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Areas for Control/Notification
Section 7-2
[Screen switch setting in the PT status control area]
1514131211109876543210
Word
Bit
n
Screen switch setting
Screen number (4-digit BCD or hexadecimal)
The screen numbers that can be set are as follows.
BCD Hexadecimal Screen
0000H 0000H No-display (screen cleared)
0001 to 3999H 0001 to 0F9FH (3999) Screen numbers 1 to 3999
9001H 2329H (9001) Occurrence history screen
9002H 232AH (9002) Frequency history screen
Reference - The screen can also be switched by bit memory table operation (page 480), by
touch switch operation (page 481), or by using the alarm list/history function
(page 485).
- To display overlapping screens, designate the screen number of the parent
screen.
- If there are no elements registered for the designated screen number, or if a key-
board screen is designated, the screen does not switch.
- When the NT31/NT31C starts operating, the screen is displayed according to
the contents of the “screen switch setting” word. If the contents of the “screen
switch setting” word are invalid, the screen is displayed according to the “Initial
Screen” in the PT configuration settings made at the Support Tool. If the setting
for “Initial Screen” is also invalid, an error message is displayed.
- When data is written from the NT31/NT31C
When the screen display has been switched by operation at the NT31/NT31C,
the new screen number is written as a 4-digit BCD or hexadecimal value into
the “screen switch setting” word by the NT31/NT31C. At the same time, the
“ON” status is also notified to the screen switch strobe flag of the “PT status”
word of the PT status notify area by the NT31/NT31C (after notification, the
OFF status is re-established) (page 487). Whether the data is written in BCD
or hexadecimal format is determined by the setting for “numeral storage type”
in the PT configuration settings made at the Support Tool.
Currently displayed
screen
PCNT31/NT31C
← Screen number
PT status control area
Screen switch setting
Copy memory
table setting
PT status control setting
Reserved for system use
← Screen switch strobe flag
PT status notify area
Content update memory table
PT status
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