![background image](http://html1.mh-extra.com/html/omron/nt620c/nt620c_operation-manual_744559211.webp)
5-2
Section
Memory Tables and Graphs
200
There are two methods for referencing numeral memory tables used for numeral
display, as follows:
- Direct specification
- Indirect specification
Only direct specification can be used as the reference method for graphs and
numeral settings.
S
Direct specification
Direct specification is a method of specification in which the contents of dis-
played memory tables are directly correlated with the contents of the allocated
words.
Direct
specification
Character-string
memory table 18
Allocated word
(character-string memory table 18)
NT620S/620C
PC
0 0 6 2
0 0 6 2
0 0 6 2
DM0100
S
Indirect specification
Indirect specification is a method whereby the contents (numeric value) of the
specified numeral memory table are taken as the number of a numeral memory
table, and the contents of the numeral memory table with that number are dis-
played.
A combined total 50 of numeral displays and character-string displays can be
specified on one screen by using indirect specification.
Indirect
specification
Numeral memory
table 18
Allocated word
(numeral memory table 18)
NT620S/620C
PC
7 7 7 7
0 0 6 2
0 0 6 2
DM0100
Character-string
memory table 62
Allocated word
(character-string memory table 62)
7 7 7 7
7 7 7 7
DM0100
This specification method is a little complex, but it allows the display to be
changed more easily according to the circumstances. In the example above, if
1 were added to the contents of memory table 18 to give 52, the contents of
memory table 63 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 62 in the exam-
ple above).
However, in comparison with direct specification, indirect specification re-
quires more time for processing.
Summary of Contents for NT620C
Page 1: ...Cat No V033 E1 5 Programmable Terminals NT620S 620C OPERATION MANUAL...
Page 2: ...NT620S 620C Programmable Terminals Operation Manual Revised April 2001...
Page 3: ...iv...
Page 5: ...vi...
Page 328: ......
Page 329: ......