219
Handling Errors and Alarms Section 5-8
5-8-4 Restarting Special I/O Units
There are two ways to restart Special I/O Unit operation after having changed
DM contents or having cleared the cause of an error. The first way is to turn
the power to the PLC OFF and ON, and the second way is to turn the Special
I/O Unit Restart Bit ON and then OFF again.
Special I/O Unit Restart Bits
The output becomes 0 V or 0 mA during restart.
If the error is not cleared even after turning the Special I/O Unit Restart Bit ON
and then OFF again, then replace the Unit.
5-8-5 Troubleshooting
The following tables explain the probable causes of troubles that may occur,
and the countermeasures for dealing with them.
Analog Output Does Not Change
Output Does Not Change as Intended
Outputs are Inconsistent
Bits Functions
A50200 Unit #0 Restart Bit Turning the Restart Bit for any
Unit ON and then OFF again
restarts that Unit.
A50201 Unit #1 Restart Bit
~~
A50215 Unit #15 Restart Bit
A50300 Unit #16 Restart Bit
~~
A50715 Unit #95 Restart Bit
Probable Cause Countermeasure Page
The output is not set for being used. Set the output for being used. 196
The output hold function is in opera-
tion.
Turn ON the Output Conversion
Enable Bit.
200
The conversion value is set outside
of the permissible range.
Set the data within the range. 172
Probable Cause Countermeasure Page
The output signal range setting is
wrong.
Correct the output signal range set-
ting.
197
The specifications of the output
device do not match those of the
Analog Output Unit (e.g., input sig-
nal range, input impedance).
Change the output device. 171
The offset or gain is not adjusted. Adjust the offset or gain. 204
Probable Cause Countermeasure Page
The output signals are being
affected by external noise.
Try changing the shielded cable
connection (e.g., the grounding at
the output device).
187
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