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Relays, Memory Areas and Constants
1 - 80
1.4.5
Character Constants (M)
Function of character constants (M)
The character constant is used to express ASCII code in binary.
The character constant is expressed by adding the prefix M to the data.
There are only two instructions in which character constants can be specified,
F95
(ASC)
instruction,
F257
to
F265 (SYS1)
instruction and
F149 (MSG)
instruction.
The character constant M is stored in a specified memory area in the PLC as BIN data,
as shown below.
Example:
When character constant “MEWNET” is input
54
45
One word
4E
57
45
4D
T
E
N
W
E
M Character constant
One word One word
ASCII Hex code
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