6
FUNCTIONS
6.17 Self-diagnostics Function
6
- 133
1
O
verv
iew
2
Per
fo
rma
nce
S
p
ecifica
tio
n
3
S
equ
en
ce P
ro
g
ra
m
Co
nfig
ura
tio
n a
nd
E
xecut
io
n Co
nd
iti
o
ns
4
I/O N
unb
er
Assig
n
m
e
nt
5
Me
mor
ie
s a
nd
File
s
Ha
nd
led
by CP
U Mo
du
le
6
Func
tions
7
Co
mmu
nic
a
tion
us
in
g
bu
ilt
-i
n E
th
e
rne
t po
rt
s o
f
CP
U mod
u
le
8
Co
mm
un
icatio
n
w
ith
Int
e
lli
ge
nt
Fun
ction
Mo
du
le
: Self-diagnostics is performed, : Self-diagnostics is not performed
(Continued on next page)
Table6.35 Self-diagnostics list (Continued)
Diagnosics
Error message
Diagnostics timing
CPU
module
status
LED status
CPU module
RUN
ERR.
1)
2)
3)
4)
5)
Hardware
failure
Intelligent function
module error *
1
SP.UNIT DOWN
• When the CPU
module is powered
on/reset
• When FROM/TO
instruction is
executed
• When intelligent
function module
dedicated instruction
is executed
• When END
instruction is
executed
Stop/
Continue
OFF/ON
Flash/ON
Control bus error
CONTROL-BUS
ERR.
• When the CPU
module is powered
on
• When END
instruction is
executed
• When FROM/TO
instruction is
executed
• When intelligent
function module
dedicated instruction
is executed
• Always
Stop
OFF
Flash
Momentary stop
occurred
AC/DC DOWN
• Always
Continue
ON
OFF
Multiple CPU high
speed bus dedicated
instruction error
MULTI-C.BUS
ERR.
• When the CPU
module is powered
on/reset
Stop
OFF
Flash
Redundant base unit
power supply voltage
drop
SINGLE PS.
DOWN
• Always
Continue
ON
ON
*4
*4
*9
Redundant power
supply module fault
SINGLE PS.
ERROR
• Always
Continue
ON
ON
*4
*4
*9
Battery low
*3
BATTERY ERROR
• Always
Continue
ON
BAT.ALM
LED ON
ROM write count error
FLASH ROM
ERROR
• At ROM write
Continue
ON
ON