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Error
Error and cause
code
[END COVER ERR.]
Failure of the END cover was detected.
■Supplementary information
1720
• Common information:
• Individual information:
■Diagnostic timing
• When powered on or reset
[SYSTEM RST ERR.]
Failure of the system bus was detected.
■Supplementary information
1730
• Common information:
• Individual information:
■Diagnostic timing
• When powered on or reset
[NO END COVER]
There is no END cover.
■Supplementary information
• Common information:
2030
• Individual information:
■Diagnostic timing
• When powered on or reset
[NO END COVER]
There is no END cover.
■Supplementary information
• Common information:
2031
• Individual information:
■Diagnostic timing
• Any time
[UNIT BAD CONNECT]
• The information is different from the I/O module information at
the time of power on.
• Any of the I/O modules (including intelligent function modules)
is being disconnected during its operation, or was
2040
disconnected.
■Supplementary information
• Common information: Module No. (Slot No.)
• Individual information:
■Diagnostic timing
• Any time
[SP. UNIT LAY ERR.]
• In "I/O Assignment" of PLC Parameter, "Intelligent" is set for
the position of an I/O module. Or vice versa.
• In "I/O Assignment" of PLC Parameter, the intelligent function
module switch setting is set for the module that does not
support it.
• In "I/O Assignment" of PLC Parameter, the number of points
2100
smaller than that of the actual intelligent function module is
assigned.
■Supplementary information
• Common information: Module No. (Slot No.)
• Individual information:
■Diagnostic timing
• When powered on or reset
[SP. UNIT LAY ERR.]
A start X/Y set in "I/O Assignment" of PLC Parameter is
overlapped with that of another module.
■Supplementary information
2107
• Common information: Module No. (Slot No.)
• Individual information:
■Diagnostic timing
• When powered on or reset
• Replace the END cover.
• Reset the head module.
If this error occurs again, the hardware of the head module, intelligent function
module, or END cover may be faulty. (Please consult your local Mitsubishi
representative.)
• Install an END cover.
• Check if the modules are correctly connected, referring to the configuration of
the modules in the System Monitor dialog box.
• Reset the head module.
If this error occurs again, the hardware of the head module, I/O module,
intelligent function module, or END cover may be faulty. (Please consult your
local Mitsubishi representative.)
• Read common information on the error using GX Works2, check the module
corresponding to the value (module No.), and replace the module.
• Monitor SD1400 to SD1431 on GX Works2, check the module corresponding
to the bit indicating "1", and replace the module.
• Reset the head module.
If this error occurs again, the hardware of the head module, I/O module,
intelligent function module, or END cover may be faulty. (Please consult your
local Mitsubishi representative.)
• Correct the I/O Assignment setting of PLC Parameter, according to the actual
condition of the intelligent function module(s) and head module.
• In "I/O Assignment" of PLC Parameter, delete the intelligent function module
switch settings.
Correct the I/O Assignment setting of PLC Parameter, according to the actual
condition of the intelligent function module(s) and I/O module(s).
CHAPTER 11 TROUBLESHOOTING
Action
11
95
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Table of Contents
Troubleshooting
