77
Fatal
Errors
Item Cause CPU indicators Peripheral
Device error
Power RUN ERROR WDT ALARM OUT INT COMM message
Power interrup-
tion
Power interruption
occurred and
lasted longer than
the specified limit.
Unlit Unlit Unlit Unlit Unlit Unlit Unlit POWER FAIL
Expansion CPU
Rack power
OFF
Expansion CPU
Rack
Power Supply Unit
is OFF.
Lit Unlit Unlit Unlit Unlit Unlit Unlit POWER FAIL
CPU error Watchdog timer Lit Unlit --- Lit --- --- --- WDT ERR
Memory error Error occurred dur-
ing internal
memory and Ex-
pansion DM verifi-
cation.
Lit Unlit Lit --- --- --- --- MEMORY ERR
I/O bus error Erroneous data
transferred be-
tween CPU and I/O
Units
Lit Unlit Lit --- --- --- --- I/O BUS ERR
Duplicated
number
Rack numbers and
CPU Bus Unit unit
numbers or I/O
words are assigned
in duplicate.
Lit Unlit Lit --- --- --- --- NO DUPL ERR
CPU bus error Error in data trans-
fer between CPU
and CPU Bus Unit
or watchdog timer
error in CPU Bus
Unit.
Lit Unlit Lit --- --- --- --- CPU BUS ERR
I/O points over Too many I/O
points or too many
Units are registered
in the I/O table.
Lit Unlit Lit --- --- --- --- I/O OVER
I/O setting error Input/Output desig-
nation is wrong for
I/O Unit.
Lit Unlit Lit --- --- --- --- I/O SET ERR
Program error END(001) is miss-
ing, or the capacity
of the user memory
is exceeded.
Lit Unlit Lit --- --- --- --- NO END
INSTR
PROGRAM
OVER
Cycle time over Cycle time monitor
time is exceeded.
Lit Unlit Lit --- --- --- --- SCAN TIME
OVER
Fatal SFC error SFC syntax error. Lit Unlit Lit --- --- --- --- SFC ERR
System failure
(FALS)
FALS was ex-
ecuted in program.
Lit Unlit Lit --- --- --- --- SYSTEM FAL
Error Messages and Alarm Outputs Section 5-1
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