Chapter 3: Configuring the 2085-IT8-SC/IT-16-SC Using CCW
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User’s Manual Pub. 0300322-01 Rev. A
Under Range Condition:
If the sampled value is less than or equal to -20 °C, the CJ Sensor reading will be
set to that value (-2000). The CJ Senor Fault bit and the CJ Sensor Under Range
bit will be set in its CJ Sensor Status byte. The CJ compensation profile will use
this value to run compensation.
The bit status and fault will be cleared once this condition no longer exists. The
CJ compensation profile will continue to use the new reading to run
compensation.
Over Range Condition:
If the sampled value is greater than or equal to +90 °C, the CJ Sensor reading
will be set to that value (+9000). The CJ Senor Fault bit and the CJ Sensor Over
Range bit will be set in its CJ Sensor Status byte. The CJ compensation profile
will use this value to run compensation.
The bit status and fault will be cleared once this condition no longer exists. The
CJ compensation profile will continue to use the new reading to run
compensation.
Open Circuit Condition:
If both CJ Sensor connections on the terminal block are open, the default room
temperature value, +25 °C (+2500) will be applied to the CJ Sensor reading. The
CJ Senor Fault bit and the CJ Sensor Open Circuit bit will be set in its CJ Sensor
Status byte. The CJ compensation profile will use this value to run compensation.
If one of the CJ Sensors is open, the other CJ Sensor reading will be used for
both CJ Sensors and that open CJ Sensor Fault bit and the Open Circuit bit will
be set.
Once this condition no longer exists, the CJ sensor will restart to collect 100
samples as the following Data Not Ready condition. The OC bit will be cleared
and the DNR bit will be set instead. The CJ Sensor Fault bit remains set.
Data Not Ready Condition:
Whenever the module is powered up or any of the CJ Sensors is reconnected on
the terminal block, the CJ Sensor needs to collect the initial 100 samples. The CJ
Sensor reading will be set to 0, and the CJ Senor Fault bit and the CJ Sensor
DNR bit will be set in its CJ Sensor Status byte.
After the initial samples are collected, the new CJ Sensor reading will be applied,
and the CJ Sensor Fault bit and the CJ Sensor DNR bit will be cleared. The same
behavior applies to an input channel configured to use thermocouple
measurement with the CJC Profile feature enabled; its status bit indication and
input reading will have the same pattern as the CJ Sensor’s.
•
The update rate on the CJ Sensor reading and its status is about 0.5
seconds.
•
The CJ Sensor reading, and status will remain functioning and reporting,
even if all the input channels are configured to be disabled. This allows
you to use your own ladder to monitor the related CJ Sensor information
and to reconfigure the module to reenable input channels if one of the CJ
sensor fault conditions described above have occurred.
