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MELSEC-Q
8 TROUBLESHOOTING
Error
code
(SD0)
Error contents and cause Corrective action
LED status,
Remote I/O
operation status
2107
[SP.UNIT LAY ERR.]
The start X/Y set in the PLC parameter's I/O
assignment settings is overlapped with the one for
another module.
Collateral information
• Common Information (SD5 to SD15): Module No.
• Individual Information (SD16 to SD26): -
Diagnostic Timing
• At power-on/At reset
*2
Configure the I/O assignment setting of the
PLC parameter again so that it is consistent
with the actual status of the intelligent
function modules and I/O modules.
REM: Off
ERR: On
Remote I/O status:
Stop
2121
[SP.UNIT LAY ERR.]
The CPU module is mounted on the base unit.
Collateral information
• Common Information (SD5 to SD15): Module No.
• Individual Information (SD16 to SD26): -
Diagnostic Timing
• At power-on/At reset
*2
Do not install the remote I/O module and
CPU module in the same system.
REM: Off
ERR: On
Remote I/O status:
Stop
2122
[SP.UNIT LAY ERR.]
The QA1S6
B or QA6
B is used as the main base
unit.
Collateral information
• Common Information (SD5 to SD15): -
• Individual Information (SD16 to SD26): -
Diagnostic Timing
• At power-on/At reset
*2
Replace the main base unit with a usable
one.
REM: Off
ERR: On
Remote I/O status:
Stop
2124
[SP.UNIT LAY ERR.]
• A module is mounted on the 65th slot or later slot.
• A module is mounted on the slot whose number is
greater than the number of slots specified at [Slots] in
[Standard setting] of the base setting.
• A module is mounted on the slot whose number of
I/O points exceeds 4096 points.
• A module is mounted on the slot whose number of
I/O points strides 4096 points.
Collateral information
• Common Information (SD5 to SD15): -
• Individual Information (SD16 to SD26): -
Diagnostic Timing
• At power-on/At reset
*2
• Remove the module mounted on the 65th
slot or later slot.
• Remove the module mounted on the slot
whose number is greater than the number
of slots specified at [Slots] in [Standard
setting] of the base setting.
• Remove the module mounted on the slot
whose number of I/O points exceeds 4096
points.
• Replace the module with the one whose
number of occupied points does not exceed
4096 points.
REM: Off
ERR: On
Remote I/O status:
Stop
2125
[SP.UNIT LAY ERR.]
• A module which the QCPU cannot recognize has
been mounted.
• There was no response from the intelligent function
module.
Collateral information
• Common Information (SD5 to SD15): Module No.
• Individual Information (SD16 to SD26): -
Diagnostic Timing
• At power-on/At reset
*2
• Mount an applicable module.
• The cause is a failure of the intelligent
function module. (Please consult your local
Mitsubishi representative.)
REM: Off
ERR: On
Remote I/O status:
Stop