Mitsubishi Electric MELSEC L Series User Manual page 100

Error
code
[SP. UNIT DOWN]
• In the initial processing, no response is returned from the
intelligent function module.
• The buffer memory size of the intelligent function module is
abnormal.
• No response is returned from the intelligent function module.
• When the error occurs, the start I/O number of the
1401
corresponding intelligent function module is stored in the
common information area.
■Supplementary information
• Common information: Module No. (Slot No.)
• Individual information: -
■Diagnostic timing
• When powered on, reset, or accessing an intelligent function
module
[SP. UNIT DOWN]
• No response is returned from the intelligent function module.
• An error occurred in an intelligent function module was
detected.
• Any of the I/O modules (including intelligent function modules)
is being disconnected or was disconnected during the
1403
operation.
■Supplementary information
• Common information: Module No. (Slot No.)
• Individual information: -
■Diagnostic timing
• Any time
[AC/DC DOWN]
• Momentary power failure has occurred.
• The power supply has shut off.
■Supplementary information
1500
• Common information: -
• Individual information: -
■Diagnostic timing
• Any time
[FLASH ROM ERROR]
The number of writes to the flash ROM has exceeded 100000.
(Number of writes > 100000)
■Supplementary information
1610
• Common information: -
• Individual information: -
■Diagnostic timing
• When writing data to ROM
[BUS TIMEOUT ERR.]
An error was detected on the system bus.
■Supplementary information
• Common information: -
1700
• Individual information: -
■Diagnostic timing
• Any time
[UNIT BUS ERROR]
• An error was detected on the system bus.
• An error was detected in the installed module.
■Supplementary information
1710
• Common information: -
• Individual information: -
■Diagnostic timing
• Any time
98
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Error and cause
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Reset the head module.
If the same error code is displayed again, the possible cause is a hardware
failure of the head module, I/O module, intelligent function module, or END
cover. (Please consult your local Mitsubishi representative.)
Reset the head module.
If the same error code is displayed again, the possible cause is a hardware
failure of the head module, I/O module, intelligent function module, or END
cover. (Please consult your local Mitsubishi representative.)
Check the power supply status.
• Replace the head module.
• In "Communication Head Setting" of PLC parameter, clear the checkbox so
that data of the error history and system error history will not be held when the
system is powered off or the head module is reset.
Reset the head module.
If the same error code is displayed again, the possible cause is a hardware
failure of the head module, I/O module, intelligent function module, or END
cover. (Please consult your local Mitsubishi representative.)
Action