Mitsubishi Electric MELSEC iQ-R Series User Manual page 491

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