7-2
Section
Numeral Memory Table
278
*1:
F in the most significant digit position (8th digit) indicates a negative value.
*2:
With the NT21, NT31, NT31C, NT631, and NT631C, a hexadecimal num-
ber can be input by entering $ at the beginning of a numeric value. The input
hexadecimal value is converted to decimal for display.
For PT models other than the NT21, NT31, NT31C, NT631, and NT631C, the
input 8-digit hexadecimal value is simply stored as it is; there are no distinctions
between BCD and hexadecimal for these models. If the input numeric value is
displayed in BCD format, F in the most significant digit position (8th digit) is
treated as a negative sign.
With the NT21, NT31, NT31C, NT631, and NT631C, the input numeric value is
stored after conversion to signed binary data (2 words).
Setting of an initial value is valid when the resume function is not selected and the
[Initial] item is selected for the numeral memory table entry, and in this case the
content of the numeral memory table entry is returned to the initial value. If the PT
has the memory table initialization function, this function can also be used to re-
turn the content of a numeral memory table entry to the initial value.
Initial
Specify whether or not the content of the numeral memory table entry is written to
the allocated word in the host when the PT is switched on or reset, or the mode is
changed from the System Menu to RUN.
The term “initialize” means the processing to initialize the content of a word in the
host with the content in a numeral memory table entry. The setting for [Initial] is
not valid if the numeral memory table entry is not allocated to a word in the host.
To make the [Initial] item valid, click on the check box to display a cross mark (
)
in the box. If the box is clicked on while it is in the valid state, the [Initial] item is
made invalid.
Reference: The content of numeral memory table entries at the start of PT operation is as
shown below according to whether or not a numeral memory table entry is allo-
cated to the host, the [Initial] setting for the numeral memory table entry, and
whether or not the resume function is used.
Allocation to
[Initial]
Resume Function
Allocation to
Host
[Initial]
setting
Used
Not Used
Allocated
Initialized
(valid)
Existing numeral memory
table value retained
(also for the word in the
host)
Initial value of the numer-
al memory table
(also for the word in the
host)
Initial value of the numeral memory table entry if it is
initialized by System Menu operation
(also for the word in the host)
Not initialized
(invalid)
Content of word in the host
Not allocated
(Invalid)
Existing numeral memory
table value retained
Initial value of the numer-
al memory table entry
In case numeral table entry has been initialized in
the system menu operation, initial value of the nu-
meral memory table entry
Storage Type (only for the NT21, NT31, NT31C, NT631, and NT631C)
Specify if a numeral in the PC (PLC) is treated as BCD or binary data when read-
ing/writing the content of a PC (PLC) word to which a numeral memory table
