Omron NT21 Reference Manual page 96

Memory Tables
Reference:
Common Attributes
80
2000 (character string memory table entry numbers 0 to 1999)
Since the character string memory table shares memory with the screen
data, setting a large number of character string memory table entries re-
duces the memory area available for screen data.
The data quantity of one character string memory table entry can be set as fol-
lows by setting at the Support Tool (a setting of 0 indicates no allocation):
0 to 40 characters (= 0 to 40 bytes, which is 0 to 20 words)
Character string memory table entry numbers 500 and higher always remain
at the initial value set with the Support Tool. These values cannot be changed
later and can only be read. Words cannot be allocated for these table entries in
the host either.
The characters that can be stored in character string memory table entries are
alphanumerics, symbols, and marks (codes FF20 to FFFF
S If 00
(NULL code) is encountered in a character string, the subsequent data
H
is ignored.
S If codes outside the ranges indicated above are written to the allocated words
at the host, the character strings may not be displayed correctly.
S When the PT is set to NT20S and NT30/NT620 compatible mode, image and
library codes can be included in the character strings. Refer to Appendix C for
details on the NT20S and NT30/620 compatible modes.
Character string memory table entries have the following properties.
Property Property
Value Alphanumerics and symbols, Marks
Character string in the initial status after the contents of the character
string memory table have been initialized.
Initial Check mark (initialize)/No check mark (do not initialize)
This setting determines whether or not the allocated words at the host
are initialized when the power to the PT is turned ON, when the PT is
reset, and on transition from the System Menu to the RUN mode.
Initialization here means initialization of the allocated words at the host:
when a check mark is set, the previous character string memory table
contents is written to the host words. When no check mark is set, the
data at the host is read and set in the character string memory table
entries.
PC
Any word address at the host
Address Address
Host word(s) allocated for the character string memory table entry.
Designate the first (lower) word.
For details, refer to Allocated words (page 80).
Words
1 to 20
The number of words allocated in the host for the character string
memory table entry.
For details, refer to Allocated words (page 80).
I/O
Up to 16 characters of text
Comment Comment
Comment that describes the contents of a character string memory table
entry
Allocated Words
One to twenty words can be allocated at the host to each character string table
entry. Words can be allocated in the following host (PC) areas.
Possible Settings
Meaning
Section 2-3
).
H