Omron CRT1 - 10-2008, Operation Manual

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Troubleshooting Section 12-2
Analog I/O Slave
Units (Inputs) The disconnection display
does not clear. • The Sensor is disconnected. • Restore the Sensor connec-
tion.
• Check the connected Sensor
and input type again.
No disconnection display. • Disconnection is not dis-
played for ranges other than 1
to 5 V and 4 to 20 mA.
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The conversion cycle is too
long. • The setting of the number of
AD conversion points is on
the maximum (4 points).
• The processing time gets
longer each time a function is
added.
• Reduce the number of points
if some inputs are unneces-
sary, and execute conversion
again.
• Delete any unused functions,
and execute conversion
again.
Analog I/O Slave
Units (Outputs) The expected value is not held
when communications errors
occur. • The output value that is set
for communications errors is
incorrect.
• Check the output setting for
communications errors.
Temperature Input
Units The 1/100 Display Mode has
been set, but the display reads
0. The allocated word is the one
word in the normal display
area. Either change the default con-
nection path to the 1/100 dis-
play area or select a
connection path in the Master
Unit for the 1/100 display area.
The temperature difference
detected between inputs is not
rising properly. • Data other than the tempera-
ture input value is allocated
for Analog Data 2.
• The temperature difference
display is always a 1/100 dis-
play.
Allocate the temperature input
value for analog data 2.
The temperature range
counter is not counting even
though the temperature value
is set as the count condition. The comparator is not enabled. Enable the comparator. (The
power must be turned OFF
and then ON again.)
The Top/Valley Count Over
Flag will not go ON. • The top/valley hold function is
not enabled.
• Enable the top/valley hold
function. (The power must be
turned OFF and then ON
again.)
• The hysteresis setting is too
high.
• The hysteresis setting is 0.
• Adjust the hysteresis setting.
The comparator does not oper-
ate as expected even though
the function and hysteresis
value have been set. • The temperature display set-
ting has been switched (
°
C to
°
F or vice versa).
Check the decimal point posi-
tion and
°
C/
°
F display for the
input type and display mode.
If these settings have been
changed during operation,
check the comparator and hys-
teresis settings and correct if
necessary.
• The decimal point position-
was read incorrectly.
Model Problem Cause Possible correction