Mitsubishi Electric MELSEC-L SSCNETIII/H User Manual page 96

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.
• A module which is not supported is connected.
• 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 during its operation, or was
1403
disconnected.
■Supplementary information
• Common information: Module No. (Slot No.)
• Individual information: 
■Diagnostic timing
• Any time
[AC/DC DOWN]
• Momentary supply power failure occurred.
• The supply power turned off.
■Supplementary information
1500
• Common information: 
• Individual information: 
■Diagnostic timing
• Any time
[FLASH ROM ERROR]
The number of writes to the flash ROM exceeded 100,000 times.
(Number of writes > 100,000)
■Supplementary information
1610
• Common information: 
• Individual information: 
■Diagnostic timing
• When writing data to ROM
[BUS TIMEOUT ERR.]
Failure of the system bus was detected.
■Supplementary information
• Common information: 
1700
• Individual information: 
■Diagnostic timing
• Any time
[UNIT BUS ERROR]
• Failure of the system bus was detected.
• Failure of a connected module was detected.
■Supplementary information
1710
• Common information: 
• Individual information: 
■Diagnostic timing
• Any time
94
Error and cause
When a module which is not supported is connected, disconnect the module.
When the connected module is supported, 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.)
When a module which is not supported is connected, disconnect the module.
When the connected module is supported, 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.)
Check the supply power.
• Replace the head module.
• In "Communication Head Setting" of PLC Parameter, clear the check box so
that data of the error history and system error history will not be held at the
time of power off or reset.
Reset the head module.
If this error occurs again, this module, I/O module, intelligent function module, or
END cover may be faulty. (Please consult your local Mitsubishi representative.)
Action