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Data Types Used in ST Programs Section 5-2
5-2 Data Types Used in ST Programs
The following tables show the data types used in ST programs. For details on
the data types that can be used in ST programs within function blocks, refer to
Part 1: Function Blocks in this manual.
5-2-1 Basic Data Types
Note (1) In ST programs, these data types are recognized as the following data
types.
• UNIT BCD is recognized as WORD.
• UDINT BCD is recognized as DWORD.
• ULINT BCD is recognized as LWORD.
• CHANNEL is recognized as WORD.
(2) This data type cannot be used in an ST program. A program error will oc-
cur if this data type is specified.
5-2-2 Derivative Data Types
Data type Content Size Range of values
BOOL Bit data 1 0 (FALSE), 1 (TRUE)
INT Integer 16 −32,768 to +32,767
DINT Double integer 32 −2,147,483,648 to +2,147,483,647
LINT Long (8-byte) integer 64 −9,223,372,036,854,775,808 to +9,223,372,036,854,775,807
UINT Unsigned integer 16 &0 to 65,535
UINT BCD Unsigned BCD integer --- (See note 1.)
UDINT Unsigned double integer 32 &0 to 4,294,967,295
UDINT BCD Unsigned double BCD
integer
--- (See note 1.)
ULINT Unsigned long (8-byte)
integer
64 &0 to 18,446,744,073,709,551,615
ULINT BCD Unsigned long (8-byte)
BCD integer
--- (See note 1.)
REAL Real number 32 −3.402823 × 10
38
to −1.175494 × 10
−38
, 0,
+1.175494 × 10
−38
to +3.402823 × 10
38
LREAL Long real number 64 −1.79769313486232 × 10
308
to −2.22507385850720 × 10
−308
, 0,
2.22507385850720 × 10
−308
to 1.79769313486232 × 10
308
WORD 16-bit data 16 #0000 to FFFF or &0 to 65,535
DWORD 32-bit data 32 #00000000 to FFFFFFFF or &0 to 4,294,967,295
LWORD 64-bit data 64 #0000000000000000 to FFFFFFFFFFFFFFFF or
&0 to 18,446,744,073,709,551,615
STRING Text string Variable ---
FUNCTION
BLOCK
Function block instance --- ---
CHANNEL Word --- (See note 1.)
NUMBER Constant or number --- (See note 2.)
Array 1-dimensional array; 32,000 elements max.
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