enabled
Enabled
Enabled
Not performed
Character string
Not performed
Always 0
Always 0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
n+3ch
Note
The backlight mode bit (bit 8) is valid in the NT631.
Reference:
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
NT30/620 compatible mode. Refer to
Appendix C for details on the NT30/620
compatible mode.
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).
Reference:
Even when bit 15 is OFF, the designated screen will be displayed if screen
switching is designated from the host, or the status of bit 8 (backlight mode)
changes, or the touch panel of the PT is pressed.
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