Rockwell Automation 1746-INT4 Thermocouple/MV Isolated/ User Manual - Manual (Page 56)

Publication 1746-UM614B-EN-P - September 2007
56 Channel Configuration, Data, and Status
Out-of-range Detection (Bit 13 for under-range, bit 14 for over-range)
The module tests all enabled channels for an out-of-range condition
each time it scans its inputs. Possible causes of an out-of-range
condition include:
•
the temperature is too hot or too cold for the thermocouple
being used.
•
a type B, C, or D thermocouple may be registering a °F value in
EU x1 beyond the range allowed by the SLC processor (beyond
32,767) for the data word.
•
a CJC thermistor may be damaged or the temperature within the
cabinet containing the module may be outside the CJC
thermistor range limits.
Invalid Channel Configuration (Bit 15)
The module sets this fault bit when it detects the following invalid
configurations:
•
Configuration bits 0…3: invalid input type = 1 1 0 0 , or 1 1 0 1,
or 1 1 1 0
•
Configuration bits 6…7: invalid code for open circuit mode = 1 1
•
Configuration bits 9…10, and 12…15: invalid non-zero bit
setting