284
Memory Tables
Section 7-3
7-3 Memory Tables
The NT31/NT31C has the following three types of memory area that can be written
to freely from the host.
- “Numeral memory tables” for numeric value data Page 284
- “Character string memory tables” for text data Page 291
- “Bit memory tables” for bit data Page 295
The contents of numeral/character string memory tables can be displayed for indi-
vidual memory tables at the Support Tool, and set in table editing.
7-3-1 Numeral Memory Tables
[Function Outline]
“Numeral memory tables” are internal memories of the NT31/NT31C for recording
numeric value data.
Since they can be allocated to words at the host, the contents of host words can be
displayed as numeric values at the NT31/NT31C via numeral memory tables.
Numeral memory tables are assigned numeral memory table numbers so that
they can be managed and designated individually.
1234
9999
Display
Display
Numeral memory table No. 1
Numeral memory table No. 5
Allocated word
PC
NT31/NT31C
[Restrictions]
S The number of numeral memory tables can be set as one of the following in the
“System” settings in the PT configuration settings made at the Support Tool.
- 512 (numeral memory table numbers 0 to 511)
- 1000 (numeral memory table numbers 0 to 999)
- 2000 (numeral memory table numbers 0 to 1999)
Since the numeral memory tables share memory area with the screen data, set-
ting a large number of numeral memory tables reduces the memory area avail-
able for screen data.
S The data quantity of one numeral memory table can be set to either of the follow-
ing by setting at the Support Tool.
1 word (2 bytes)/2 words (4 bytes)
S Since numeral memory table numbers 1000 and higher are not backed up by the
battery, they return to the initial values set with the Support Tool when the power
to the NT31/NT31C is turned ON, when the NT31/NT31C is reset, and on transi-
tion from the System Menu to the RUN mode, regardless of the setting made for
the resume function.
S Numeral memory table numbers 247 to 255 are used with the clock function of
the NT31/NT31C. These tables cannot be used for other applications. For de-
tails on the clock function, refer to 7-15-6 “Clock Function” (page 456).
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