BOOL (Bit)
A Boolean variable, one whose value is either true or false.
Example:- 0 or 1
SINT (Short Integer)
Short Integer uses only
8 bits of memory and therefore is a value of 0 to 255 or if signed from
-128 to +127.
Example:- 56
INT (Integer)
Integer uses only 16 bits of memory and therefore is a value of 0 to 65535 or if signed from
-32768 to +32767.
Example:- 26733
DINT (Double integer)
Double Integer uses only 32 bits of memory and therefore is a value of 0 to 4294967295 or if signed from
-2147483647 to +2147483647.
Example:- 1436353644
REAL (Floating-point number)
Real uses only 32 bits of memory. Value from -3.40282306e+38 to 3.40282306e+38.
Example:- -637.74646
STRING
String uses only 8 bits of memory for single character. If you use 4 character total uses only 32 bits of memory
Example:- "Test Word"
T - 8 bits
e - 8 bits
s - 8 bits
t - 8 bitsSpace - 8 bits
W - 8 bits
o - 8 bits
r - 8 bits
d - 8 bitsTotal - 72 bits
Example from Rslogix 5000
