41
Data Types Supported in Function Blocks
Section 2-2
• Structured text (ST language): Enter decimal numerical values as is
and enter hexadecimal numerical values after 16#.
Comment A comment of up to 30,000 characters long can be entered.
2-2 Data Types Supported in Function Blocks
2-2-1 Basic Data Types
Note The TIMER and COUNTER data types cannot be used in structured text func-
tion blocks.
2-2-2 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
UDINT Unsigned double integer 32 &0 to 4,294,967,295
ULINT Unsigned long (8-byte)
integer
64 &0 to 18,446,744,073,709,551,615
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 (See note.) Variable 1 to 255 ASCII characters
TIMER Timer Flag: 1 bit
PV: 16 bits
Timer number: 0 to 4095
Completion Flag: 0 or 1
Timer PV: 0 to 9999 (BCD), 0 to 65535 (binary)
COUNTER Counter Flag: 1 bit
PV: 16 bits
Counter number: 0 to 4095
Completion Flag: 0 or 1
Counter PV: 0 to 9999 (BCD), 0 to 65535 (binary)
FUNCTION
BLOCK
Function block instance --- ---
Array 1-dimensional array; 32,000 elements max.
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