Conversion Operations; Conv (Convert Value) Instruction - Siemens S7-1200 System Manual

Basic instructions

7.7 Conversion operations

Table 7- 72 Data types for the parameters
Parameter Data type
IN Word, DWord
OUT Word, DWord
Example 1
Address
W#16#1234
WORD
Example 2
Address
DW#16#
12345678
DWORD
7.7 Conversion operations
7.7.1

CONV (Convert value) instruction

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