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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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