Mitsubishi Electric MELSEC Q Series Reference Manual page 326

8 TROUBLESHOOTING
Error
code Error contents and cause
(SD0)
[SP.UNIT DOWN]
• There was no response from the intelligent function
module in the initial processing.
• The size of the buffer memory of the intelligent
function module is invalid.
• The unsupported module is mounted.
1401
Collateral information
• Common Information (SD5 to SD15): Module No.
• Individual Information (SD16 to SD26): -
Diagnostic Timing
• At power-on/At reset*2/When intelligent function
module is accessed
[SP.UNIT DOWN]
• There was no response from the intelligent function
module.
• An error is detected at the intelligent function module.
• The I/O module (intelligent function module) is nearly
removed, completely removed, or mounted during
1403
running.
Collateral information
• Common Information (SD5 to SD15): Module No.
• Individual Information (SD16 to SD26): -
Diagnostic Timing
• Always
[CONTROL-BUS.ERR.]
An error is detected on the system bus.
• Self-diagnostic error in the system bus
• Self-diagnostic error in the remote I/O module
1413
Collateral information
• Common Information (SD5 to SD15): -
• Individual Information (SD16 to SD26): -
Diagnostic Timing
• Always
[CONTROL-BUS.ERR.]
An error is detected on the system bus.
Collateral information
1414 • Common Information (SD5 to SD15): Module No.
• Individual Information (SD16 to SD26): -
Diagnostic Timing
• Always
[CONTROL-BUS.ERR.]
Fault of the main or extension base unit was detected.
Collateral information
• Common Information (SD5 to SD15): Base No.
1415
• Individual Information (SD16 to SD26): -
Diagnostic Timing
• Always
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Corrective action
If an unsupported module is mounted,
remove it. When only supported modules are
mounted, the cause is a hardware failure of
the intelligent function module, remote I/O
module, or base unit. (Please consult your
local Mitsubishi representative.)
The cause is a failure of the remote I/O
module, base unit, or intelligent function
module in the access destination. (Please
consult your local Mitsubishi representative.)
Reset the remote I/O module. If the same
error code is displayed again, the cause is a
failure of the intelligent function module,
remote I/O module, or base unit. (Please
consult your local Mitsubishi representative.)
Reset the remote I/O module. If the same
error code is displayed again, the cause is a
failure of the intelligent function module,
remote I/O module, or base unit. (Please
consult your local Mitsubishi representative.)
Reset the remote I/O module. If the same
error code is displayed again, the cause is a
failure of the intelligent function module,
remote I/O module, or base unit. (Please
consult your local Mitsubishi representative.)
MELSEC-Q
LED status,
Remote I/O
operation status
REM: Off
ERR: On
Remote I/O status:
Stop/Continue *1
REM: Off
ERR: On
Remote I/O status:
Stop/Continue
*1
REM: Off
ERR: On
Remote I/O status:
Stop
REM: Off
ERR: On
Remote I/O status:
Stop
REM: Off
ERR: On
Remote I/O status:
Stop
8 - 46