Variables; Types Of Variables - Toshiba V Series User Manual

Chapter 3 Software Functions
3.2

Variables

3.2.1

Types of variables

Variables are stored in the memory (or memory region) referenced freely from programs.
Variable are classified into several types depending on their usage. The detailed
specifications of variables are described here.
(1) Classification of variables by the effective area
3
Controller
Controller
global
variable
Program
Local
variable
38
The variables are classified into 4 types depending on the effective area from which
variables are referenced.
• Local variables
Variables effective only within each program and can be used as work memory in each
program.
• Controller global variables
Variables that can be used in common in a controller and can be used to exchange data
between different programs.
• Station global variables
Variables that can be used in common between controllers and can be used to
exchange data with the programs of other controllers (no variables of this type in the
LC51*).
• LAN global variables.
Variables that can be used in common between stations and can be used to exchange
data with the programs of other stations (READ only).
Station
LAN global variable
Station global variable
Controller
Controller
global
variable
Program
Local
variable
Program Program
Local Local
variable variable
Figure 3-3 Effective Areas of Variables
Station
LAN global variable
Station global variable
Controller
Controller
global
variable
Program
Local
variable
Program
Local
variable
Model 1000 Loop Controller L1 LC511, 512 User's Manual
Controller
Controller
global
variable
Program
Local
variable
Program
Local
variable