How the S7-1200 works
4.3 Memory areas, addressing and data types
Easy Book
34
Manual, 05/2009, A5E02486774-01
Data types supported by S7-1200
Data types are used to specify both the size of a
data element as well as how the data are to be
interpreted. Each instruction parameter supports at
least one data type, and some parameters support
multiple data types. Hold the cursor over the
parameter field of an instruction to see which data
types are supported for a given parameter.
Data type
Size (bits)
Range
Examples
Bool
1
0 to 1
TRUE, FALSE, 0, 1
Byte
8
16#00 to 16#FF
16#12, 16#AB
Word
16
16#0000 to 16#FFFF
16#ABCD, 16#0001
DWord
32
16#00000000 to 16#FFFFFFFF
16#02468ACE
Char
8
16#00 to 16#FF
'A', 't', '@'
Sint
8
-128 to 127
123, -123
Int
16
-32,768 to 32,767
123, -123
Dint
32
-2,147,483,648 to 2,147,483,647
123, -123
USInt
8
0 to 255
123
UInt
16
0 to 65,535
123
UDInt
32
0 to 4,294,967,295
123
Real
32
+/-1.18 x 10
-38
to +/-3.40 x 10
38
123.456, -3.4, -1.2E+12, 3.4E-3
LReal
64
+/-2.2250738585072020 × 10
−308
to +/-1.7976931348623157 × 10
308
12345.123456789.
-1.2E+40
Time
32
T#-24d_20h_31m_23s_648ms to
T#24d_20h_31m_23s_647ms
Stored as: -2,147,483,648`ms
to +2,147,483,647 ms
T#5m_30s
5#-2d
T#1d_2h_15m_30x_45ms
String
Variable
0 to 254 byte-size characters
'ABC'
Although not available as data types, the following BCD numeric format is supported by the
conversion instructions.
Format
Size (bits)
Numeric Range
Examples
BCD16
16
-999 to 999
123, -123
BCD32
32
-9999999 to 9999999
1234567, -1234567
