Mitsubishi MELSEC LJ71C24, User Manual

Page: 131 / 428

9 - 21 9 - 21
9 DATA COMMUNICATION USING THE PREDEFINED PROTOCOL
POINT
An error may occur in any of the following cases.
y When "Conversion" is "ASCII Hexadecimal HEX", an ASCII BIN conversion
error (7F20
H
) may occur if a string except for '0'-'9' 'A'-'F' 'a'-'f' is received.
y When "Conversion" is "ASCII Decimal HEX", an ASCII BIN conversion error
(7F20
H
) may occur if a string except for '0'-'9' is received. However, the following
are exempt from the ASCII BIN conversion error.
Item C24 operation
Sign/Sign
Character
When "Signed" is selected, a sign character can be received.
However, an ASCII BIN conversion error (7F20
H
) may occur when a
sign character which is not at the beginning of a unit of data is received.
Number of
Decimals
When any other than "No decimal point" is selected, '. ' (a period) can be
received.
However an ASCII BIN conversion error (7F20
H
) may occur when '. '
(a period) which is not at the specified digit is received.
An ASCII BIN conversion error (7F20
H
) may also occur when
"variable point" is selected and '. ' (a period) which is at the beginning or
end of a unit of data is received.
Delimiter
When any other than "No delimiter" is selected, a delimiter can be
received.
However an ASCII BIN conversion error (7F20
H
) may occur when a
delimiter which is not at a boundary of data is received.
y When "Number of Digits of Data" is "Variable Number of Digits", an invalid
number of digits error (7D19
H
) may occur if the number of digits of receive data
exceeds the upper limit shown below.
Conversion unit Conversion
Upper limit of the number of
the receive data
ASCII decimal HEX Maximum 5 digits
Word
ASCII hexadecimal HEX Maximum 4 digits
ASCII decimal HEX Maximum 10 digits
Double word
ASCII hexadecimal HEX Maximum 8 digits
y When "Number of Decimals" is 'Variable Point' in a send packet, a decimal point
position designation error (7D21
H
) may occur if the decimal point position is
greater than the number of digits.