Siemens S7-1200 - Conversion Operations; CONV (Convert Value) Instruction

Basic instructions
7.7 Conversion operations
S7-1200 Programmable controller
244 System Manual, 03/2014, A5E02486680-AG
Table 7- 72 Data types for the parameters
Parameter
Data type
Description
IN
Word, DWord
Ordered data bytes IN
OUT
Word, DWord
Reverse ordered data bytes OUT
Example 1
Parameter IN = MB0
(before execution)
Parameter OUT = MB4,
(after execution)
Address
MW0
MB1
MW4
MB5
W#16#1234
WORD
12
MSB
34
LSB
34
MSB
12
LSB
Example 2
Parameter IN = MB0
(before execution)
Parameter OUT = MB4,
(after execution)
Address
MD0
MB1
MB2
MB3
MD4
MB5
MB6
MB7
DW#16#
12345678
DWORD
12
MSB
34
56
78
LSB
78
MSB
56
34
12
LSB
7.7
Conversion operations
7.7.1
CONV (Convert value) instruction
Table 7- 73 Convert (CONV) instruction
LAD / FBD
SCL
Description
out := <data type in>_TO_<data type out>(in);
Converts a data element from one
data type to another data type.
1
For LAD and FBD: Click the "???" and select the data types from the drop-down menu.
2
For SCL: Construct the conversion instruction by identifying the data type for the input parameter (in) and output
parameter (out). For example, DWORD_TO_REAL converts a DWord value to a Real value.