354
Handling Errors and Alarms Section 7-10
ERC Indicator and RUN Indicator: Lit, ADJ Indicator: Flashing
This alarm will occur in the case of incorrect operation while in the adjustment
mode. In adjustment mode, the Adjustment Mode ON Flag will turn ON in bit
15 of CIO word n+9.
Note When a PLC error occurs in the adjustment mode, Unit operations will stop
operating. (The input and output values immediately prior to the error will be
held.)
ERC Indicator: Lit, RUN Indicator: Not Lit
The ERC indicator will be lit when the initial settings for the Analog I/O Unit
are not set correctly. The alarm flags for the following errors will turn ON in
CIO word n+9. These alarm flags will turn OFF when the error is cleared and
RUN
ERC
ERH
ADJ
: Lit
: Flashing
: Not lit
Word n + 9 Alarm flag Error contents I/O status Countermeasure
Bit 12 (Adjustment
mode)
Input Value
Adjustment
Range
Exceeded
In adjustment mode, offset or
gain cannot be adjusted
because input value is out of the
permissible range for adjust-
ment.
Conversion data
corresponding
to the input sig-
nal is monitored
in word n+8.
If making the adjustment by
means of a connected input
device, first adjust the input
device before adjusting the Ana-
log I/O Unit.
Bit 13 (Adjustment
mode)
I/O Number Set-
ting Error
In adjustment mode, adjust-
ment cannot be performed
because the specified input or
output number is not set for use
or because the wrong input or
output number is specified.
Holds the values
immediately
prior to the error.
No data is
changed.
Check whether the word n input
or output number to be adjusted
is set from 11 to 14, or 21 to 24.
Check whether the input or out-
put number to be adjusted is set
for use by means of the DM set-
ting.
Bit 15 only ON (Adjustment
Mode)
PLC Error
The PLC is in either MONITOR
or RUN mode while the Analog
I/O Unit is operating in adjust-
ment mode.
Holds the values
immediately
prior to the error.
No data is
changed.
Change the setting in bits 00 to
07 of D(m+18) and then either
turn the power supply to the
PLC OFF and ON or turn ON
the Special I/O Unit Restart Bit.
RUN
ERC
ERH
: Lit
: Not li
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