316
Troubleshooting
Section 8-2
DRT1-AD04H
8-2-3
Temperature Input Terminal Troubleshooting
Use the following table to troubleshoot problems in the Temperature Input Ter-
minal.
8-2-4
C200H I/O Link Unit Troubleshooting
When an error occurs in the C200H I/O Link Unit and the error code is dis-
played by the 7-segment display, use the following table to troubleshoot the
problem. If the error code is not shown on the 7-segment display, use the
table under the heading
Identifying Errors from Symptoms
to troubleshoot the
problem.
Identifying Errors from Seven-segment Display
Error
Probable cause
The AD converted data is 7FFF when the
disconnection indicator is lit.
The Analog Input Terminal’s open-circuit detection function is activated
when the input range is set to 1 to 5 V and the voltage drops below 0.8 V or
the input range is set to 4 to 20 mA and the current drops below 3.2 mA.
The converted data is set to FFFF when the open-circuit detection function
is activated. The disconnection indicator will be lit at the same time.
Check the Analog input’s cables for broken wires or incorrect wiring.
When the input signal rises above 0.8 V or 3.2 mA, the converted data will
automatically return to its normal range. The disconnection indicator will go
out at the same time.
Error
Probable cause
The temperature data is 7FFF when the dis-
connection indicator is lit.
Check the temperature sensor cables for broken wires or incorrect wiring.
Check that input cables are wired properly.
Check that the cold junction compensator is connected properly
(applicable to the DRT1-TS04T only).
Display
Probable cause
Possible remedy
C0
Attempt was made to set the Link Area when the
PLC is not in PROGRAM mode.
1.Turn OFF bit 00 of the software switches.
2.Switch the PLC’s operating mode to PROGRAM mode.
3.Turn ON bit 00 of the software switches again.
C3
Invalid setting values in Link Area.
1.Turn OFF bit 00 of the software switches.
2.Check the area settings, address settings, and size
settings, and correct if necessary.
3.Turn ON bit 00 of the software switches again.
D9
Timeout error in communications with Master
Unit.
• The Master Unit is not operating.
• The cables are not connected properly.
• A source of noise is close to the Master Unit.
1.Check the status of the Master Unit.
2.Check that the DeviceNet communications cables are
connected properly and that noise preventative mea-
sures have been taken.
3.If the error is not cleared after taking the above steps,
restart the Unit.
E0
The Network’s communications power is not
being supplied normally.
Check the Network’s power supply and wiring, and restart
the Unit.
E4
The Unit’s Read/Write Area is set to default set-
tings with other Communications Units con-
nected.
1.Check that the area address settings for the SYSMAC
BUS Masters, DeviceNet Masters, and DeviceNet
Slaves are not overlapping.
2.Set the Read/Write Area settings using bit 00 of the soft-
ware switches. (If the settings are overlapping intention-
ally, the Unit will operate according to the Read/Write
Area settings after setting this bit.)
3.Restart the Unit.
E6
The CPU Unit is mounted to a C200H or
C200HS PLC.
Remount the CPU Unit to a C200HE, C200HG, or
C200HX PLC, and restart the PLC.
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