Mitsubishi QJ71C24N User Manual page 347

11 TROUBLESHOOTING
MELSEC-Q
POINT
• If an error occurs during A compatible 1C frame communications, the Q series C24
adds a 2-character error code (00 to 10 , 42 ) to the "NAK" code and returns the
H H H
"NAK" code to the external device and stores the error code (equivalent to QnA
compatible 2C/3C/4C frame error code) to buffer memory address 25A (CH1) or
H
26A (CH2).
H
The exact error contents can be checked by reading the value stored to the
buffer memory.
See Section 11.2.1 for a detailed description of the error codes.
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