Mitsubishi Electric MELSEC Q Series Reference Manual page 327

8 TROUBLESHOOTING
Error
code Error contents and cause
(SD0)
[SINGLE PS. DOWN]
The power supply voltage of either of redundant power
supply modules on the redundant base unit dropped.
Collateral information
1510 • Common Information (SD5 to SD15): Base
No./Power supply No.
• Individual Information (SD16 to SD26): -
Diagnostic Timing
• Always
[SINGLE PS. ERROR]
On the redundant base unit, the one damaged
redundant power supply module was detected.
Collateral information
1520 • Common Information (SD5 to SD15): Base
No./Power supply No.
• Individual Information (SD16 to SD26): -
Diagnostic Timing
• Always
[FLSH ROM ERROR]
The number of writing to flash ROM (error history)
exceeds 100,000 times. (Number of writings > 100,000
times)
1610 Collateral information
• Common Information (SD5 to SD15): -
• Individual Information (SD16 to SD26): -
Diagnostic Timing
• When writing to ROM
[UNIT VERIFY ERR.]
• The I/O module status is different from the I/O
module information at power ON.
• The I/O module (or intelligent function module) is
nearly removed, completely removed, or mounted
during running.
2000
Collateral information
• Common Information (SD5 to SD15): Network
No./Station No.
• Individual Information (SD16 to SD26): -
Diagnostic Timing
• Always
[BASE LAY ERROR]
The QA1S6B or QA6B was used as the base unit.
Collateral information
2011 • Common Information (SD5 to SD15): Base No.
• Individual Information (SD16 to SD26): -
Diagnostic Timing
• At power-on/At reset
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*2
Corrective action
Check the power supplied to the redundant
power supply modules mounted on the
redundant base unit.
The cause is a hardware failure of the
redundant power supply module. (Please
consult your local Mitsubishi representative.)
Change the remote I/O module.
• Read common information of the error
using GX Works2 or GX Developer to
identify the numeric value (module No.).
Check the module corresponding to the
value and replace it as necessary.
• Monitor the special register SD1400 to
SD1431 using GX Works2 or GX
Developer to identify the module whose
data bit is "1". Then check the module and
replace it as necessary.
Do not use the QA1S6B or QA6B as the
base unit.
MELSEC-Q
LED status,
Remote I/O
operation status
REM: Off
ERR: On
Remote I/O status:
Continue
REM: Off
ERR: On
Remote I/O status:
Continue
REM: Off
ERR: On
Remote I/O status:
Continue
REM: Off
ERR: On
Remote I/O status:
Stop/Continue
*1
REM: Off
ERR: On
Remote I/O status:
Stop
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