165
Handling Errors and Alarms Section 4-8
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 Output
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 the Unit is restarted, or the Special I/O Unit Restart Bit is turned ON and
then OFF again.
Note Bit 15 is normally turned OFF (i.e., set to 0).
4-8-3 Errors in the CPU Unit
When errors occur in the CPU Unit or I/O bus, and I/O refresh with the Special
I/O Unit is not performed correctly resulting in the Analog Output Unit mal-
functioning, the ERH indicator will be lit.
ERH and RUN Indicators: Lit
RUN
ERC
ERH
ADJ
: Lit
: Flashing
: Not lit
Word n + 9 Alarm flag Error contents Output status Countermeasure
Bit 13 (Adjustment
mode)
Output Number
Setting Error
In adjustment mode, adjust-
ment cannot be performed
because the specified output
number is not set for use or
because the wrong output num-
ber is specified.
The output volt-
age or current
becomes 0 V or
0 mA.
Check whether the word n out-
put number to be adjusted is set
from 11 to 14.
Check whether the output num-
ber to be adjusted is set for use
by means of the DM setting.
Bit 15 only ON (Adjustment
Mode)
PLC Error
The PLC is in either MONITOR
or RUN mode while the Analog
Output Unit is operating in
adjustment mode.
The output volt-
age or current
becomes 0 V or
0 mA.
Detach the Unit. Switch the rear
panel DIP switch pin to OFF.
Restart the Unit in normal mode.
RUN
ERC
ERH
: Lit
: Not lit
Word n + 9 Alarm flag Error contents Countermeasure
Bit 10 Output Hold
Setting Error
The wrong output status for when conver-
sion is stopped has been specified.
Specify a number from 0000 to 0002.
RUN
ERC
ERH
: Lit
: Not lit
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