4.A2CCPU
___________________
MELSEC·A
(c) The ERROR LEO is not lit if an error,
for
which
error
indication
priority
order
has not been set, occurs. If all
bits
are
·0'
in
09038
and
09039,
for
example, the ERROR LEO will
not
be lit when any
error of error item numbers
1 to 6 occurs.
In
this
case, however,
the
M9008 (CPU error flag) is set and the
corresponding error
code
is stored in
09008
(CPU
error
register).
(2) Relationship between priority
order
and annunciator resetting
(a) If an annunciator (F[ ]) is turned ON, the
number
of
that
annunciator
is stored in 09009 and 09125 to 09132.
Once the annunciator number is set in
the
registers,
the
number
cannot be reset using
the
RST F[ I or LEOR instruction if an error
for
which higher error indication priority is set than the annunciator
ON.
I
To reset the set annunciator
number
at an occurrence of another
error, set a priority for the annunciator error item number.
4
POINTI
(1) The priority
order
active when the power is turned ON or
the
CPU is
reset becomes effective. Changing
the
priority simply in
the
registers
is ignored unless the CPU is reset or
the
power is turned off once and
then back on again.
(2) Set the error item number set at
09038
or
09039
to 0 so
that
the
ERROR LEO keeps on
turning
off at
the
error occurrence shown in
~
Table 4.7. ,
Example:
The error item setting area of error item
number
4 is set to 0 to keep
the
ERROR LEO turning OFF when an annunciator turns ON.
4-36
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