Omron DRT2 SERIES DEVICENET SLAVES - OPERATION MANUAL 04-2008 Operation Manual page 486

Troubleshooting
Model
Errors occurring in Ana-
log Slaves (Input)
DRT2-AD04
DRT2-AD04H
DRT2-TS04@
Errors occurring in the
DRT2-AD04 Analog
Input Terminal only
Errors occurring in the
DRT2-DA02 Analog
Output Terminal only
Details
The off-wire display will not go
away.
The off-wire display will not
appear.
The Top/Valley Detection Tim-
ing Flag will not go ON.
The Top/Valley Count Over
Flag will not go ON (DRT2-
TS04T only).
The Top/Valley Detection Tim-
ing Flags go ON too frequently.
The Top/Valley count is unex-
pectedly high (DRT2-TS04T
only).
The conversion cycle is too
long.
The expected value is not held
when a communications error
occurs.
Probable cause
The sensor is disconnected.
The cold junction compensa-
tor has been removed (DRT2-
TS04T only).
The temperature is far outside
of the sensor's measurement
temperature range.
The input type is incorrect for
the temperature being mea-
sured.
With Analog Input Terminals,
the off-wire display will not
operate if the input is outside
of the 1 to 5 V range or 4 to 20
mA range.
The hysteresis setting is too
high.
The hysteresis setting is 0.
The hysteresis setting is too
low.
The number of AD conver-
sion points is set to the maxi-
mum (4 points).
The processing time is longer
for each additional function.
The output hold/clear setting
is incorrect.
Section 9-2
Remedy
Fix the sensor disconnection.
Check the connected sensor,
input type setting, and tem-
perature range.
---
Adjust the hysteresis setting.
Adjust the hysteresis setting.
If there are unneeded inputs,
reduce the number of points.
If there are unused functions,
delete those functions.
Check the output hold/clear
setting.
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