Omron GRT1 - 11-2007 Operation Manual page 320

Troubleshooting by Unit
Model
Analog Input Unit Disconnection is not indi-
cated.
GRT1-AD2
The Top/Valley Detection Tim-
ing Flags do not turn ON.
The Top/Valley Detection Tim-
ing Flags turn ON frequently.
The conversion cycle is long.
Analog Output Units The expected value is not
held when a communications
GRT1-DA2V
error or slice bus error occurs.
GRT1-DA2C
Temperature Input Unit Status does not turn ON even
(GRT1-TS2@) if the monitoring set value is
exceeded.
• The expected temperature
• Unit does not operate as
Details
input value cannot be
achieved even if the input
type, display mode, and units
are changed.
expected even if the data
allocated to the I/O, or the
function enable bit is
changed.
Probable cause
The input range is not set to
1 to 5 V or 4 to 20 mA. Dis-
connection cannot be indi-
cated if the ranges are not 1
to 5 V or 4 to 20 mA.
The hysteresis value is too
large for the amount of input
change.
The hysteresis is 0.
The top/valley function is not
enabled.
The hysteresis value is too
small for the amount of input
change.
Many processing functions
are being used. Processing
time is increased each with
each additional function.
Output value settings at
communications errors are
incorrect.
• Relevant function is not
enabled.
• Status turns OFF regard-
less of other conditions
when monitoring set value
is 0.
• Monitoring set value was
set with an incorrect num-
ber of decimal places.
• The change will not be
reflected unless the Unit's
power supply is turned OFF
and then ON or the Config-
urator is reset after the
change.
Section 9-5
Remedy
Check whether the input ranges
are correct.
Decrease the value by matching
the absolute value of hysteresis to
the amount of change in input.
Set the hysteresis to a value other
than 0.
Enable the top/valley function.
(After making the setting, reset
the Unit using the Configurator or
to turn the Unit's power OFF and
ON.)
Increase the value by matching
the absolute value of hysteresis to
the amount of change in input.
Disable any unused functions and
execute conversion.
Check the details of the output
value settings at errors again.
• Enable the corresponding func-
tion.
• Set the monitoring set value to a
value other than 0.
• Check the number of decimal
places and reset the set value.
• Turn power supply OFF and
then ON or reset the Configura-
tor.
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