Mitsubishi Electric MELDAS C6 Programming Manual page 42

1. PLC Development Environment Using GX Developer
(4) Precautions
No. of characters, quantity limitations, handling of information other than settings, handling of
information other than format.
(a) Message data maximum value
Processing will be carried out with the following values considered as the maximum values if the
setting is not carried out in the setting area, or if the description position in the setting area is
illegal.
Message
classification
Alarm messages
Operator messages
PLC switches
Comments
[Note]
Two-byte data in the message character string is handled as two characters.
GX Developer accepts 64 characters as an interlinear comment. However, since that includes
information other than a message character string (e.g. message classification code, index No.
and data register No.), the message character string is actually up to 58 characters long.
(b) When the setting value and message data do not match
When the message data contents (such as index No, switch No. and message character string)
overflows from the settings in the setting area, the data that overflowed is ignored.
1.4 Creating PLC-related Data
Max. message Max. No. of
length messages
32 byte
60 byte
14 byte
60 byte
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512
512
32
100