8 TROUBLESHOOTING
MELSEC-Q
8 - 78 8 - 78
*1 : Characters in parentheses ( ) indicate the special register numbers where individual information is being
stored.
*13: This applies to the CPU module of function version A.
Error
Code
(SD0)
*1
Error Contents and Cause Corrective Action
Corresponding
CPU
2120
The location of Q B and QA1S B is
improper.
Check the location of the base unit.
Q00J/Q00/
Q01
*13
Qn(H)
QnPH
2121
The CPU module is installed to other
than the CPU slot and slots 0 to 2.
Check the loading position of the CPU
module and reinstall it at the correct
slot.
Qn(H)
QnPH
Rem
2122
QA1S B is used to the main base
unit.
Replace the main base unit with a
usable one.
Qn(H)
QnPH
QnPRH
Rem
2124
• A module is installed to the 65th or
higher slot.
• A module is installed to the slot
whose number is greater than the
number of slots specified in the base
setting.
• A module is installed to the location
corresponding to the I/O points of
the 4,096 or greater.
• A module is installed to the slot
whose assigned I/O range inclds the
limit of.
• Remove the module installed to the
65th or later slot.
• Remove the module installed at the
slot whose number is greater than
the number of slots specified in the
base setting.
• Remove the module installed to the
location of I/O points, 4,096 or
greater.
• Replace the last module to a module
which does not exceed the 4,096th
point.
Q00J/Q00/Q01
Rem
• A module is mounted on the 25th or
higher slot. (17th or higher slots for
the Q00J)
• A module is mounted on the slot
higher than the number specified
with base allocation setting.
• A module is mounted on the I/O
points higher than the 1024th point.
(256th or higher points for the Q00J)
• A module is mounted on the 1024th
or higher points. (256th or higher
points for the Q00J)
• Remove the module mounted on the
25th or higher slot. (17th or higher
slots for the Q00J)
• Remove the module mounted on the
slot higher than the number
specified with base allocation
setting.
• Remove the module mounted on the
I/O points higher than the 1024th
point. (256th or higher points for the
Q00J)
• Change the last module with the one
which does not exceed the 1024th
point. (256th or lower points for the
Q00J)
Q00J/Q00/Q01
Rem
5 or more extension base units were
added. (3 bases for Q00J)
Remove 5 or more extension base
units. (3 bases for Q00J)
Q00J/Q00/
Q01
*13
Rem
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