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2-3
Section
Memory Tables
74
Initialize
The initialize setting determines whether the contents of character string
memory tables are written to the allocated word(s) in the host when the power to
the PT is turned ON, when the PT is reset, or the PT is switched to RUN mode
from the System Menu.
Here, initialize means the initialization of the contents of host word(s) as they are
overwritten by the contents of the numeral memory table. If the character string
memory table is not allocated to a host word or words, this setting has no effect.
Reference:
When the PT starts operation, the contents of character string memory tables are
as follows depending on whether or not the character string memory table is allo-
cated to the host, on the Initial setting for the character string memory table, and
on whether or not the resume function is used.
Allocated
Initial Set-
Resume Function
Allocated
to Host?
Initial Set-
ting
Used
Not Used
Checked
Existing character string
memory table value re-
tained (at host word(s)
also)
Initial value of character
string memory table used
(at host word(s) also)
Yes
Checked
When the character string memory table is initialized by
System Menu operation: initial value of the character
string memory table (at host word(s) also)
Not checked
Contents of host word(s)
Existing character string
memory table value
Initial value of character
string memory table
No
(Ineffective)
When the character string memory table is initialized by
System Menu operation: initial value of the character
string memory table
Character string memory tables themselves have no display function.
To display the contents of character string memory tables, use
2-9 Character
String Display (page 138).
Character strings can also be displayed as messages by using the alarm list
(page 173) and alarm history (page 173) functions.
Specify character string memory tables when displaying character string dis-
plays as guide characters of lamps or touch switches as well.
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).
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.
•
When the contents of the character string memory table have changed as a
result of operations at the PT, such as memory table copying by touch switch
operation, or use of the character string input function
•
When the Initial setting of string table is checked when the power to the PT is
turned ON, the PT 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.)
Display Functions
Input Functions
Output Functions
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Summary of Contents for NT21 Series
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