27 TROUBLESHOOTING
27.4 Error Code List
489
27
*1 Error code when the target CPU is MELSEC-A series
7FFCH System error • The operating system of
C24 detected some error.
Page 490 Corrective actions
for system error
7FFDH NULL character
transmission error
• Only NULL character data
was transmitted when
NULL characters
automatic deletion is
designated.
• Review the data to be
transmitted.
7FFFH System error • The operating system of
C24 detected some error.
Page 490 Corrective actions
for system error
Error code
(hexadecima
l)
Error Description Signal
name
Corrective action Protocol
MC Nonpr
ocedu
ral
Bidire
ctiona
l
Prede
fined
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