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Appendix 3. PLC Development Environment using GPPQ
3.6 PLC-Related Data Development Procedure
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(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 values at the following 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 Max. message length Max. No. of messages
Alarm messages 32 byte 512
Operator messages 60 byte 512
PLC switches 14 byte 32
Comments 60 byte 100
Full-byte data in the message character string is handled as two characters.
(b) When the setting value and message data do not match
When the message data contents (index/switch No. and message character string) overflows
from the settings in the setting area, the data that overflowed is ignored.