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Memory Tables
Section 7-3
Since the special auxiliary relays of the CVM1/CV series PCs are all allocated to
system functions, they cannot be used for purposes other than system use.
The range of each memory area differs according to the PC type. Refer to AP-
PENDIX L “PC Memory Map”, page 684.
The relationships among the allocated words, the number of allocated words,
and the contents of character string memory tables are indicated in the figure
below.
Example: Number of allocated words = 4 words
4142
4344
FF01
4546
“ABCDYEF”
“A” = 41H, “B” = 42H First word
“C” = 43H, “D” = 44H First word + 1
“Y” = FF01H First word + 2
“E” = 45H, “F” = 46H First word + 3
S “Initial” setting and initial value
The “Initial” setting determines whether the contents of character string memory
tables are written to the allocated word(s) at the host when the power to the
NT31/NT31C is turned ON, when the NT31/NT31C is reset, or on transition from
the System Menu to the RUN mode.
Here, “Initial” (initialization) means the initialization of the contents of host
word(s) as they are overwritten by the contents of the character string 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 NT31/NT31C starts operation, the contents of character string memory
tables are as follows depending on whether or not the character string memory
table is allocated to the host, on the “Initial” setting for the character string memory
table, and on whether or not the resume function is used.
Allocated
Resume Function
Allocated
to Host?
“Initial” Setting
Used Not Used
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
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