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Memory Tables
Section 7-3
[Display Functions]
Character string memory tables themselves have no display function.
To display the contents of character string memory tables, use 7-9 “Character
String Display” (page 366).
Character strings can also be displayed as messages by using the “alarm list”
(page 406) and “alarm history” (page 406) functions.
[Input Functions]
When a character string memory table is allocated to a word or words at the host,
the contents of the word are read and stored.
However, reading is only executed for those character string memory tables that
are being used for the currently displayed screen (when copying a character string
memory table, the contents of the allocated word(s) of the copy source memory
table are read).
[Output Functions]
When a character string memory table is allocated to a word or words at the host,
the contents of the character string memory table are written to the word(s).
However, writing is only executed in the following cases.
S When the contents of the character string memory table have changed as a re-
sult of operations at the NT31/NT31C, such as memory table copying by touch
switch operation, or use of the input setting function
S When the “Initial” setting of string table is checked when the power to the
NT31/NT31C is turned ON, the NT31/NT31C is reset, or on transition from the
System Menu to the RUN mode (the contents of all character string memory
tables that are allocated to the host and whose “Initial” setting is checked are
written.)
[Processing Functions]
Character string memory tables have no data processing function.
[Relationship with Other Elements]
S When “character string display” is used, the contents of character string memory
tables can be displayed in real time as character strings (page 366).
S When “alarm list” or “alarm history” is used, the contents of the character string
memory table can be displayed as a message (page 406).
S When “character string input” is used, character strings can be input into the
character string memory table from the screen of the NT31/NT31C (page 433).
It is also possible to input character strings from a bar code reader connected to
the NT31/NT31C.
S When the touch switch copy setting function is used, the contents of a character
string memory table can be copied (page 334).
S By operation of the “PT status control area”, data can be copied between
memory tables from the host (page 276).
S If the contents of character string memory tables are changed by operation at
the NT31/NT31C, the change is notified to the “PT status notify area” (page
275).
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