Mitsubishi Electric MELSEC iQ-RJ71C24-R4 - Page 486

484
27 TROUBLESHOOTING
27.4 Error Code List
7F25H Data length error • The length of the received
data exceeds the receive
area size.
CHn
ERR.
• Correct the "data length" that
is transmitted from the target
device.
• Change the word/byte units
designation to 'byte units'.
• Increase the value for the
receive buffer memory length
designation.

7F26H Command error • Another command was
received before the unlock
processing when the
remote password is
registered.
CHn
ERR.
• Perform data communications
after the unlock processing is
normally completed.

7F30H System error • The operating system of
C24 detected some error.
Page 490 Corrective actions
for system error
7F31H Simultaneous
transmission error
• C24 and the target device
started transmissions
simultaneously.
 • Perform processing according
to the predefined arrangement
with the target device. If
necessary, change the
'simultaneous transmission
data valid/invalid designation'
(Un\G155/315) setting.

7F32H System error • The operating system of
C24 detected some error.
Page 490 Corrective actions
for system error
7F40H Time-out error • No-reception monitoring
time (timer 0) has timed
out.
PRO • Check if any data is missing
due to a data reception error.
• Check if the DTR control, etc.
interrupted data reception.

7F41H Time-out error • Response monitoring time
(timer 1) has timed out.
 • Check the status of the target
device, and restart data
communications, as required.

7F42H Time-out error • Send monitoring time
(timer 2) has timed out.
 • Check if the DTR control, etc.
interrupted data transmission.

7F50H to
7F54H
System error • The operating system of
C24 detected some error.
Page 490 Corrective actions
for system error
7F67H Overrun error • C24 received the next
data before it completed
receive processing of the
previous data.
SIO • Decrease the transmission
speed and restart data
communications.
• Check whether momentary
power failure has occurred on
the station with C24. (can be
checked "AC DOWN counter"
of the special register.)
In case momentary power
failure has occurred, remove
the cause.
• Perform the registration, read,
and delete to/from the flash
ROM while the data
communication is not
performed.

Error code
(hexadecima
l)
Error Description Signal
name
Corrective action Protocol
MC Nonpr
ocedu
ral
Bidire
ctiona
l
Prede
fined