Omron NT620C, Operation Manual

Page: 210 / 337

5-2 Section Memory Tables and Graphs
199
were added to the contents of memory table 20 to give 52, the contents of
memory table 52 would be displayed instead.
The memory tables used for display can also be allocated to areas in the PC, so
that the display can also be changed in response to changes in the data to be
displayed (i.e., the contents of character-string memory table 51 in the example
above).
However, in comparison with direct specification, indirect specification requires
more time for processing.
Setting the Words of the Character-String Memory Table
When creating the screen data by using the support tool, make the following set-
tings for each numbered character-string:
S
Initialization setting
Set whether or not the PC words are initialized with the character-string
memory table initial value registered to the screen data memory when the main
power supply is turned ON or reset.
S
Number of registration words
Set the number of words within 20 words required for registering the character-
string data. One word can store two characters.
S
Setting the words for the character-string memory tables
The character-string memory tables can be allocated to the following PC
words. Set the word type and the first word.
Symbol C Series PCs Allocated CVM1/CV Series PCs Allocated
DM Data memory
f
Data memory
f
CH Internal/Special Relay
f
Internal/Special Relay
f
TIM Timer Timer
CNT Counter Counter
HR Holding Relay
f
–
AR Auxiliary Relay
f
Auxiliary Relay
LR Link Relay
f
–
f
: OK : NG
Since the special auxiliary relays of the CVM1/CV series PCs are allocated to
the system, they cannot be used for purposes other than the system use.
The range of respective area varies with the type of PC. Refer to Appendix L
“PC Memory Map” (page 327).
If the “number of registration words x 2” (“word setting window”) set with the
support tool is larger than the “number of character digits” (“character-string
display setting” window), the character-string may be broken halfway.
Displaying and Referencing Numeral Memory Table Contents
Since numeral memory tables can be allocated to words in the PC, the PC can
write data to the numeral memory tables, and initial values can be set when
creating the screen data.
In addition, if a numeral memory table is correlated with a graph, the graph can be
displayed in accordance with the numeric value in the numeral memory table.
During operation, automatic updating is performed to ensure that the currently
displayed NT620S/620C numeral memory table contents and PC word contents
always match each other.