Error Processing - Omron CJ Series Operation Manual

3 Isolated-type Universal Input Units

3-2-13 Error Processing

Conversion data does not change.
Probable cause
The gain for span adjustment is set to 0.
The maximum and minimum values set for
process value scaling are identical or
extremely close.
The input type, input range, or process
value scaling is not set correctly.
An input device is malfunctioning or input
wiring is faulty or disconnected.
Values are not converted as intended.
Probable cause
The input type, input range, or process
value scaling is not set correctly.
The zero/span adjustment data is incorrect. Check and correct the zero adjustment value and the span adjustment gain settings.
The platinum resistance thermometer input
wiring is incorrect.
Thermocouple or compensation conductor
polarity is incorrect.
DC input polarity is incorrect.
Potentiometer input wiring is incorrect.
Cold junction compensation is not operat-
ing.
A compensation conductor has not been
used, or the wrong type of compensation
conductor is used.
The offset compensation function is operat-
ing.
The square root calculation is operating.
Conversion values are unstable.
Probable cause
Input signals are being affected by external
noise.
Process values greater than the resolution
are being scaled.
An A/D conversion error occurred.
Probable cause
There is influence from ambient noise.
The ERC indicator is lit.
Probable cause
A setting for a Setting Parameter or the
Expansion Setting Parameters is out of
range.
3-36
Set the gain for span adjustment to a value other than 0.
Set suitable maximum and minimum values for process value scaling.
Check and correct the settings.
Check whether input values have changed. Check for faulty or disconnected wiring. Check
whether an input error has been detected.
Check and correct the settings.
Correct the input wiring.
Check the Cold Junction Error Flag.
Use the correct compensation conductor for the thermocouple.
Set the scaling offset value to an appropriate value.
Disable the square root calculation.
Change the connection paths of the input signal lines. (Separate them from sources of
noise or use shielded twisted-pair cable.)
Increase the number of items for moving average processing.
Set the resolution to 1/256,000 (conversion cycle: 60 ms).
Reduce the process value scaling value.
Install surge suppressors and noise filters for noise-generating devices.
Separate the Unit from the noise source.
Set the value within the optimum range. For Setting Parameter Group 2 or 4 (Initial Set-
tings Parameters), reset the Controller or restart the Unit.
Set even-numbered addresses for the start address of the Expansion Setting Parameters
Area and Expansion Operation Data.
CJ-series Analog I/O Units Operation Manual for NJ-series CPU Unit(W498)
Remedy
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