Creating ST Program

Comparison of Internal/Local/Global Variables and PLC device

Itmes

Internal Var

Local Var

Global Var

Device

Number of variables that can be registered in a single ST program

500

500

-

-

Number of variables that can be registered in a project

500x128*

500x128*

10,000

CPU spec

Adding arrays/structures (declaration and usage)

X

O

O

X

PLC device allocation (ex. D15)

X

X

O

-

Retain setting (maintaining value after power reset = latch)

X

X

O

O

Online Edit Modification (Add/Edit)

O

O

X

O

Online Edit – Maintaining data

X

X

O

O

Usage in scan programs

X

X

O

O

Monitoring in device monitor

X

X

O

O

Monitoring in memory monitor

X

X

X

O

Usage in special programs (communication, special)

X

X

X

O

Data backup/recovery function

X

X

X

O

Use of names in Korean and other non-English languages

X

X

X

-