73
Handling Errors and Alarms Section 2-8
CIO word. 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 These alarms are output in CIO word n+9 for CS1W-AD041-V1 and CS1W-
AD081-V1, and in CIO word n+19 for CS1W-AD161.
2-8-3 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 Input Unit malfunc-
tioning, the ERH indicator will be lit.
ERH and RUN Indicators: Lit
The ERH and RUN indicators will be lit if an error occurs in the I/O bus caus-
ing a WDT (watchdog timer) error in the CPU Unit, resulting in incorrect I/O
refresh with the Analog Input Unit.
Turn ON the power supply again or restart the system.
For further details, refer to CS-series CS1G/H-CPU@@-EV1, CS1G/H-
CPU@@H Programmable Controllers Operation Manual (W339).
Note No error will be detected by the CPU Unit or displayed on the Programming
Console, because the CPU Unit is continuing operation.
ERH Indicator: Lit, RUN Indicator: Not Lit
Word n+9/n+19
(See note.)
Alarm flag Error contents Input status Countermeasure
Bit 11 Mean Value
Processing Set-
ting Error
The wrong number of samplings
has been specified for mean
processing.
Conversion
does not start
and data
becomes 0000.
Specify a number from 0000 to
0006.
Bit 12 Conversion
Time/Operation
Mode Setting
Error
The setting for conversion time/
resolution is incorrect.
Conversion
does not start
and data
becomes 0000.
Specify 00 or C1.
RUN
ERC
ERH
: Lit
: Not lit
Error Error contents Input status
I/O bus error Error has occurred during data
exchange with the CPU Unit.
Conversion data becomes 0000.
CPU Unit monitoring error (see
note)
No response from CPU Unit dur-
ing fixed period.
Maintains the condition existing
before the error.
CPU Unit WDT error Error has been generated in
CPU Unit.
Changes to undefined state.
RUN
ERC
ERH
: Lit
: Not lit
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