Instruction Manual

Language Reference • Reference 211

Publication 1398-PM601A-EN-P — October 2000

WORDS

Variable, Nonvolatile, User Variable

Purpose Load a user-defined variable with a value from another variable, result of a math

expression, a constant, a timer, or an analog input.

Syntax Gn = value

variable = Gn

n The number of the variable. n = 1, 2, 3, ..., 64.

value Value can be a constant, a nonvolatile variable Gn, a volatile

variable Vn, or a system variable.

variable The variable may be a nonvolatile variable Gn, a volatile vari-

able Vn, or a system variable

Remarks G and V variables are stored internally as 4 bytes for the mantissa (the part before the

decimal point), 2 bytes for a numerator (the top part of a fraction), and 2 bytes for a

denominator (the bottom part of a fraction). The range of numbers that can be repre-

sented in 4 bytes is ±2,147,483,648. The range of numbers that can be represented in 2

bytes is ±32,767. Therefore, the range of numbers that can be contained in a G or V

variable and any intermediate value is:

The changes made to Gn remain in effect even after power is removed. Changes made

to a Gn by one program will be seen by other programs. Vn variables are volatile and

will lose their values when power is removed

TIP: Variables can be assigned names using the ASSIGN command and then refer-

enced by those names to make the program easier to read.

See Also Vn, Fn, Bn, Part 4 • Programming, Arithmetic

Example

G7 = ADC1

G14 = PCMD

G7 = V7 + 1

G8 = TIMER1

G9 = POS1

G or V = ±+

2 147 483 648

32 767

,,,