AB PLC Data Types

 

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 bits
Space   - 8 bits

W         - 8 bits

o           - 8 bits

r            - 8 bits

d           - 8 bits

Total     - 72 bits

Example from Rslogix 5000