Delta AH Series Operation Manual page 255

Error Code Description
The remote device involved in the
data exchange does not respond
16#6501
after the timeout period.
(SM828~SM955)
The remote device involved in the
data exchange does not respond
16#6502
correctly. (SM828~SM955)
MODBUS TCP data exchange
16#6700
initialization error
MODBUS TCP data exchange
16#6701
timeout
MODBUS TCP data receiving error
16#6702
This function is not available for
16#7002
CPU modules.
Invalid access code
16#7203
Function code error
16#7401
The packet exceeds the max. data
16#7402
length.
Non-ASCII characters exist in the
16#7407
command.
PLC is in RUN mode
16#7408
The CPU memory is being written
16#740A
or failed to be written.
The Clear or Reset operation is in
16#740B
progress.
The backplane number in a
16#740C
communication command is
incorrect.
The slot number in a
16#740D
communication command is
incorrect.
Error occurs when clearing the
16#740E
memory
Ch a pt er 9 T r o u bl es h oo t in g
Corrective action
Check the device whose connection number corresponds to
the error flag, and check whether it is connected normally.
Check the device whose connection number corresponds to
the error flag, and check whether it is connected normally.
Check the setting value and download the data again.
Confirm if the device to be connected supports MODBUS
communication protocol.
Confirm if the device to be connected supports MODBUS
communication protocol.
Check the CPU firmware version.
Check the content of the packet sent by the device to be
connected.
Check the content of the packet sent by the device to be
connected.
Check the content of the packet sent by the device to be
connected.
Check the content of the packet sent by the device to be
connected.
Data download for program or CPU parameters is not allowed
when PLC is in RUN mode.
Flash/SD card is being written. Please try again later.
The RST/CLR operation is in progress. Please try again later.
Please check the PLC firmware and the software version and
contact the supplier.
Please check the PLC firmware and the software version and
contact the supplier.
Please try again. If the error occurs again, contact the
supplier.
9_
9 - 6 1