Mitsubishi Electric MELSEC Q Series User Manual page 158

(5) Self-diagnostic function list
The following shows the self-diagnostic functions available during normal operation.
Item
Hardware error
*2
CPU error
RAM check
*3
Fuse blown
I/O module verify error
Intelligent function module
error
Control bus error
Multiple CPU high speed bus
error
Momentary power failure
*2
occurrence
Reduction of redundant base
unit power supply voltage
Redundant power supply
*6
module error
*3
Battery error
Handling error
*3
Module verify
Intelligent function module
assignment error
Intelligent function module
version error
No parameter
Unable to execute instruction
Intelligent program execution
error
156
Error message
MAIN CPU DOWN
RAM ERROR
FUSE BREAK OFF
*2
I/O INT.ERROR
SP.UNIT DOWN
CONTROL-BUS.ERR.
MULTI-C.BUS.ERR.
AC/DC DOWN
SINGLE PS.DOWN
SINGLE PS.ERROR
BATTERY ERROR
UNIT VERIFY ERR.
SP.UNIT LAY ERR.
SP.UNIT VER.ERR.
MISSING PARA.
CAN'T EXE.PRG.
SP.UNIT ERROR
CPU module
Diagnostic timing
status
-
• Any time
• Any time
• Any time
Stop/Continue
• Any time
• At power-on, at reset
• At module access
Stop/Continue
• When interrupt
occurs
• At power-on, at reset
• At module access
• When interrupt
occurs
• Any time
• Any time
• Any time Continue
• Any time Continue
• Any time Continue
• Any time Continue
-
• At power-on, at reset
Stop/Continue
• At power-on, at reset
• At power-on, at reset
• At power-on, at reset
• At power-on, at reset
• Any time
• At power-on, at reset
LED status
*1
RUN
Stop Off
Stop Off
*4
Off/On Flash/On
Stop Off
*5
Off/On Flash/On
Stop Off
Stop Off
On
On
On
On
*4
Off/On Flash/On
Stop Off
Stop Off
Stop Off
Stop Off
Stop Off
ERR.
Flash
Flash
Flash
Flash
Flash
Off
On
On
On
Flash
Flash
Flash
Flash
Flash