X8 Instruction Set Reference Manual
4-4
Programming Instruction Overview
Direct Addressing
When you use direct addressing, you can input a specific data table elements of
inte
r
nal X8 Series PLC (below is an example of N4.1) as shown in the example
below.
Indirect Addressing
Indirect addressing allows components within the address to be used as
pointers to other data locations within the controller.
This functionality can be especially useful for certain types of applications,
recipemanagement, batch processing and many others.
To define which components of an address are to be indirected, a closed
bracket "[ ]" is used.
The above example is the ladder program that adds 1221 to data table value
that is expressed N4.[N4.1] and stores it to N4.2.
If the value of location N4.1 = 10, this instruction copies data value from data
table specified by N4.10 and stores it to location N4.2 after adding 1221 to the
data value.
In this example, the range of N4.1 which is supported by X8 Series PLC is
from 0 to 1534, and total is 1535.
0002
B3.0.0
ADD
EN
ENO
IN 1
N4.1 -
0 <
OUT - N4:2
> 1221
IN 2
1221 -
1221
<
0002
B3.0.0
ADD
EN
ENO
IN 1
N4.[N4.1] -
0 <
OUT - N4:2
> 1221
IN 2
1221 -
1221
<
Summary of Contents for X8 Series
Page 1: ...Catalog Number s X8 M14DDT X8 M16DDR X8 M32DDT X8 Instruction Manual Reference Manual ...
Page 16: ......
Page 64: ...X8 Instruction Set Reference Manual 2 12 X8 Series PLC Memory and Data Table ...
Page 166: ...X8 Instruction Set Reference Manual 7 8 Relay Type Bit Instructions ...
Page 180: ...X8 Instruction Set Reference Manual 8 14 Timer and Counter Instructions ...
Page 205: ...X8 Instruction Set Reference Manual Math Instructions 10 17 ...
Page 206: ...X8 Instruction Set Reference Manual 10 18 Math Instructions ...
Page 212: ...X8 Instruction Set Reference Manual 11 6 Converion Instructions ...
Page 218: ...X8 Instruction Set Reference Manual 12 6 Logical Instructions ...
Page 236: ...X8 Instruction Set Reference Manual 15 8 Shift and FIFO LIFO Instructions ...
Page 242: ...X8 Instruction Set Reference Manual 16 6 Sequencing Instructions ...
Page 252: ...X8 Instruction Set Reference Manual 18 4 Input and Output Instructions ...
Page 280: ...X8 Instruction Set Reference Manual 20 12 PID Control ...
Page 296: ...X8 Instruction Set Reference Manual 21 16 ASCII Instructions ...
Page 308: ...X8 Instruction Set Reference Manual 22 12 Communications Instructions ...
Page 312: ...Appendix A 4 System Error Code ...
Page 313: ...Appendix B MSG Instruction Error Code MSG Instruction Error Code ...
Page 322: ...Appendix B 10 MSG Instruction Error Code ...
Page 325: ...ASCII Character Set Appendix C 3 ...
Page 326: ...Publication number X8 RM001A EN September 2012 ...
Page 327: ...Copyright 2012 RS Automation Co Ltd All rights reserved ...