Mitsubishi QJ71LP21 Reference Manual page 309

8 TROUBLESHOOTING
Error
Code Error Contents and Cause
*1
(SD0)
In a multiple CPU system, the
MELSECNET/H under control of
another CPU is specified as the head
I/O number in the network setting
parameter of the MELSECNET/H.
The network parameters of the
MELSECNET/H operating as a normal
station was changed to the control
station, or the network parameter of
the MELSECNET/H operating as a
control station was changed to a
normal station. (The network
parameter is updated on the module
side by resetting.)
• The number of actually installed
modules is different from that
3100
designated in the number of
modules setting parameter of
MELSECNET/H.
• The head I/O number of actually
installed modules is different from
that designated in the network
parameter of MELSECNET/H.
• Some data in the parameters cannot
be handled.
• The station type of MELSECNET/H
has been changed while the power
is on. (RESET RUN is required to
change the station type.)
Although the QnACPU is a control
station or master station, the network
parameters have not been written.
*1 : Characters in parentheses ( ) indicate the special register numbers where individual information is being
stored.
*12 : This applies to the CPU module of function version B or later.
8 - 98
Corrective Action
• Delete the MELSECNET/H network
parameter of the MELSECNET/H
under control of another CPU.
• Change the setting to the head I/O
number of the MELSECNET/H
under control of the host CPU.
Reset the CPU module.
• Check the network parameters and
actual mounting status, and if they
differ, make them matched.
If any network parameter has been
corrected, write it to the CPU
module.
• Check the extension base unit stage
No. setting.
• Check the connection status of the
extension base units and extension
cables.
When the GOT is bus-connected to
the main base unit and extension
base units, also check the
connection status.
If the error occurs after the above
checks, the possible cause is a
hardware fault. (Contact your local
Mitsubishi representative, explaining a
detailed description of the problem.)
• Correct and write the network
parameters.
• If the error occurs after correction, it
suggests a hardware fault. (Contact
your local Mitsubishi representative.)
MELSEC-Q
Corresponding
CPU
*12
Q00/Q01
*12
Qn(H)
QnPH
*12
Qn(H)
QnPH
QnPRH
QCPU
QnA
8 - 98